10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File No. 001-38359

Adicet Bio, Inc.

(Exact name of registrant as specified in its charter)

Delaware	81-3305277
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
500 Boylston Street, 13th Floor Boston, MA	02116
(Address of principal executive offices)	(Zip Code)

(857) 315-5528

(Registrant’s telephone number, including area code)  

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	ACET	The Nasdaq Global Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒    No ☐  

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐	Smaller reporting company	☒
		Emerging growth Company	☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

As of November 3, 2020, the registrant had 19,600,567 shares of common stock, $0.0001 par value per share, outstanding.

Table of Contents

		Page
EXPLANATORY NOTE		2
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS		3
PART I.	FINANCIAL INFORMATION	4
Item 1.	Condensed Consolidated Financial Statements (Unaudited)	4
	Condensed Consolidated Balance Sheets as of September 30, 2020 and December 31, 2019	4
	Condensed Consolidated Statements of Operations and Comprehensive Loss for the three and nine months ended September 30, 2020 and 2019	5
	Condensed Consolidated Statement of Stockholders’ Equity for the three and nine months ended September 30, 2020	6
	Condensed Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) for the three and nine months ended September 30, 2019	7
	Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2020 and 2019	8
	Notes to Unaudited Condensed Consolidated Financial Statements	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	44
Item 4.	Controls and Procedures	44
PART II.	OTHER INFORMATION	46
Item 1.	Legal Proceedings	46
Item 1A.	Risk Factors	46
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	84
Item 3.	Defaults Upon Senior Securities	84
Item 4.	Mine Safety Disclosures	84
Item 5.	Other Information	84
Item 6.	Exhibits	84
Signatures		87

i

Summary of the Material Risks Associated with Our Business

• Our product candidates are based on novel technologies, which makes it difficult to predict the likely success of such product candidates and the time and cost of product candidate development and obtaining regulatory approval. Specifically, our gamma delta T cell candidates represent a novel approach to cancer treatment that creates significant challenges for us.

• Our business is highly dependent on the success of ADI-001 and ADI-002. If we are unable to obtain approval for ADI-001 or ADI-002 and effectively commercialize ADI-001 or ADI-002 for the treatment of patients in our approved indications, our business would be significantly harmed.

• All of our product candidates, including ADI-001 and ADI-002, will require additional clinical and non-clinical development and will require substantial investment. If we are unable to raise sufficient capital when needed, our business, financial condition and results of operations will be harmed, and we will need to significantly modify our operational plans to continue as a going concern.

• Our clinical trials may fail to demonstrate the safety and efficacy of any of our product candidates, which would prevent or delay regulatory approval and commercialization.

• We may encounter substantial delays in our clinical trials, or may not be able to conduct our trials on the timelines we expect.

• A variety of risks associated with conducting research and clinical trials abroad and marketing our product candidates internationally could materially adversely affect our business.

• A pandemic, epidemic or outbreak of an infectious disease, such as COVID-19, may materially and adversely affect our business and operations.

• We have identified material weaknesses in our internal control over financial reporting. Failure to achieve and maintain effective internal control over financial reporting could harm our business and negatively impact the value of our common stock.

• We may form or seek strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of such alliances or licensing arrangements.

• If our collaboration agreement with Regeneron is terminated, or if Regeneron materially breaches our obligations thereunder, our business, prospects, operating results, and financial condition would be materially harmed.

• We are subject to certain exclusivity obligations under our agreement with Regeneron.

• The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates.

• We depend on intellectual property licensed from third parties and termination of any of these licenses could result in the loss of significant rights, which would harm our business.

• We currently have no marketing and sales organization and as a company has no experience in marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, we may not be able to generate product revenue.

• We do not currently operate our own manufacturing facility, which would require significant resources and any failure to successful manufacture our products could adversely affect our clinical trials and the commercial viability of our product candidates.

1

EXPLANATORY NOTE

Prior to September 15, 2020, we were a clinical-stage biopharmaceutical company known as resTORbio, Inc. (“resTORbio”) that had historically focused on developing innovative medicines that target the biology of aging, to prevent or treat age-related diseases with the potential to extend healthy lifespans. resTORbio was originally incorporated under the laws of the State of Delaware in July 2016 and commenced research and development operations in March 2017.

On September 15, 2020, we completed our business combination whereby a wholly-owned subsidiary of resTORbio merged with and into Adicet Bio, Inc. (“Former Adicet”), with Former Adicet surviving as a wholly-owned subsidiary of resTORbio and changing its name to Adicet Therapeutics, Inc. (such transactions, the “Merger”). In connection with the completion of the Merger, resTORbio was renamed Adicet Bio, Inc. (“Adicet Bio”).

Immediately prior to the effective time of the Merger, resTORbio effected a reverse stock split of its common stock at a ratio of 1-for-7 (the “Reverse Stock Split”). At the effective time of the Merger, each outstanding share of Former Adicet’s capital stock was converted into the right to receive 0.1240 (the “Exchange Ratio”) shares of Adicet Bio’s common stock.

Unless otherwise noted, all references to common stock share and per share amounts in this Quarterly Report on Form 10-Q have been retroactively adjusted to reflect the conversion of shares in the Merger based on the Exchange Ratio and Reverse Stock Split. As used herein, the words “the Company,” “we,” “us,” and “our” refer to, for periods following the Merger, Adicet Bio (formerly resTORbio, Inc.), together with is direct and indirect subsidiaries, and for periods prior to the Merger, Adicet Therapeutics, Inc. (formerly Adicet Bio, Inc.), and its direct and indirect subsidiaries, as applicable.  In addition, the word “resTORbio” refers to the Company prior to the completion of the Merger, and we sometimes refer to Adicet Therapeutics, Inc. as “Adicet” or “Former Adicet.”

2

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, contained in this Quarterly Report on Form 10-Q, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans and objectives of management and expected market growth are forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.

These forward-looking statements include, among other things, statements about:

• the anticipated timing of our initiation of future clinical trials for ADI-001 in non-Hodgkin’s Lymphoma (“NHL”), including the anticipated results;

• the anticipated timing of our submission of INDs or equivalent regulatory filings and initiation of future clinical trials for ADI-002 in solid tumors, including the timing of the anticipated results;

• the impacts of the current COVID-19 pandemic on our continuing operations, clinical development plans, including the timing of initiation and completion of studies or trials, financial forecasts and expectations, potential delays and increased costs in conducting clinical trials in nursing homes, and other matters related to our business and operations;

• the timing of and our ability to obtain and maintain regulatory approvals for our product candidates;

• the rate and degree of acceptance and clinical utility of any products for which we receive regulatory approval;

• our commercialization, marketing and manufacturing capabilities and strategy;

• our intellectual property position and strategy;

• our ability to identify additional product candidates with significant commercial potential;

• our plans to enter into collaborations for the development and commercialization of product candidates;

• the potential benefits of any future collaboration;

• our ability to contract with third party suppliers and manufacturers and their ability to perform adequately;

• the success of competing therapies that are or may become available;

• our ability to retain the continued service of our key professionals and to identify, hire, and retain additional qualified professionals;

• our financial performance;

• our expectations related to the use of cash, cash equivalents and marketable securities;

• our estimates regarding expenses, future revenue, capital requirements and needs for additional financing;

• our ability to remediate the material weaknesses in internal control over financial reporting and to maintain effective internal control over financial reporting;

• our expectations regarding the time during which we will be an emerging growth company under the JOBS Act;

• developments relating to our competitors and our industry;

• the impact of government laws and regulations; and

• other risks and uncertainties, including those listed under the caption “Risk Factors.”

We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. We have included important factors in the cautionary statements included in this Quarterly Report on Form 10-Q, particularly in the “Risk Factors” section, that could cause actual results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, collaborations, joint ventures or investments that we may make or enter into.

You should read this Quarterly Report on Form 10-Q and the documents that we reference herein and have filed or incorporated by reference as exhibits hereto completely and with the understanding that our actual future results may be materially different from what we expect. We do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

3

PART I—FINANCIAL INFORMATION

Item 1. Condensed Consolidated Financial Statements.

ADICET BIO, INC.

Condensed Consolidated Balance Sheets

(in thousands, except share and per share amounts)

(unaudited)

	September 30, 2020			December 31, 2019
Assets
Current assets:
Cash and cash equivalents	$	84,960		$	10,607
Short-term marketable debt securities		23,160			51,793
Prepaid expenses and other current assets		9,291			1,786
Total current assets		117,411			64,186
Property and equipment, net		2,043			2,121
Goodwill		20,739			—
In-process research and development		3,490			—
Restricted cash		4,527			4,282
Long-term marketable debt securities		—			10,588
Other non-current assets		2,187			410
Total assets	$	150,397		$	81,587
Liabilities, redeemable convertible preferred stock, and stockholders’ equity
Current liabilities:
Accounts payable	$	3,838		$	1,052
Contract liabilities — related party, current		19,390			10,993
Accrued and other current liabilities		6,849			2,820
Total current liabilities		30,077			14,865
Contract liabilities — related party, net of current portion		—			10,890
Deferred rent, net of current portion		102			234
Redeemable convertible preferred stock warrant liability		—			1,881
Contingent consideration liability		2,880			—
Deferred tax liability		367			—
Other liabilities		41			—
Total liabilities		33,467			27,870
Commitments and contingencies (Note 12)
Redeemable convertible preferred stock, $0.0001 par value; none and    99,363,444 shares authorized as of September 30, 2020 and December 31,    2019, respectively; none and 97,166,921 shares issued and outstanding    as of September 30, 2020 and December 31, 2019, respectively;    liquidation preference $0 and $128,195 as of September 30, 2020    and December 31, 2019, respectively		—			114,083
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of    September 30, 2020 and December 31, 2019; none issued and    outstanding as of September 30, 2020 and December 31, 2019.		—			—
Common stock, $0.0001 par value, 150,000,000 and 140,200,938    shares authorized as of September 30, 2020 and December 31,    2019, respectively; 19,589,637 and 2,155,578 shares issued and    outstanding as of September 30, 2020 and December 31, 2019,    respectively		1			—
Additional paid-in capital		214,213			9,258
Accumulated deficit		(97,367	)		(69,647	)
Accumulated other comprehensive income		83			23
Total stockholders’ equity (deficit)		116,930			(60,366	)
Total liabilities, redeemable convertible preferred stock, and stockholders’         equity (deficit)	$	150,397		$	81,587

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

ADICET BIO, INC.

Condensed Consolidated Statements of Operations and Comprehensive Loss

(in thousands, except share and per share amounts)

(unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Revenue—related party	$	3,028		$	(7,047	)	$	12,493		$	(974	)
Operating expenses:
Research and development		8,942			6,331			24,651			17,168
General and administrative		7,741			1,847			17,684			6,069
Total operating expenses		16,683			8,178			42,335			23,237
Loss from operations		(13,655	)		(15,225	)		(29,842	)		(24,211	)
Interest income		153			276			704			561
Interest expense		(50	)		—			(84	)		—
Other income (expense), net		(1,224	)		171			(1,174	)		2,091
Loss before income tax expense (benefit)		(14,776	)		(14,778	)		(30,396	)		(21,559	)
Income tax expense (benefit)		3			—			(2,676	)		1
Net loss	$	(14,779	)	$	(14,778	)	$	(27,720	)	$	(21,560	)
Net loss per share attributable to common stockholders, basic    and diluted	$	(2.84	)	$	(6.87	)	$	(8.69	)	$	(10.10	)
Weighted-average common shares used in computing net loss    per share attributable to common stockholders, basic and    diluted		5,208,887			2,149,986			3,190,557			2,133,645
Other comprehensive income:
Unrealized (loss) gain on marketable debt securities, net of    tax		(114	)		(5	)		60			11
Total other comprehensive (loss) income		(114	)		(5	)		60			11
Comprehensive loss	$	(14,893	)	$	(14,783	)	$	(27,660	)	$	(21,549	)

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

ADICET BIO, INC.

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit)

(in thousands, except share amounts)

(Unaudited)

	Redeemable Convertible Preferred Stock						Common Stock				Additional Paid In		Accumulated			Accumulated Other Comprehensive			Total Shareholders' Equity
	Shares			Amount			Shares		Amount		Capital		Deficit			Income (Loss)			(Deficit)
Balance at December 31, 2019		97,166,921		$	114,083			2,155,578	$	—	$	9,258	$	(69,647	)	$	23		$	(60,366	)
Issuance of common stock upon exercise of stock options		—			—			19,947		—		42		—			—			42
Stock-based compensation expense		—			—			—		—		299		—			—			299
Net loss		—			—			—		—		—		(4,486	)		—			(4,486	)
Unrealized gain on marketable securities		—			—			—		—		—		—			(15	)		(15	)
Balance at March 31, 2020		97,166,921			114,083			2,175,525		—		9,599		(74,133	)		8			(64,526	)
Issuance of common stock upon exercise of stock options		—			—			3,101		—		7		—			—			7
Stock-based compensation expense		—			—			—		—		351		—			—			351
Net loss		—			—			—		—		—		(8,455	)		—			(8,455	)
Unrealized gain on marketable securities		—			—			—		—		—		—			189			189
Balance at June 30, 2020		97,166,921			114,083			2,178,626		—		9,957		(82,588	)		197			(72,434	)
Issuance of common stock upon exercise of stock options		—			—			100,092		—		144		—			—			144
Stock-based compensation expense		—			—			—		—		2,966		—			—			2,966
Conversion of shares of redeemable convertible preferred    stock to shares of common stock in connection with    the Merger		(97,166,921	)		(114,083	)		12,048,671		1		114,082		—			—			114,083
Exchange of common stock in connection with the    Merger		—			—			5,262,248		—		84,142		—			—			84,142
Conversion of redeemable convertible preferred stock    warrants to common stock warrants		—			—			—		—		2,922		—			—			2,922
Net loss		—			—			—		—		—		(14,779	)		—			(14,779	)
Unrealized loss on marketable securities		—			—			—		—		—		—			(114	)		(114	)
Balance at September 30, 2020		—		$	—			19,589,637	$	1	$	214,213	$	(97,367	)	$	83		$	116,930

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

ADICET BIO, INC.

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit)

(in thousands, except share amounts)

(Unaudited)

	Redeemable Convertible Preferred Stock				Common Stock				Additional Paid In		Accumulated			Accumulated Other Comprehensive			Total Shareholders'
	Shares		Amount		Shares		Amount		Capital		Deficit			Income (Loss)			(Deficit)
Balance at December 31, 2018		40,094,850	$	38,068		2,140,787	$	1	$	8,005	$	(41,509	)	$	(13	)	$	(33,516	)
Net loss		—		—		—		—		—		(4,131	)		—			(4,131	)
Issuance of Series A redeemable convertible    preferred stock related to TRDF liability		67,656		88		—		—		—		—			—			—
Issuance of common stock upon exercise    of stock options		—		—		4,300		—		9		—			—			9
Vesting of early exercised stock options		—		—		—		—		47		—			—			47
Stock-based compensation expense		—		—		—		—		251		—			—			251
Other comprehensive income		—		—		—		—		—		—			18			18
Balance at March 31, 2019		40,162,506		38,156		2,145,087		1		8,312		(45,640	)		5			(37,322	)
Net loss		—		—		—		—		—		(2,651	)		—			(2,651	)
Issuance of common stock upon exercise    of stock options		—		—		3,278		—		7		—			—			7
Stock-based compensation expense		—		—		—		—		223		—			—			223
Other comprehensive income		—		—		—		—		—		—			(2	)		(2	)
Balance at June 30, 2019		40,162,506		38,156		2,148,365		1		8,542		(48,291	)		3			(39,745	)
Net loss		—		—		—		—		—		(14,778	)		—			(14,778	)
Issuance of Series B redeemable convertible preferred    stock, net of issuance cost of $5,087		57,004,415		74,913		—		—		—		—			—			—
Termination of redeemable convertible    preferred stock tranche liability		—		1,143		—		—		—		—			—			—
Issuance of common stock upon exercise    of stock options		—		—		3,903		—		8		—			—			8
Stock-based compensation expense		—		—		—		—		391		—			—			391
Other comprehensive income		—		—		—		—		—		—			(5	)		(5	)
Balance at September 30, 2019		97,166,921	$	114,212		2,152,268	$	1	$	8,941	$	(63,069	)	$	(2	)	$	(54,129	)

The accompanying notes are an integral part of these condensed consolidated financial statements.

7

ADICET BIO, INC.

Condensed Consolidated Statements of Cash Flows

(in thousands)

(unaudited) 

	Nine Months Ended September 30,
	2020			2019
Cash flows from operating activities
Net loss	$	(27,720	)	$	(21,560	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense		911			962
Stock-based compensation expense		3,616			865
Gain on disposal of property and equipment		—			3
Net amortization of premiums and accretion discounts on investments		(4	)		(143	)
Change in fair value of redeemable convertible preferred stock tranche liability    and TRDF liability		—			(2,024	)
Change in fair value of redeemable convertible preferred stock warrant liability		897			(62	)
Amortization of deferred debt issuance costs		84			—
Changes in operating assets and liabilities:
Prepaid expenses and other current assets		(5,000	)		837
Other non-current assets		(1,560	)		19
Accounts payable		1,442			244
Contract liabilities — related party		(2,493	)		974
Deferred rent		(119	)		(111	)
Accrued and other current liabilities		1,738			(627	)
Other liabilities		1			—
Net cash used in operating activities		(28,207	)		(20,623	)
Cash flows from investing activities
Cash and restricted cash acquired in connection with the Merger		64,114			—
Purchases of marketable debt securities		(5,700	)		(60,056	)
Proceeds from maturities of marketable debt securities		44,985			17,750
Purchases of property and equipment		(630	)		(611	)
Net cash provided by (used in) investing activities		102,769			(42,917	)
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		—			77,044
Proceeds from exercise of stock options		193			24
Deferred debt issuance costs		(157	)		—
Net cash provided by financing activities		36			77,068
Net change in cash, cash equivalents and restricted cash		74,598			13,528
Cash, cash equivalents and restricted cash, at the beginning of period		14,889			13,757
Cash, cash equivalents and restricted cash, at the end of period	$	89,487		$	27,285
Reconciliation of cash, cash equivalents and restricted cash to condensed    consolidated balance sheets:
Cash and cash equivalents	$	84,960		$	23,003
Restricted cash		4,527			4,282
Cash, cash equivalents and restricted cash in condensed consolidated balance sheets	$	89,487		$	27,285
Supplemental cash flow information
Cash paid for income taxes		3		$	1
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable	$	76		$	58
Conversion of redeemable convertible preferred stock into common stock	$	114,083		$	—
Conversion of redeemable convertible preferred stock warrants into common stock warrants	$	2,922		$	—
Fair value of net assets acquired in Merger	$	84,142		$	—
Vesting of early exercised stock options	$	—		$	47
Issuance of redeemable convertible preferred stock warrants in connection with the Loan Agreement	$	144		$	—
Termination of redeemable convertible preferred stock tranche liability	$	—		$	1,143
Redeemable convertible preferred stock warrants issued in exchange for services in    connection with issuance of Series B redeemable convertible preferred stock    recorded as issuance costs	$	—		$	2,131
Settlement of TRDF liability	$	—		$	88

The accompanying notes are an integral part of these condensed consolidated financial statements.

8

ADICET BIO, INC.

Notes to Interim Condensed Consolidated Financial Statements (Unaudited)

1. Organization and Nature of the Business

Adicet Bio, Inc. (formerly resTORbio, Inc. (“resTORbio”)), together with its subsidiaries, (the “Company”) is a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases.  The Company is advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors and T cell receptor-like antibodies to enhance selective tumor targeting, facilitate innate and adaptive anti-tumor immune response, and improve persistence for durable activity in patients. The Company believes its approach has potentially significant advantages over alpha beta T cells, which are the basis of standard CAR-T cell therapies. The Company was incorporated in November 2014 in Delaware and the principal executive offices are located in Boston, Massachusetts and other office in Menlo Park, California.

Adicet Bio, Inc. (when referred to prior to the Merger (as defined below), (“Former Adicet”)) was incorporated in November 2014 in Delaware and was headquartered in Menlo Park, California. Adicet Bio Israel Ltd. (formerly Applied Immune Technologies Ltd.) (“Adicet Israel”) is a wholly owned subsidiary of Former Adicet and is located in Haifa, Israel. Adicet Israel was founded in 2006. During 2019, Former Adicet consolidated its operations, including research and development activities, in the United States and as a result substantially reduced its operations in Israel.

Merger with resTORbio

Prior to September 15, 2020, the Company was a clinical-stage biopharmaceutical company known as resTORbio that had historically focused on developing innovative medicines that target the biology of aging, to prevent or treat age-related diseases with the potential to extend healthy lifespans. On April 28, 2020, resTORbio entered into a definitive merger agreement with Former Adicet to create a combined publicly-traded biotechnology company whose anticipated focus will be on the development of the Company’s off-the-shelf allogeneic gamma delta T cell therapies for oncology and other indications. Under the terms of the merger agreement, Former Adicet agreed to merge with a wholly owned subsidiary of resTORbio in an all-stock transaction with Former Adicet surviving as a wholly-owned subsidiary of resTORbio and changing its name to “Adicet Therapeutics, Inc.” (such transactions, the “Merger”). Under the exchange ratio formula in the merger agreement, immediately following the effective time of the Merger, the securityholders of Former Adicet as of immediately prior to the effective time of the Merger owned approximately 75% of the outstanding shares of the Company’s common stock on a fully-diluted basis and securityholders of resTORbio as of immediately prior to the effective time of the Merger owned approximately 25% of the outstanding shares of the Company’s common stock on a fully-diluted basis (in each case excluding equity incentives available for grant).

The Company has concluded that the transaction represents a business combination pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 805, Business Combinations. Further, Former Adicet was determined to be the accounting acquirer based upon the terms of the Merger and other factors including: (i) Former Adicet’s securityholders own approximately 75% of the voting rights of the combined company (on a fully-diluted basis excluding equity incentives available for grant); (ii) Former Adicet designated a majority (five of seven) of the initial members of the Board of Directors of the combined company; and (iii) the terms of the exchange of equity interests based on the exchange ratio at the announcement of the Merger factored in an implied premium to resTORbio’s stockholders. The composition of senior management of the combined company was determined to be a neutral factor in the accounting acquirer determination, as the combined company will leverage the expertise of the senior management of both companies. Accordingly, the reported operating results prior to the business combination will be those of Former Adicet.

On September 15, 2020, the Company completed the Merger pursuant to the merger agreement (the “Effective Time”). In connection with the Merger, and immediately prior to the Effective Time, the Company effected a reverse stock split of the Company’s common stock at a ratio of 1-for-7 (the “Reverse Stock Split”). Also, in connection with the Merger, the Company changed its name from “resTORbio, Inc.” to “Adicet Bio, Inc.” (the “Name Change”), Former Adicet changed its name from “Adicet Bio, Inc.” to “Adicet Therapeutics, Inc.” and the business conducted by the Company became primarily the business which was previously conducted by Former Adicet, which is a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases..

At the Effective Time, each outstanding share of Former Adicet capital stock was converted into the right to receive 0.1240 (the “Exchange Ratio”) shares of Company’s common stock, as set forth in the merger agreement. The Exchange Ratio was determined based on the total number of outstanding shares of Company’s common stock and Former Adicet capital stock, each on a fully diluted basis, and the respective valuations of Former Adicet and resTORbio at the time of

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execution of the Merger Agreement. In connection with the Merger, the Company also assumed certain outstanding Former Adicet warrants and Former Adicet stock options under Former Adicet’s 2015 Stock Incentive Plan (the “2015 Adicet Stock Incentive Plan”) and Former Adicet’s 2014 Share Option Plan (the “2014 Share Option Plan” and, together with the 2015 Adicet Stock Incentive Plan, the “Former Adicet Plans”), with such stock options and warrants henceforth representing the right to purchase a number of shares of Company’s common stock equal to the Exchange Ratio multiplied by the number of shares of Former Adicet’s capital stock previously represented by such stock options and warrants, as applicable, with a proportionate adjustment in exercise price. In connection with the Merger, the Company also assumed the Former Adicet Plans.

Immediately following the Effective Time, there were approximately 19,589,828 shares of the Company’s common stock outstanding (post Reverse Stock Split). Immediately following the Effective Time, the former equity holders of Former Adicet held approximately 75% of the outstanding shares of Company’s common stock on a fully-diluted basis and the former equity holders of resTORbio held approximately 25% of the outstanding shares of Company’s common stock on a fully-diluted basis (in each case excluding equity incentives available for grant).

Please refer to Note 3 “Business Combinations” for further details of the Merger.

Liquidity

The Company had $108.1 million in cash, cash equivalents, and marketable debt securities and an accumulated deficit of $97.4 million as of September 30, 2020. The Company has historically financed its operations primarily through a collaboration and licensing arrangement, through the private placement of equity securities and debt, and cash received in the Merger. To date, none of the Company’s product candidates have been approved for sale and therefore the Company has not generated any revenue from product sales. Management expects operating losses and negative cash flows to continue for the foreseeable future, until such time, if ever, that it can generate significant sales of its product candidates currently in development.

The Company expects that its cash and cash equivalents will be sufficient to fund its forecasted operating expenses, capital expenditure requirements and debt service payments for at least the next twelve months from the issuance of these condensed consolidated financial statements.

All of the Company’s revenue to date is generated from the Regeneron Agreement, which is a collaboration and license agreement. The Company does not expect to generate any significant product revenue until it obtains regulatory approval of and commercialize any of the Company’s product candidates or enter into additional collaborative agreements with third parties, and it does not know when, or if, either will occur. The Company expects to continue to incur significant losses for the foreseeable future, and it expects the losses to increase as the Company continues the development of, and seek regulatory approvals for, its product candidates and begin to commercialize any approved products. The Company is subject to all of the risks typically related to the development of new product candidates, including, but not limited to, raising additional capital, development by its competitors of new technological innovations, risk of failure in preclinical and clinical studies, safety and efficacy of its product candidates in clinical trials, the risk of relying on external parties such as contract research organizations (“CROs”) and contract manufacturing organizations (“CMOs”), the regulatory approval process, market acceptance of the Company’s products once approved, lack of marketing and sales history, dependence on key personnel and protection of proprietary technology and it may encounter unforeseen expenses, difficulties, complications, delays, and other unknown factors that may adversely affect its business.

Until such time as the Company can generate significant revenue from product sales, if ever, the Company expects to finance its operations through the sale of equity, debt financings, collaborative or other arrangements with corporate or other sources of financing.  Adequate funding may not be available to the Company on acceptable terms or at all. The Company’s failure to raise capital as and when needed could have a negative impact on its financial condition and the Company’s ability to pursue its business strategies. Although the Company continues to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all.

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2. Summary of Significant Accounting Policies

Basis of Presentation

The unaudited interim condensed consolidated financial statements and related disclosures have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Principles of Consolidation

The interim condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The U.S. dollar is the functional and reporting currency of the Company and its subsidiaries.

Reverse Stock Split

On September 15, 2020, immediately before the closing of the Merger, resTORbio effected a 1-for-7 reverse stock split of resTORbio’s common stock. Accordingly, all share and per share amounts for all periods presented in the accompanying condensed consolidated financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split. No fractional shares were issued in connection with the Reverse Stock Split. Unless otherwise noted, all references to common stock share and per share amounts have also been adjusted to reflect the exchange ratio of 0.1240.

Unaudited Interim Financial Information

The condensed consolidated balance sheet as of December 31, 2019 was derived from the Company’s audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of September 30, 2020 and for the three and nine months ended September 30, 2020 and 2019, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2019 included in the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 16, 2020. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of September 30, 2020 and condensed consolidated results of operations for the three and nine months ended September 30, 2020 and 2019 and condensed consolidated cash flows for the nine months ended September 30, 2020 and 2019 have been made. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2020.

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Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements as well as the reported amounts of revenues and expenses during the reporting period. Such estimates include the valuation of the intangible assets acquired in business combinations, redeemable convertible preferred stock warrant liability, redeemable convertible preferred stock tranche liability, the Technion Research and Development Foundation liability (“TRDF Liability”), contingent consideration liability for contingent value right (“CVR”), deferred tax assets, useful lives of property and equipment, accruals for research and development activities, revenue recognition and stock-based compensation. Actual results could differ from those estimates. The current COVID-19 (coronavirus) pandemic, which is impacting worldwide economic activity, poses risk that the Company or its employees, contractors, suppliers, and other partners may be prevented from conducting business activities for an indefinite period of time, including due to shutdowns that may be requested or mandated by governmental authorities. The extent to which the coronavirus impacts the Company’s operations will depend on future developments, which are highly uncertain and cannot be predicted with confidence, including the duration of the outbreak, new information that will emerge concerning the severity of the coronavirus and the actions to contain the coronavirus or treat its impact, among others. COVID-19 may impact the timing of regulatory approval of the INDs for clinical trials, the enrollment of any clinical trials that are approved, the availability of clinical trial materials and regulatory approval and commercialization of our products. COVID-19 may also impact the Company’s ability to access capital, which could negatively impact short-term and long-term liquidity.

Business Combinations

Business combinations are accounted for under the acquisition method. The Company recognizes the assets acquired and liabilities assumed in business combinations on the basis of their fair values at the date of acquisition. The Company assesses the fair value of assets acquired, including intangible assets, and liabilities assumed using a variety of methods. Each asset acquired and liability assumed is measured at fair value from the perspective of a market participant. The method used to estimate the fair values of intangible assets incorporates significant estimates and assumptions regarding the estimates a market participant would make in order to evaluate an asset, including a market participant’s use of the asset, future cash inflows and outflows, probabilities of success, asset lives, and the appropriate discount rates. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Any excess purchase price over the fair value of the net tangible and intangible assets acquired is allocated to goodwill. Transaction costs and restructuring costs associated with a business combination are expensed as incurred.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the condensed consolidated statements of operations as operating expenses or income.

Contingent Consideration Liability

The estimated fair value of contingent consideration liability, initially measured and recorded on the acquisition date, is considered to be a Level 3 instrument. The contingent consideration liability is recorded at fair value at the end of each reporting period with changes in estimated fair values recorded in research and development expenses in the condensed consolidated statements of operations.

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net tangible and identified intangible assets acquired in a business combination. Goodwill is not amortized but is evaluated at least annually for impairment or when a change in facts and circumstances indicate that the fair value of the goodwill may be below its carrying value.

Goodwill is tested for impairment at the reporting unit level annually in the fourth quarter, or more frequently when events or changes in circumstances indicate that the asset might be impaired. Examples of such events or circumstances include, but are not limited to, a significant adverse change in legal or business climate, an adverse regulatory action or unanticipated competition. The Company has determined that it operates in a single operating segment and has a single reporting unit.

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Prior to performing the impairment test, the Company assesses qualitative factors to determine whether the existence of events or circumstances would indicate that it is more likely than not that the fair value of the reporting unit was less than its carrying amount. If after assessing the totality of events or circumstances, the Company were to determine that it is more likely than not that the fair value of the reporting unit is less than its carrying amount, then the Company would perform a quantitative impairment test.

The quantitative impairment test involves comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets, goodwill is not impaired, and no further testing is required. If the fair value of the reporting unit is less than the carrying value, the Company measures the amount of impairment loss, if any, as the excess of the carrying value over the fair value of the reporting unit. The Company has determined there were no indicators of goodwill impairment as of September 30, 2020.

Intangible Assets

In connection with the Merger, the Company acquired certain IPR&D assets, which were classified as indefinite-lived intangible assets. Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires and have not been completed at the acquisition date. The fair value of IPR&D acquired in a business combination is recorded on the Company’s condensed consolidated balance sheets at the acquisition-date fair value and is determined by estimating the costs to develop the technology into commercially viable products, estimating the resulting revenue from the products, and discounting the projected net cash flows to present value. IPR&D is not amortized, but rather is reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned, or transferred to a third party.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB ASC or other standard setting bodies and adopted by the Company as of the specified effective date, unless otherwise discussed below.

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. The new disclosure requirements include disclosure related to changes in unrealized gains or losses included in other comprehensive income (loss) for recurring Level 3 fair value measurements held at the end of each reporting period and the explicit requirement to disclose the range and weighted-average of significant unobservable inputs used for Level 3 fair value measurements. This ASU removes the requirement to disclose: the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. For all entities, this ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company adopted this ASU effective January 1, 2020. The adoption of this ASU did not have a material effect on the Company’s condensed consolidated financial statements and related disclosures.

Recently Issued Accounting Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) (“ASU 2020-04”). The amendments in ASU 2020-04 provide optional expedients and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. An entity may elect to apply the amendments for contract modifications by Topic or Industry Subtopic as of any date from the beginning an interim period that includes or is subsequent to March 12, 2020, or prospectively from the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic, the amendments must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. The Company may elect to apply ASU 2020-04 as its contracts referenced in London Interbank Offered Rate (“LIBOR”) are impacted by reference rate reform. The Company is currently evaluating the impact of the adoption of this ASU on the Company’s consolidated financial statements.

3. Business Combination

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On September 15, 2020, Former Adicet completed its merger with resTORbio. Based on the Exchange Ratio of 0.1240, immediately following the Merger, resTORbio stockholders and holders of resTORbio restricted stock units and options to acquire resTORbio common stock owned approximately 25.0% of the outstanding capital stock of the combined company on a fully diluted basis, and Former Adicet stockholders, holders of options or warrants to acquire Former Adicet capital stock owned approximately 75.0% of the outstanding capital stock of the combined company on a fully diluted basis. At the closing of the Merger, all shares of Former Adicet common stock and Former Adicet redeemable convertible preferred stock then outstanding were converted to Former Adicet’s common stock under their original terms and were then exchanged for the Company’s common stock.

resTORbio’s stockholders will continue to own and hold their existing shares of the Company’s common stock (after giving effect to the 1-for-7 reverse stock split). Pursuant to the terms of the Merger, the vesting of all outstanding resTORbio stock options was accelerated in full as of immediately prior to the Effective Time. All out-of-the-money resTORbio stock options were cancelled for no consideration. All in-the-money resTORbio stock options remained outstanding after the completion of the Merger in accordance with their terms. For accounting purposes, the Company assumed 81,370 in-the-money resTORbio stock options after giving effect to reverse stock split. In addition, 91,309 unvested resTORbio restricted stock units outstanding and unsettled, after giving effect to reverse stock split, as of immediately prior to the effective time of the Merger, were accelerated in full  and the holders of such restricted stock units  received 55,854 shares of the Company’s common stock (after reduction by the number of shares of resTORbio common stock necessary to satisfy applicable tax withholding obligations at the maximum statutory rate). The fair value of these modified stock options and restricted stock units attributable to pre-combination services was recorded as a component of consideration transferred and the fair value of these modified stock options and restricted stock units attributable to post-combination services was recognized as stock compensation expense in the Company’s condensed consolidated statement of operations. 

In connection with the Merger, the Company entered into a Contingent Value Rights Agreement (the “CVR Agreement”) with Computershare Inc. and Computershare Trust Company, N.A. as joint rights agent. Per the terms of the Merger, each holder of resTORbio common stock as of immediately prior to the completion of the Merger is entitled to one contractual contingent value right, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the Effective Time. The CVR holders are entitled to receive net proceeds from the commercialization, if any, received from a third-party commercial partner of RTB101, resTORbio’s small molecule product candidate that is a potent inhibitor of target of rapamycin complex 1 (TORC1), for a COVID-19 related indication. The CVR is accounted for as contingent consideration, the fair value of which was determined using an income approach. This approach utilized a probability adjusted discounted cash flow that would accrue to the Company and then deducting the administrative fee to be retained by the Company and other permitted deductions in order to arrive at the net cash expected to be paid out to the CVR holders. These cash flows were then discounted to present value using the same discount rate applied in the valuation of the IPR&D. The probability adjusted discounted cash flow includes significant estimates and assumptions pertaining to commercialization events and cash consideration received by the Company for the grant of rights to commercialize RTB101 during the term of the CVR Agreement. The most significant unobservable inputs are the probabilities of achieving regulatory approval of the development projects and subsequent commercial success. Significant changes in any of the probabilities of success would result in a significantly higher or lower fair value measurement. Significant changes in the probabilities as to the periods in which commercialization of RTB101 will be achieved would result in a significantly lower or higher fair value measurement. (refer to Note 4 “Fair Value Measurements”).

The total purchase price has been allocated to the tangible and intangible assets acquired and liabilities assumed of resTORbio based on their fair values as of the completion of the Merger, with the excess allocated to goodwill. The purchase price is calculated based on the fair value of resTORbio common stock that the resTORbio stockholders owned as of the closing date of the merger because, with no active trading market for shares of Adicet, the fair value of the resTORbio’s common stock represented a more reliable measure of the fair value of consideration transferred in the Merger. The following summarizes the purchase price in the Merger (in thousands, except share and per share amounts):

Fair value of common stock shares of the combined company    owned by resTORbio stockholders (1)	$	83,516
Fair value of contingent consideration liability with respect to CVR (2)		2,880
Estimated fair value of modified stock options and    restricted stock units attributable to pre-combination services (3)		626
Purchase price	$	87,022

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(1) Represents the share consideration of the combined company that the resTORbio stockholders own as of the closing of the merger calculated as follows:

Number of shares of the combined company owned by resTORbio    stockholders (a)		5,207,695
Multiplied by the fair value per share of resTORbio common    stock (b)	$	16.59
Acquisition date fair value of resTORbio		86,396
Less: portion of the fair value to be distributed as CVR (c)		(2,880	)
Fair value of shares of the combined company  owned by resTORbio    stockholders	$	83,516

a. Represents the number of shares of common stock of the combined company that the resTORbio stockholders owned as of the closing of the merger. This amount is calculated as 5,207,695 shares of resTORbio common stock outstanding as of September 15, 2020.

b. The purchase price is based on the closing price of resTORbio common stock on September 14, 2020.

c. The fair value of resTORbio common stock was further adjusted to remove the estimated fair value of the CVR embedded within the closing price, as each holder of resTORbio stock will receive one contractual CVR immediately prior to the Merger.

(2) Each holder of resTORbio common stock as of immediately prior to the completion of the merger was entitled to one CVR issued by resTORbio, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the effective time of the Merger

(3) Based on the capitalization of resTORbio as of September 15, 2020, 91,309 outstanding unvested resTORbio restricted stock units were accelerated in connection with the merger and holders of the restricted stock units were issued approximately 55,854 shares of resTORbio common stock on a net settlement basis. Similarly, in connection with the merger, vesting of outstanding resTORbio stock options was accelerated in full and the stock options that were not in the in-the-money on the close of the merger were canceled, resulting in approximately 81,370 surviving stock options. The acquisition date fair value of these modified resTORbio restricted stock units and resTORbio stock options attributable to the pre-combination services is included in the estimated purchase price.

The Merger was accounted for as a business combination which requires that assets acquired and liabilities assumed be recognized at their fair value as of the acquisition date. While the Company uses its best estimates and assumptions as part of the purchase price allocation process to value the assets acquired and liabilities assumed on the acquisition date, its estimates and assumptions are subject to refinement. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can materially impact the Company’s results of operations. The purchase price allocation is preliminary and is subject to change, including for the valuation of intangible assets and contingent consideration, income taxes and related valuation allowances and certain assets and liabilities among other items. The amounts recognized will be finalized as the information necessary to complete the analysis is obtained, but no later than one year after the acquisition date. Any potential adjustments made could be material in relation to the preliminary values presented below.

The following summarizes the allocation of the purchase price to the net tangible and intangible assets acquired (in thousands):

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Net assets acquired:
Cash and cash equivalents	$	63,869
Prepaid expenses and other current assets		2,505
Property and equipment		318
IPR&D		3,490
Restricted cash		245
Accounts payable		(1,316	)
Accrued and other current liabilities		(2,421	)
Other liabilities		(40	)
Deferred tax liability		(367	)
Goodwill		20,739
Purchase price	$	87,022

The goodwill of $20.7 million is not tax deductible and represents the excess of the consideration paid over the fair value of assets acquired and liabilities assumed. Goodwill is mainly attributable to the enhanced value of the combined company, as reflected in the increase in market value of the resTORbio common shares following the announcement of the Merger with Former Adicet.

The fair value of acquired IPR&D related to the research and development of RTB101 for a COVID-19 related indication. The RTB101 compound IPR&D project was valued using an income approach, specifically a projected discounted cash flow method, adjusted for the probability of technical success (“PTS”). The projected discounted cash flow models used to estimate the Company’s IPR&D reflect significant assumptions regarding the estimates a market participant would make in order to evaluate a drug development asset, including the following:

- Estimates of potential cash flows to be generated by the project and resulting asset, which was developed utilizing estimates of total patient population, market penetration rates, demand risk adjustment factors, and product pricing;

- Estimates regarding the timing of and the expected costs of goods sold, research and development expenses, selling, general and administrative expenses to advance the clinical programs to commercialization, cash flow adjustments and partner profit split;

- The projected cash flows were then adjusted using PTS factors that were selected considering both the current state of clinical development and the nature of the proposed indication, (i.e., respiratory therapeutics.); and

- Finally, the resulting probability adjusted cash flows were discounted to a present value using a risk-adjusted discount rate, developed considering the market risk present in the forecast and the size of the asset.

This IPR&D intangible asset is not amortized, but rather are reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned, or transferred to a third party.

The contingent consideration for the CVR was valued using an income approach, leveraging the probability adjusted discounted cash flow that would accrue to the combining company and then deducting the administrative fee to be retained by the combined company and other permitted deductions in order to arrive at the net cash expected to be paid out to the CVR holders. The probability adjusted cash flow includes significant estimates and assumptions pertaining to commercialization events and cash consideration received by the Company for the grant of rights to commercialize RTB101 during the term of the CVR Agreement (as discussed above). These cash flows were then discounted to present value using the same discount rate applied in the valuation of the IPR&D.

Transaction costs for the Merger were $2.1 million and $7.1 million for the three month and nine month ended September 30, 2020, respectively and were expensed as incurred in general and administrative expenses in the condensed consolidated statements of operations.

The following supplemental unaudited pro forma information represents the Company’s financial results as if the acquisition of resTORbio had occurred on January 1, 2019 (in thousands).

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	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Revenue	$	3,028		$	(7,047	)	$	12,493		$	(974	)
Net loss	$	(9,791	)	$	(53,794	)	$	(26,424	)	$	(100,142	)

The above unaudited pro forma information was determined based on the historical GAAP results of the Company and resTORbio. The unaudited pro forma consolidated results are not necessarily indicative of what the Company’s consolidated results of operations would have been if the acquisition was completed on January 1, 2019. The unaudited pro forma consolidated net loss includes pro forma adjustments primarily relating to the reclassification of transaction costs and severance payments directly related to the closing of the Merger of $8.6 million from the three months ended September 30, 2020 to the three months ended September 30, 2019 and $15.6 million from the nine months ended September 30, 2020 to the nine months ended September 30, 2019. The unaudited proforma information include proforma adjustments to eliminate the impact of the change in the fair value of redeemable convertible preferred stock tranche liability, TRDF liability, and redeemable convertible warrant liability during the three and nine months ended September 30, 2020 and September 30, 2019 as the redeemable convertible preferred stock tranche liability, TRDF liability, and redeemable convertible warrant liability did not exist once the redeemable convertible preferred stock were converted to common stock in the Merger. The unaudited proforma information also includes proforma adjustments to reclassify stock compensation expense related to the conversion of resTORbio stock options and restricted stock units and the modification of stock option awards to Former Adicet CEO in connection with the Merger to January 1, 2019. Further, stock compensation expense related to resTORbio stock options and restricted stock units recognized in the books of resTORbio prior to the Merger in 2019 and 2020 was reversed in the proforma information.

Former Chief Executive Officer’s Transition Agreement

On April 28, 2020, in connection with the Merger the Company entered into a transition agreement with Anil Singhal, Former Adicet’s Chief Executive Officer and President, pursuant to which Dr. Singhal transitioned from his role as Chief Executive Officer and President to an advisory role immediately after the closing of the Merger. In accordance with such agreement, Dr. Singhal is entitled to the following compensation: (1) cash payments of (i) $470,000 within 60 days following the closing of the Merger, (ii) an amount equal to his pro-rated bonus of $212,000 for the 2020 calendar year payable within 60 days following the closing of the Merger, (iii) $250,000 payable in one lump sum on January 1, 2021 and (iv) $24,000 payable within 60 days following the closing of the Merger, (2) 12 months’ of accelerated vesting of his unvested options to purchase the Company’s common stock upon completion of the Merger, and (3) a 12-month post-termination exercise period following termination of his independent contractor services agreement, dated April 28, 2020 (the “ICSA”), subject to any earlier expiration of the options to purchase the Company’s common stock by their terms. In addition, Dr. Singhal is entitled to reimbursement of up to $15,000 of his reasonable and documented legal expenses incurred in connection with such transition agreement. Pursuant to such agreement, subject to Dr. Singhal’s continued service through the completion of the Merger and contingent on completion of the Merger, Dr. Singhal’s continued service for purposes of vesting of his options to purchase the Company’s common stock will continue until the earlier of (i) May 7, 2021 or (ii) termination of the ICSA, provided, however, if the ICSA is terminated early without cause, Dr. Singhal is entitled to accelerated vesting of unvested options that would have vested from the date of such termination through May 7, 2021. In addition, Dr. Singhal’s existing options acceleration provisions will terminate. Pursuant to the ICSA, Dr. Singhal will provide certain advisory services to the Company for a term of 12 months following the closing of the merger and is entitled to payments of $12,500 per month for such services.

4. Fair Value Measurements

The Company determines the fair value of financial and non-financial assets and liabilities using the fair value hierarchy which establishes three level of inputs that may be used to measure fair value, as follows:

Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities.

Level 2— Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

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Level 3— Unobservable inputs which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value.

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	September 30, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	10	$	—	$	—	$	10
Cash equivalents(1)		10		—		—		10
Asset-backed securities		—		14,689		—		14,689
Corporate debt securities		—		5,722		—		5,722
Commercial paper		—		2,749		—		2,749
Marketable debt securities		—		23,160		—		23,160
Total fair value of assets	$	10	$	23,160	$	—	$	23,170
Liabilities:
Contingent consideration	$	—	$	—	$	2,880		2,880
Total fair value of liabilities	$	—	$	—	$	2,880	$	2,880

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	7,232	$	—	$	—	$	7,232
Cash equivalents(1)		7,232		—		—		7,232
Asset-backed securities		—		19,598		—		19,598
Corporate debt securities		—		19,394		—		19,394
Commercial paper		—		17,892		—		17,892
U.S. Government agency bonds		—		5,497		—		5,497
Marketable debt securities		—		62,381		—		62,381
Total fair value of assets	$	7,232	$	62,381	$	—	$	69,613
Liabilities:
Redeemable convertible preferred stock warrant    liability	$	—	$	—	$	1,881		1,881
Total fair value of liabilities	$	—	$	—	$	1,881	$	1,881

(1) Included in cash and cash equivalents in the condensed consolidated balance sheets

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The following tables presents a summary of the changes in the fair value of the Company’s Level 3 financial instruments (in thousands):

	Redeemable Convertible Preferred Stock Tranche Liability			TRDF Liability			Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2018	$	3,113		$	142		$	—
Recognition of preferred stock warrant liabilities		—			—			2,131
Change in the fair value included in other income, net		(1,970	)		(54	)		(62	)
Settlement		—			(88	)		—
Termination		(1,143	)		—			—
Fair value as of September 30, 2019	$	—		$	—		$	2,069

	Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2019	$	1,881
Recognition of preferred stock warrant liability		144
Change in the fair value included in other income, net		897
Conversion of convertible preferred stock warrant into common stock warrant    in connection with Merger		(2,922	)
Fair value as of September 30, 2020	$	—

The fair value of the redeemable convertible preferred stock tranche liability, TRDF Liability and the redeemable convertible preferred stock warrant liability is based on significant unobservable inputs, which represent Level 3 measurements within the fair value hierarchy. In determining the fair value of the redeemable convertible preferred stock tranche liability and the redeemable convertible preferred stock warrants, the Company used the Black-Scholes option-pricing model to estimate the fair value using unobservable inputs including the expected term, expected volatility, risk-free interest rate and dividend yield (see Note 14). There were no warrants outstanding for the purchase of redeemable convertible preferred stock as of September 30, 2020, as all such warrants were converted to warrants for the purchase of shares of common stock upon the Merger. The fair value of the TRDF Liability was determined based on fair value of the Company’s Series A redeemable convertible preferred stock.

As part of the acquisition of resTORbio, the Company entered into a CVR Agreement and recorded the fair value of the CVR as part of consideration transferred. The Company considers the contingent consideration liability a Level 3 instrument (one with significant unobservable inputs) in the fair value hierarchy (see Note 3).

5. Marketable Debt Securities

The following table summarizes the Company’s marketable debt securities (in thousands):

	September 30, 2020
	Amortized Cost		Unrealized Losses		Unrealized Gains		Fair Value
Asset-backed securities	$	14,639	$	—	$	50	$	14,689
Corporate debt securities		5,700		—		22		5,722
Commercial paper		2,738		—		11		2,749
Total	$	23,077	$	—	$	83	$	23,160

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	December 31, 2019
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Asset-backed securities	$	19,589	$	(1	)	$	10	$	19,598
Corporate debt securities		19,387		(3	)		9		19,393
Commercial paper		17,882		—			11		17,893
U.S. Government agency bonds		5,500		(3	)		—		5,497
Total	$	62,358	$	(7	)	$	30	$	62,381

The following table summarizes the classification of the Company’s marketable debt securities in the condensed consolidated balance sheets (in thousands):

	September 30,		December 31,
	2020		2019
Short-term marketable debt securities		23,160		51,793
Long-term marketable debt securities		—		10,588
Total	$	23,160	$	62,381

6. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Prepaid expenses	$	2,416	$	615
Prepaid insurance		3,353		57
Tax receivable		3,400		722
Interest receivable		67		213
Other current assets		55		179
Total prepaid expenses and other current assets	$	9,291	$	1,786

7. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	Useful life (in years)		September 30, 2020			December 31, 2019
Laboratory equipment	3		$	4,305		$	3,872
Leasehold improvements	Lesser of useful life or lease term		$	1,406		$	1,327
Furniture and fixtures	3			526			68
Construction in progress		—		94			300
Computer equipment	3			91			42
Software	3			170			150
				6,592			5,759
Less: Accumulated depreciation and amortization				(4,549	)		(3,638	)
Property and equipment, net			$	2,043		$	2,121

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Depreciation and amortization expense was $0.3 million and $0.9 million for the three and nine months ended September 30, 2020, respectively. Depreciation and amortization expense was $0.3million and $1.0 million for three and nine months ended September 30, 2019, respectively.

8. Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Accrued compensation	$	4,455	$	1,359
Accrued research and development expenses		552		450
Accrued professional services		1,016		301
Accrued other liabilities		826		710
Total accrued and other liabilities	$	6,849	$	2,820

9. Term Loan

On April 28, 2020, the Company entered into a Loan and Security Agreement with Pacific Western Bank for a term loan not exceeding $12.0 million (the “Loan Agreement”) to finance leasehold improvements for its new corporate headquarters in Redwood City, California and other purposes permitted under the Loan Agreement, with an interest rate equal to the greater of 0.25% above the Prime Rate (as defined in the Loan Agreement) or 5.00%. The Loan Agreement granted to Pacific Western Bank a security interest on substantially all of the Company’s assets other than intellectual property to secure the performance of the Company’s obligations under the Loan Agreement, and contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets or distributions, limitations on the incurrence of additional debt or liens and other customary requirements. As of September 30, 2020, the Company was in compliance with such covenants and had no indebtedness outstanding under the Loan Agreement.

In connection with the entrance into the Loan Agreement, the Company issued Pacific Western Bank a warrant to purchase shares of its Series B redeemable convertible preferred stock at an exercise price of $1.4034 per share (the “Existing PacWest Warrant”). The Existing PacWest Warrant was initially exercisable for 42,753 shares of the Company’s Series B redeemable convertible preferred stock (not adjusted for the Exchange Ratio) and will be exercisable for an additional number of shares of its Series B redeemable convertible preferred stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 128,260 shares of the Company’s Series B redeemable convertible preferred stock (not adjusted for the Exchange Ratio). Pursuant to the terms of the Existing PacWest Warrant and the merger agreement (see Note 3), at the effective time of the merger, the Company issued a new common stock warrant to Pacific Western Bank (the “New PacWest Warrant”) which replaced the Existing PacWest Warrant. The New PacWest Warrant is initially exercisable solely for 5,301 shares of the Company’s common stock will be exercisable for an additional number of shares of the Company’s common stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 15,903 shares of the Company’s common stock). Any restriction on the exercise set forth in the Existing PacWest Warrant are in full force and effect in the New PacWest Warrant and the term, exercisability, vesting schedule and other provisions of the Existing PacWest warrant otherwise remain unchanged in the New PacWest Warrant.

The Company may request to draw upon the term loan at any time through the date eighteen months after the date of the Loan Agreement (“Availability End Date”), which is October 28, 2021. As of September 30, 2020, no amounts have been drawn under the Loan Agreement. Further, the New PacWest Warrant to purchase 5,301 shares of the Company’s common stock is immediately exercisable. However, none of the warrants have been exercised as of September 30, 2020.

At issuance, the Company accounted for the fair value of the Existing PacWest Warrant, determined to be $0.1 million, as a liability and as a corresponding deferred debt issuance cost which was amortized on a straight-line basis until the Availability End Date in interest expenses. The liability was adjusted to fair value each reporting period through earnings.  Upon issuance of the New PacWest Warrant, the liability was reclassified to additional paid-in capital and is no longer subject to remeasurement at fair value. The fair value of the New PacWest Warrant was equal to the fair value of the Existing PacWest Warrant on the Merger date.  Accordingly, no incremental expense was recognized at the Merger date.

Upon each draw of the term loan, the Company will derecognize the proportionate unamortized amount of the deferred asset and account for it as a debt discount to the drawn term loan. The debt discount will be presented in the

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consolidated balance sheet as a direct adjustment to the carrying value of the term loan. The debt discount will be amortized using the effective interest rate method over the term of the debt and recorded as an interest expense.

As of September 30, 2020, the deferred debt issuance costs were $0.2 million and are included in other non-current assets on the Company’s condensed consolidated balance sheets.

10. Regeneron License and Collaboration Arrangement

Agreement Terms

On July 29, 2016, the Company entered into a License and Collaboration Agreement with Regeneron Pharmaceuticals, Inc. (“Regeneron”) to develop engineered immune-cell therapeutics using the universal immune cell therapies platform (the “Regeneron Agreement”).

The Company received a non-refundable upfront payment of $25.0 million from Regeneron upon execution of the Regeneron Agreement, and has received an aggregate of $20.0 million of additional payments for research funding from Regeneron under the Regeneron agreement. In addition, Regeneron may have to pay the Company additional amounts in the future consisting of up to an aggregate of $100 million of option exercise fees, in each case as specified in the Regeneron Agreement. Regeneron must also pay the Company high single digit royalties as a percentage of net sales for ICPs to targets for which it has exclusive rights, and low single digit royalties as a percentage of net sales on any non-ICP product comprising a target generated by the Company through the use of Regeneron’s proprietary mice. The Company must pay Regeneron mid-single to low-double digit royalties as a percentage of net sales of ICPs to targets for which the Company has exercised exclusive rights, and low-to mid-single digit royalties as a percentage of net sales of targeting moieties generated from the Company’s license to use Regeneron’s proprietary mice. Royalties are payable until the longer of the expiration or invalidity of the licensed patent rights or 12 years from first commercial sale.

Revenue Recognition

For revenue recognition purposes, the Company determined that the duration of the contract is the same as the research term of five (5) years beginning on the execution of the Regeneron Agreement on July 29, 2016. The contract duration is defined as the period during which parties to the contract have present and enforceable rights and obligations. The Company determined that Regeneron faces significant in-substance penalties were it to terminate the Regeneron Agreement prior to the end of the research.

At contract inception, the Company determined a transaction price of the Regeneron Agreement consisting of the $25.0 million upfront payment and the aggregate research funding fees payable over the research term. In order to determine the transaction price, the Company evaluated all the payments to be received during the duration of the contract. Per the terms of the original Regeneron Agreement prior to the amendment effective from July 2019, the research funding fees were payable merely due to the passage of time and therefore did not represent a variable consideration. After the amendment became effective in July 2019, certain of these fees became contingent upon meeting certain development and regulatory milestones. Therefore, the Company concluded that after the amendment such potential payments became variable consideration. The receipt of the variable consideration was subject to substantial uncertainty and was therefore excluded from the transaction price upon the effective date of the amendment. As a result, during the three months ended September 30, 2019, the Company recorded $6.6 million as a reduction to cumulative revenue recognized prior to the amendment effective date. The Company will re-evaluate the transaction price if there is a significant change in facts and circumstances at least at the end of each reporting period. The Company increased the transaction price by $10.0 million in June 2020 when it achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement, resulting in a recognition of cumulative revenue of $5.0 million during the three months ended June 30, 2020.

For the three months ended September 30, 2020 and 2019, the Company recognized $3.0 million and $(7.0) million of license and collaboration revenue, respectively. For the nine months ended September 30, 2020 and 2019, the Company recognized $12.5 million and $(1.0) million of license and collaboration revenue, respectively.

The following tables present changes in the Company’s contract liabilities for the three and nine months ended September 30, 2020 and 2019 (in thousands):

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Nine Months Ended September 30, 2020	Balance at beginning of period		Additions		Additions (Deductions) (1)			Balance at end of period
Contract asset	$	—	$	10,000	$	(10,000	)	$	—
Contract liability	$	21,883	$	10,000	$	(12,493	)	$	19,390

Nine Months Ended September 30, 2019	Balance at beginning of period		Additions		Additions (Deductions) (1)		Balance at end of period
Contract liability	$	22,878	$	—	$	974	$	23,852

⁽¹⁾ Additions (deductions) to contract liabilities relate to deferred revenue derecognized (recognized) as revenue during the reporting period.

Contract assets are reflected as accounts receivable—related party on the condensed consolidated balance sheet. The Company achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement in June 2020 and was entitled to receive a payment of $10.0 million from Regeneron. The Company received the payment from Regeneron in July 2020.

Contract liabilities related to the Regeneron Agreement of $19.4 million and $23.9 million as of September 30, 2020 and 2019, respectively, which was comprised of the $25.0 million upfront payment and additional $5.0 million research funding fees in each of 2017 and 2018, and $10.0 million for achievement of the milestone for the selection of a clinical candidate to the second collaboration target in June 2020, less $25.6 million and $11.1 million of cumulative license and collaboration revenue recognized from the inception of the Regeneron Agreement as of September 30, 2020 and 2019, respectively, and will be recognized as the combined performance obligation is satisfied.

11. License, Funding and Other Agreements Related to the CVR

Novartis License Agreement

On March 23, 2017, resTORbio entered into an exclusive license agreement with Novartis International Pharmaceutical Ltd. (“Novartis”). Under the agreement, Novartis granted resTORbio an exclusive, field-restricted, worldwide license, to certain intellectual property rights owned or controlled by Novartis, to develop, commercialize and sell one or more therapeutic products comprising RTB101 or RTB101 in combination with everolimus in a fixed dose combination. The exclusive field under the license agreement is for the treatment, prevention and diagnosis of disease and other conditions in all indications in humans and animals.

The agreement may be terminated by either party upon a material breach of obligation by the other party that is not cured with 60 days after written notice. resTORbio may terminate the agreement in its entirety or on a product-by-product or country-by-country basis with or without cause with 60 days’ prior written notice.

Novartis may terminate the portion of the agreement related to everolimus if resTORbio fails to use commercially reasonable efforts to research, develop and commercialize a product utilizing everolimus for a period of three years. Novartis may terminate the license agreement upon resTORbio’s bankruptcy, insolvency, dissolution or winding up.

As consideration for the license, resTORbio is required to pay up to an aggregate of $4.3 million upon the satisfaction of clinical milestones, up to an aggregate of $24 million upon the satisfaction of regulatory milestones for the first indication approved, and up to an aggregate of $18 million upon the satisfaction of regulatory milestones for the second indication approved. In addition, resTORbio is required to pay up to an aggregate of $125 million upon the satisfaction of commercial milestones, based on the amount of annual net sales. resTORbio is also required to pay tiered royalties ranging from a mid-single digit percentage to a low-teen digit percentage on annual net sales of products. These royalty obligations last on a product-by-product and country-by-country basis until the latest of (i) the expiration of the last valid claim of a Novartis patent covering a subject product, (ii) the expiration of any regulatory exclusivity for the subject product in a country, or (iii) the 10^th anniversary of the first commercial sale in the country, and are subject to a reduction after the expiration of the last valid claim of a Novartis patent or the introduction of a generic equivalent of a product in a country.  As of September 30, 2020, none of the remaining clinical milestones, regulatory milestones, sales milestones, or royalties had been reached or were probable of achievement.

National Institute of Health

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In May 2019, the Company was awarded a 5-year grant for up to $1.5 million from the National Institutes of Health (the “NIH”) to study RTB101 and the regulation of antiviral immunity in the elderly. The Company is entitled to use the award solely to conduct the research. The Company is solely responsible for commencing and conducting the research and will furnish periodic progress updates to the NIH throughout the term of the award. After completing the research, the Company must provide the NIH with a formal report describing the work performed and the results of the research.

For funds received under the NIH funding agreement, the Company recognizes a reduction in research and development expenses in an amount equal to the qualifying expenses incurred in each period up to the amount funded by the NIH. Qualifying expenses incurred by the Company in advance of funding by the NIH are recorded in the consolidated balance sheets as other current assets. As of September 30, 2020, $0.7 million qualifying expenses have been incurred and $0.7 million have been funded by the NIH.  

Contingent Value Rights Agreement

In connection with the Merger, the Company entered into a Contingent Value Rights Agreement (the “CVR Agreement”) with Computershare Inc. and Computershare Trust Company, N.A. as joint rights agent. Per the terms of the Merger, each holder of resTORbio common stock as of immediately prior to the completion of the Merger is entitled to one contractual contingent value right (“CVR”), subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the effective time of the Merger. The CVR holders are entitled to receive net proceeds from the commercialization, if any, received from a third-party commercial partner of RTB101 for a COVID-19 related indication. The total fees and expenses of the Company’s clinical trials for a COVID-19 related indication of RTB101 is limited to $3.0 million under the CVR Agreement.

12. Commitments and Contingencies

Operating Leases

The Company recognizes rent expense on a straight-line basis over the lease period. Rent expense recognized under all leases was $0.2 million and $0.6 million for the three months and nine months ended September 30, 2020, respectively. Rent expense recognized under all leases was $0.2 million and $0.5 million for the three months and nine months ended September 30, 2019, respectively.

The future minimum lease payments under all non-cancelable operating lease obligations as of September 30, 2020 were as follows (in thousands):

2020 (remaining 3 months)	$	1,018
2021		4,124
2022		3,560
2023		3,428
2024		3,525
2025 and thereafter		17,371
Total	$	33,026

In conjunction with the Menlo Park lease agreement, the Company issued a cash-collateralized letter of credit in lieu of security deposit of $0.2 million. In addition, the Company issued a cash-collateralized letter of credit for $4.1 million in 2018 for the new office lease in Redwood City. The Company also maintains a letter of credit of $0.2 million for the benefit of the landlord in connection with the Company’s office lease in Boston, Massachusetts. All cash amounts are recorded as restricted cash on the condensed consolidated balance sheet as of September 30, 2020 and December 31, 2019.

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Litigation

As of September 30, 2020, five of the seven lawsuits filed against the Company, its directors, Former Adicet, and/or Merger Sub in connection with the Merger had been dismissed. The Company has accrued $0.2 million as of September 30, 2020, for the resolution of claims in connection with the lawsuits. with the Merger, eight putative class action lawsuits have been filed against the Company, its directors, Former Adicet, and Merger Sub.   

13. Redeemable Convertible Preferred Stock (converted to Common Stock)

As of December 31, 2019, redeemable convertible preferred stock consists of the following (in thousands, except per share and share amounts):

	Shares Authorized		Original Issue Price		Shares Issued and Outstanding		Carrying Value		Liquidation Preference		Common Stock Issued Upon Conversion (1)
Series A		37,104,185	$	1.20		37,104,185	$	35,960	$	44,525		4,600,920
Series A-1		629,633		1.20		629,633		447		756		78,074
Series A-2		2,428,688		1.20		2,428,688		1,749		2,914		301,157
Series B		59,200,938		1.40		57,004,415		75,927		80,000		7,068,520
		99,363,444				97,166,921	$	114,083	$	128,195		12,048,671

(1) Adjusted to reflect the Exchange Ratio.

Following the closing of the Merger, all outstanding shares of the redeemable convertible preferred stock converted into 12,048,671 shares of common stock and the related carrying value was reclassified to common stock and additional paid-in capital. There were no shares of redeemable convertible preferred stock outstanding as of September 30, 2020.

14. Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants

In connection with Series B redeemable convertible preferred stock financing transactions, we issued to our financial advisor warrants to purchase 1,781,387 shares of our Series B redeemable convertible preferred stock at an exercise price of at $1.4034 per share. These warrants will terminate at the earlier of seven-year anniversary from the issuance date and a liquidation of the company. Additionally, in connection with the entrance into the Loan Agreement, the Company issued Pacific Western Bank a warrant to purchase shares of its Series B redeemable convertible preferred stock (see Note 9). These warrants together are referred to as Series B Warrants.

Prior to the Merger, the Company classified the Series B Warrants as a liability on its consolidated balance sheet because the warrants are freestanding financial instruments that may have required the Company to transfer assets upon exercise. The liability associated with each of these warrants was initially recorded at fair value upon the issuance date of each warrant and was subsequently remeasured to fair value as a component of other income (expense), net in the consolidated statement of operations and comprehensive loss. Upon the closing of the Merger (see Note 3), pursuant to the Merger Agreement, all of the outstanding redeemable convertible preferred stock was converted to shares of the Company’s common stock and the Series B Warrants converted to warrants for the purchase of the shares of the Company’s common stock. The Company assessed the features of the warrants and determined that they qualify for classification as permanent equity upon the closing of the Merger. Accordingly, the Company remeasured the warrants to fair value upon the closing of the Merger, which was $2.9 million on September 15, 2020. Upon the closing of the Merger, the warrant liability was reclassified to additional paid-in capital. The fair value of the warrants to purchase shares of the Company’s common stock was equal to the fair value of the Series B Warrants on the Merger date. Accordingly, no incremental expense was recognized at the Merger date.

The Series B Warrants had a fair value of $1.9 million as of December 31, 2019. The change in fair value of $0.9 million and $0.8 during the three and nine months ended September 30, 2020, respectively, was recorded as a component of other income (expense), net in the condensed consolidated statements of operations and comprehensive loss. The change in fair value of $0.1 million and $0.1 during the three and nine months ended September 30, 2019, respectively, was recorded as a component of other income (expense), net in the condensed consolidated statements of operations and comprehensive loss.

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The redeemable convertible preferred stock warrant liability was valued using the following assumptions under the Black-Scholes option-pricing model:

	September 14, 2020 (Conversion Date)			April 28, 2020 (Issuance Date)			December 31, 2019
Stock price	$	16.59		$	11.61		$	11.32
Expected term (years)	5.86 - 6.62				7.00		6.57 - 6.74
Expected volatility	81.1% - 82.1%				91.17	%	82.1% - 93.3%
Risk-free interest rate	0.35% - 0.42%				0.52	%	1.80% - 1.81%
Dividend yield		0	%		0	%		0	%

The following table provides a roll forward of outstanding warrants:

	Number of warrants			Weighted Average Exercise Price		Weighted Average Contractual Term (Years)
Outstanding and exercisable warrants to    purchase preferred shares as of    December 31, 2019		1,781,387		$	1.4034		6.64
Issued		128,260
Converted to warrants for the purchase of    common stock and adjusted for the Exchange    Ratio and Reverse Stock Split		(1,672,854	)
Outstanding and exercisable warrants to purchase common stock as of September    30, 2020		236,793		$	11.3177		5.94

As of September 30, 2020, the Company’s outstanding warrants to purchase shares of common stock, including the New PacWest Warrant, consisted of the following:

Issuance Date	Number of Shares of Common Stock Issuable		Exercise Price		Classification	Expiration Date
September 15, 2020		101,610	$	11.3177	Equity	July 25, 2026
September 15, 2020		30,924	$	11.3177	Equity	August 21, 2026
September 15, 2020		77,312	$	11.3177	Equity	September 19, 2026
September 15, 2020		11,044	$	11.3177	Equity	September 26, 2026
September 15, 2020		15,903	$	11.3177	Equity	April 28, 2027
		236,793

As of December 31, 2019, the Company’s outstanding warrants to purchase shares of redeemable convertible preferred stock (which converted into warrants to purchase common stock upon close of the Merger) consisted of the following (not adjusted for the Exchange Ratio):

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Warrant Name	Issuance Date	Number of Shares of Preferred Stock Issuable		Exercise Price		Exercisable for	Classification	Expiration Date
Series B warrants	July 25, 2019		819,438	$	1.4034	Series B	Liability	July 25, 2026
Series B warrants	August 21, 2019		249,394	$	1.4034	Series B	Liability	August 21, 2026
Series B warrants	September 19, 2019		623,486	$	1.4034	Series B	Liability	September 19, 2026
Series B warrants	September 26, 2019		89,069	$	1.4034	Series B	Liability	September 26, 2026
			1,781,387

15. Stock-based Compensation

The Company had reserved common stock for future issuance as follows:

	September 30, 2020		December 31, 2019
Conversion of redeemable convertible preferred stock (as converted to    common stock)		—		12,048,671
Conversion of additional authorized and unissued redeemable    convertible preferred stock		—		51,506
Stock options available for future grant		2,098,174		653,136
Stock options issued and outstanding		3,269,399		1,860,646
Redeemable convertible preferred stock warrants issued and outstanding		—		220,890
Common stock warrants issued and outstanding		226,191		—
Total		5,593,764		14,834,849

A summary of stock option activity for the nine months ended September 30, 2020 is set forth below:

	Ongoing Awards
	Number of Shares Available for Grant			Number of Shares Underlying Outstanding Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2019		653,136			1,860,646		$	4.05		8.53	$	5,812
Assumed as part of the Merger		2,707,144			81,370		$	8.39
Options granted		(1,517,446	)		1,713,344		$	16.06
Options exercised		—			(123,141	)	$	1.57
Options forfeited or cancelled		255,340			(262,820	)	$	4.80
Outstanding, September 30, 2020		2,098,174			3,269,399		$	10.49		7.73		11,780
Shares exercisable, September 30, 2020					1,195,101		$	4.20		4.95		9,246
Vested and expected to vest, September 30, 2020					3,269,399		$	10.49		7.73		11,780

Total stock-based compensation expense recognized was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Research and development	$	951	$	54	$	1,125	$	191
General and administrative		2,015		337		2,491		674
Total stock-based compensation	$	2,966	$	391	$	3,616	$	865

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Summary of Plans

Upon completion of the Merger with resTORbio on September 15, 2020, Former Adicet’s 2014 Share Option Plan (the “2014 Plan”), Former Adicet’s 2015 Stock Incentive Plan (the “2015 Plan”), resTORbio’s 2017 Stock Incentive Plan (the “2017 Plan”), resTORbio’s 2018 Stock Incentive Plan (the “2018 Plan”) and resTORbio’s 2018 Employee Stock Purchase Plan (the “2018 ESPP”, and, collectively with the 2014 Plan, the 2015 Plan, the 2017 Plan and the 2018 Plan, the “Plans”) were assumed by the Company. The Plans are administered by the Board of Directors or, at the discretion of the Board of Directors, by a committee of the Board of Directors. No further shares will be issued from the 2014 Plan or 2017 Plan. The exercise prices, vesting and other restrictions are determined at the discretion of the Board of Directors, or its committee if so delegated, except that the exercise price per share of stock options may not be less than 100% of the fair market value of the share of common stock on the date of grant and the term of the stock option may not be greater than ten years. Incentive stock options granted to employees and restricted stock awards granted to employees, officers, members of the Board of Directors, advisors, and consultants of the Company typically vest over four years. Non-statutory options granted to employees, officers, members of the Board of Directors, advisors, and consultants of the Company typically vest over three or four years. Shares that are expired, terminated, surrendered or canceled under the Plans without having been fully exercised will be available for future awards. In addition, shares of common stock that are tendered to the Company by a participant to exercise an award are added to the number of shares of common stock available for the grant of awards.

The 2017 Plan and 2018 Plan

In 2017, resTORbio adopted the 2017 Plan. In connection with resTORbio’s initial public offering completed in January 2018, the resTORbio Board adopted and resTORbio’s stockholders approved the 2018 Plan. The 2018 Plan provides that the number of shares reserved and available for issuance under the plan will automatically increase each January 1, beginning on January 1, 2019, by 4% of the outstanding number of shares of resTORbio’s common stock on the immediately preceding December 31 or such lesser number of shares as determined by the Board.

Since the date of effectiveness of the 2018 Plan, resTORbio has not and will not grant any further awards under the 2017 Plan. However, any shares of common stock subject to awards under the 2017 Plan that expire, terminate, or otherwise are surrendered, canceled, forfeited or repurchased without having been fully exercised or resulting in any common stock being issued will become available for issuance under the 2018 Plan.

As of September 30, 2020, the number of shares of common stock available for grant under the 2017 and 2018 Plan is 1,462,006. As of September 30, 2020, an aggregate of 1,326,508 shares of common stock were issuable upon the exercise of outstanding stock options under the 2017 Plan and 2018 Plans at a weighted average exercise price of $15.64 per share.

The 2014 Plan and 2015 Plan

At the effective time of the Merger, each outstanding and unexercised option to purchase Former Adicet’s common stock, whether vested or unvested, pursuant to the 2015 Plan  and a subset of options issued pursuant to the 2014 Plan were converted into options to purchase a number of shares of the Company’s common stock based on the Exchange Ratio. Former Adicet warrants with rights to acquire Former Adicet capital stock were converted into rights to acquire a certain number of shares of the Company’s common stock based on the Exchange Ratio, subject to the terms of and adjustments in the merger agreement.

As of September 30, 2020, the number of shares of common stock available for grant under the 2017 and 2018 Plan is 636,168. As of September 30, 2020, an aggregate of 1,677,979 shares of Former Adicet common stock were issuable upon the exercise of outstanding stock options under the 2015 plan at a weighted average exercise price of $6.14 per share and an aggregate of 69,014 shares of Former Adicet common stock were issuable upon the exercise of outstanding stock options under the 2014 Plan at a weighted average exercise price of $1.27 per share.

Since the date of effectiveness of the Merger, the Company has not and will not grant any further awards under the 2014 Plan.

2018 Employee Stock Purchase Plan

The resTORbio Board adopted and resTORbio’s stockholders approved the 2018 ESPP, which became effective on the date immediately preceding the date on which resTORbio’s registration statement of Form S-1 became effective. The

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2018 ESPP enables eligible employees to purchase shares of resTORbio’s common stock at a discount. The number of shares of common stock originally reserved for issuance under the 2018 ESPP were 39,290 shares. The 2018 ESPP provides that the number of shares reserved and available for issuance will automatically increase each January 1, beginning on January 1, 2019 and increasing each January 1 thereafter through January 1, 2028, by the least of (i) 1% of the outstanding number of shares of resTORbio’s common stock on the immediately preceding December 31; (ii) 77,703 shares or (iii) such number of shares as determined by the ESPP administrator. On January 1, 2019, as a result of the foregoing evergreen provision, the number of shares of common stock available for issuance under the 2018 ESPP automatically increased from 39,290 to 79,369 shares. On January 1, 2020, as a result of the foregoing evergreen provision, the number of shares of common stock available for issuance under the 2018 ESPP automatically increased from 79,369 to 131,432 shares. No shares have been issued under the 2018 ESPP during the three and six months ended June 30, 2020.

Inducement Grant

As of September 30, 2020, an aggregate of 195,898 shares of were issuable upon the exercise of inducement grants of stock options approved by the Company in accordance with Nasdaq listing Rule 5635(c)(4) at a weighted average exercise price of $16.11 per share.

Former CEO’s Stock Option Modification

In connection with the Merger, the stock options granted to Dr. Singhal were modified (refer to Note 3 for details), which resulted in acceleration and recognition of the stock compensation expense of $0.6 million during the quarter ended September 30, 2020. The modification also resulted in incremental stock compensation expense of $0.1 million that will be recognized through May 7, 2021 as the Company determined that Dr. Singhal will be providing substantial services under the Independent Contractor Agreement with Dr. Singhal through that date.

Former CEO’s Performance Option

On July 14, 2020, the Company’s Board of Directors confirmed that the conditions for Dr. Singhal’s Second Target Milestone Option (as defined in Dr. Singhal’s employment agreement with the Company) had been fulfilled as the Company achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement. Following the Merger, on September 17, 2020, the Company’s Board of Directors granted an option to purchase 16,931 shares of the Company’s common stock at an exercise price of $16.11 per share, (i) one-third of the shares vesting on the first anniversary of May 6, 2019, (ii) one-third of the shares vesting in 12 equal monthly installments following such first anniversary, and (iii) one-third of the shares vesting in accordance with the terms of his Transition Agreement. The Company recognized $0.1 million in stock compensation expense associated with this reward during the three months ended September 30, 2020.

16. Net Loss per Share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders, which excludes unvested restricted shares and shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Net loss attributable to common stockholders	$	(14,779	)	$	(14,778	)	$	(27,720	)	$	(21,560	)
Weighted-average shares used in computing net loss    per share attributable to common shareholders,    basic and diluted		5,208,887			2,149,986			3,190,557			2,133,645
Net loss per share attributable to common stockholder,    basic and diluted	$	(2.84	)	$	(6.87	)	$	(8.69	)	$	(10.10	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the period presented because including them would have been antidilutive:

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	As of September 30,
	2020		2019
Redeemable convertible preferred stock (as converted to common stock)		—		12,048,671
Options to purchase common stock		3,269,399		1,319,600
Redeemable convertible preferred stock warrants		—		220,890
Common stock warrants		226,191		—
Total		3,495,590		13,589,161

17. Income Taxes

The Company recorded an income tax benefit of $2.7 million during the nine months ended September 30, 2020.

The income tax benefit during the nine months ended September 30, 2020 was generated as a result of the recognition of net operating loss carryback under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) which was enacted on March 27, 2020 in response to the COVID-19 pandemic and generates a refund of income taxes paid for the year ended December 31, 2017. The Company records the effect of an enacted change in a tax law in the period that includes the enactment date in accordance with ASC 740, Income Taxes.

The tax relief measures under the CARES Act for businesses include a five-year net operating loss carryback, suspension of annual deduction limitation of 80% of taxable income from net operating losses generated in a tax year beginning after December 31, 2017, changes in the deductibility of interest, acceleration of alternative minimum tax credit refunds, payroll tax relief, and a technical correction to allow accelerated deductions for qualified improvement property.

The Company maintains a full valuation allowance against its deferred tax assets other than a deferred tax liability arising from merger with resTORbio due to the Company’s history of losses as of September 30, 2020.  The deferred tax liability recorded relates to the basis difference associated with IPR&D.

18. Related Party

As of September 30, 2020, and December 31, 2019, Regeneron owned 883,568 shares of the Company’s common stock, respectively. Regeneron became a related party in July 2019 as a result of Series B redeemable convertible preferred stock financing. For the three and nine months ended September 30, 2020 and 2019, the Company recorded revenue of $3.0 million, $12.5 million, $(7.0) million and $(1.0) million, respectively, and as of September 30, 2020, the Company recorded accounts receivable of $0 and deferred revenue of $19.4 million related to the Regeneron Agreement. See Note 10 for a discussion of the Regeneron Agreement.

19. Subsequent Events

On October 22, 2020, the U.S. Food and Drug Administration cleared the Company’s Investigational New Drug (“IND”) application for ADI-001, an allogeneic gamma delta T cell therapy expressing a chimeric antigen receptor (“CAR”) targeting CD20 for treatment of non-Hodgkin’s lymphoma (“NHL”). The active IND enables the Company to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our financial statements, accompanying notes and other financial information appearing elsewhere in this Quarterly Report on Form 10-Q. This “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contains forward-looking statements that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of certain factors. Please see “Forward-Looking Statements” for additional factors relating to such statements and see “Risk Factors” for a discussion of certain risk factors applicable to our business, financial condition and results of operations. Operating results are not necessarily indicative of results that may occur in future periods. In this “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, unless the context implies otherwise, the use of “Adicet”, and the “company” refer to Adicet Bio, Inc.

Overview

We are a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases.  Adicet is advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors and T cell receptor-like antibodies to enhance selective tumor targeting, facilitate innate and adaptive anti-tumor immune response, and improve persistence for durable activity in patients.  We believe our approach has potentially significant advantages over alpha beta T cells, which are the basis of standard CAR-T cell therapies. We are developing proprietary processes for engineering and manufacturing product candidates based on gamma delta T cells from the blood of healthy donors, resulting in high yields of cells with efficacious tumor-killing activity in preclinical studies. The potential to administer product candidates based on gamma delta T cells to patients without inducing a graft versus host immune response could mean that our products can potentially be produced as “off-the-shelf” therapies. This is in contrast to products based on alpha beta T cells, which either must be manufactured for each patient from his or her own T cells, or require significant gene editing to manufacture if the T cells are derived from donors that are unrelated to the patient. Based on what we believe is the unique potential of these cells and associated modifications, we are initially developing product candidates in oncology, both for hematological malignancies and for solid tumors. Due to certain unique properties of gamma delta T cells, we believe that our product candidates can be developed to have an inherent capacity to recognize and kill circulating tumor cells and to infiltrate and kill solid tumors. In October 2020, the United States, or U.S., Food and Drug Administration, or FDA, cleared the Company’s Investigational New Drug (IND) application for ADI-001, our lead product candidate, for the treatment of NHL. The active IND enables the Company to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients in the first quarter of 2021.  The Phase 1 study for ADI-001 will enroll up to 80 late-stage non-Hodgkin’s lymphoma patients at a number of cancer centers across the U.S. The study includes a dose finding portion followed by dose expansion cohorts to explore the activity of ADI-001 in multiple subtypes of NHL. Site initiation activities are underway and interim clinical data from this study are expected in 2021. We intend to file an IND with the FDA in late 2021 for ADI-002, our first solid tumor product candidate.

Recent Developments

Reverse Merger

On April 28, 2020, Adicet Bio, Inc. (“Former Adicet”) entered into an agreement and plan of merger with resTORbio, Inc., a Delaware corporation (“resTORbio”), and Project Oasis Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of resTORbio (“Merger Sub”), pursuant to which, subject to the satisfaction or waiver of the conditions therein, Merger Sub agreed to merge with and into Former Adicet, with Former Adicet surviving as a wholly owned subsidiary of resTORbio and changing its name to Adicet Therapeutics, Inc., (such transactions, the “Merger”). The Merger was subject to certain conditions, including the approval of resTORbio stockholders.

On September 15, 2020, we completed the Merger. In connection with the completion of the Merger, resTORbio was renamed Adicet Bio, Inc. (“Adicet Bio”). Immediately prior to the effective time of the Merger, resTORbio effected a reverse stock split of its common stock at a ratio of 1-for-7 (the “Reverse Stock Split”). At the effective time of the Merger, each outstanding share of Former Adicet’s capital stock was converted into the right to receive 0.1240 (the “Exchange Ratio”) shares of resTORbio common stock.

The business combination has been accounted for as a “reverse merger” in accordance with GAAP. Under this method of accounting, Former Adicet is deemed to be the accounting acquirer for financial reporting purposes. This determination was primarily based on the facts that, immediately following the Merger: (i) Former Adicet’s securityholders own approximately 75% of the voting rights of the combined company (on a fully-diluted basis excluding equity incentives

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available for grant); (ii) Former Adicet designated a majority (five of seven) of the initial members of the Board of Directors of the combined company; and (iii) the terms of the exchange of equity interests based on the exchange ratio at the announcement of the Merger factored in an implied premium to resTORbio’s stockholders. The composition of senior management of the combined company was determined to be a neutral factor in the accounting acquirer determination, as the combined company will leverage the expertise of the senior management of both companies. Accordingly, for accounting purposes, the business combination has been treated as the equivalent of Former Adicet issuing stock to acquire the net assets of resTORbio. As a result, as of the closing date of the Merger, the net assets of resTORbio have been recorded at their acquisition-date fair values in the financial statements of the combined entity and the reported operating results prior to the business combination will be those of Former Adicet. Subsequent to the closing of the Merger, the reported operating results will reflect those of the combined organization. In addition, transaction costs incurred by Former Adicet in connection with the business combination have been expensed as incurred. Our common stock remained listed on the Nasdaq Stock Market, with trading having commenced on a post-Merger and post-Reverse Stock Split basis and under the new name as of September 16, 2020. The trading symbol also changed on that date from “TORC” to “ACET.”

Impact of COVID-19 Pandemic

In December 2019, a novel strain of coronavirus, COVID-19, was reported in China. Since then, COVID-19 has spread globally. The spread of COVID-19 from China to other countries has resulted in the World Health Organization, or WHO, declaring the outbreak of COVID-19 as a “pandemic,” or a worldwide spread of a new disease, on March 11, 2020. Many countries around the world have imposed quarantines and restrictions on travel and mass gatherings to slow the spread of the virus and have closed non-essential businesses.

As local jurisdictions continue to put restrictions in place, our ability to continue to operate our business may also be limited. Such events may result in a period of business, supply and drug product manufacturing disruption, and in reduced operations, any of which could materially affect our business, financial condition and results of operations. In response to the COVID-19 pandemic, we implemented remote working and thus far has not experienced a significant disruption or delay in our operations as it relates to the clinical development of our drug candidates. However, we anticipate that the impact of the COVID-19 pandemic may create difficulties in our clinical trials for a variety of reasons, including future regulations regarding, or the inability or unwillingness of patients to, travel to participate in clinical trials, or to participate in clinical trials that are administered in medical facilities that also treat COVID-19, potential delays in the FDA’s review and approval processes and/or shortages of medical supplies that may force medical professionals to focus on non-clinical procedures, including treatment of COVID-19. The duration and ultimate impact of the COVID-19 pandemic on clinical trials generally, and on our trials particularly, is currently unknown.

In addition, the spread of COVID-19, which has caused a broad impact globally, may materially affect us economically. While the potential economic impact brought by, and the duration of, COVID-19 may be difficult to assess or predict, a widespread pandemic could result in significant disruption of global financial markets, reducing our ability to access capital, which could in the future negatively affect our liquidity. In addition, a recession or market correction resulting from the spread of COVID-19 could materially affect our business. Possible effects may also include absenteeism in our labor workforce, unavailability of products and supplies used in operations, and a decline in value of assets held by us, including inventories, property and equipment, and marketable debt securities.

Loan Agreement

On April 28, 2020, we entered into a Loan and Security Agreement with Pacific Western Bank for a term loan not exceeding $12.0 million (the “Loan Agreement”) to finance leasehold improvements for our new corporate headquarters in Redwood City, California and other purposes permitted under the Loan Agreement, with an interest rate equal to the greater of 0.25% above the Prime Rate (as defined in the Loan Agreement) or 5.00%. In connection with the entrance into the Loan Agreement, we issued Pacific Western Bank a warrant to purchase shares of our Series B redeemable convertible preferred stock (described below) at an exercise price of $1.4034 per share. Such warrant was initially exercisable for 42,753 shares of our Series B redeemable convertible preferred stock. Upon the closing of the Merger, it was exchanged for a warrant to purchase 5,301 shares of common stock at an exercise price of $11.32 per share and shall be exercisable for an additional number of shares of common stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 15,903 shares of common stock). The Loan Agreement contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets, limitations on the incurrence of additional debt and other requirements. As of the date of this Quarterly Report on Form 10-Q, we were in compliance with such covenants and had no indebtedness outstanding under the Loan Agreement.

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Financial Operations Overview

Revenue

We have no products approved for commercial sale and do not expect to generate revenue from product sales unless and until we successfully complete development and obtain regulatory approval for our product candidates, which we expect will not be for at least several years, if ever. Our revenues to date are generated from our License and Collaboration Agreement with Regeneron Pharmaceuticals, Inc. (“Regeneron”) (the “Regeneron Agreement”). The primary purpose of the Regeneron Agreement is to establish a strategic relationship to identify and validate appropriate targets and work together to develop a pipeline of engineered immune cell products (“Collaboration ICPs”) for the selected targets. The Regeneron Agreement provides for the following: (i) licenses to our technology, (ii) research and development services, (iii) services or obligations in connection with participation in the research committee, (iv) information sharing, and (v) manufacturing services to manufacture of Collaboration ICPs for the research programs. The Regeneron Agreement provides Regeneron an option to obtain an exclusive, royalty-bearing development and commercial license under our intellectual property to develop and commercialize the optioned Collaboration ICPs ready for an IND submission.

We received a non-refundable upfront payment of $25.0 million from Regeneron upon execution of the Regeneron Agreement on July 29, 2016 and have received an aggregate of $20.0 million of additional payments for research funding from Regeneron as of September 30, 2020. In addition, Regeneron may have to pay us additional amounts in the future consisting of up to an aggregate of $100.0 million of option exercise fees, in each case as specified in the Regeneron Agreement. Regeneron must also pay us high single digit royalties as a percentage of net sales for ICPs to targets for which it has exclusive rights and low single digit royalties as a percentage of net sales on any non-ICP product comprising a target generated by us through the use of Regeneron’s proprietary mice. We must pay Regeneron mid-single to low double digit royalties as a percentage of net sales of ICPs to targets for which we have exercised exclusive rights, and low to mid-single digit royalties as a percentage of net sales of targeting moieties generated from our license to use Regeneron’s proprietary mice. Royalties are payable until the longer of the expiration or invalidity of the licensed patent rights or 12 years from first commercial sale.

We use a cost-based input method to measure proportional performance and to calculate the corresponding amount of revenue to recognize under the Regeneron Agreement. In applying the cost-based input method of revenue recognition, we use actual costs incurred relative to budgeted costs to fulfill the combined performance obligation. Revenue is recognized based on actual costs incurred as a percentage of total budgeted costs as we complete our performance obligations over the research term of five years. A cost-based input method of revenue recognition requires us to estimate costs to complete our performance obligations, which requires significant judgment to evaluate assumptions related to cost estimates. The cumulative effect of revisions to estimated costs to complete our performance obligations is recorded in the period in which changes are identified and amounts can be reasonably estimated.

Operating Expenses

Research and Development Expenses

Research and development expenses, which consist primarily of costs incurred in connection with the development of our product candidates, are expensed as incurred. Research and development expenses consist primarily of:

• employee related costs, including salaries, benefits and stock-based compensation expenses for research and development employees;

• costs incurred under agreements with consultants, contract manufacturing organizations (“CMOs”), and contract research organizations (“CROs”);

• lab materials, supplies, and maintenance of equipment used for research and development activities; and

• allocated facility-related costs, such as rent, utilities, insurance, repairs and maintenance, depreciation and amortization, information technology costs and general support services.

We do not allocate our costs by product candidate, as a significant amount of research and development expenses are not tracked by product candidate, and we believe the allocation of such costs would be arbitrary and would not provide a meaningful assessment as we have used our employee and infrastructure resources across multiple product candidate research and development programs.

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We are focusing substantially all of our resources on the development of our product candidates. At this time, we cannot reasonably estimate or know the nature, timing and estimated costs of the efforts that will be necessary to complete the development of our product candidates. We are also unable to predict when, if ever, material net cash inflows will commence from sales of our product candidates. The duration, costs, and timing of clinical trials and development of our product candidates will depend on a variety of factors, including:

• the scope, rate of progress and expense of clinical trials and other research and development activities;

• clinical trial results;

• uncertainties in clinical trial enrollment rate or design;

• significant and changing government regulation;

• the timing and receipt of any regulatory approvals;

• the FDA’s or other regulatory authority’s influence on clinical trial design;

• establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers;

• commercializing product candidates, if and when approved, whether alone or in collaboration with others;

• obtaining and maintaining patent and trade secret protection and regulatory exclusivity for product candidates;

• continued applicable safety profiles of the products following approval; and

• retention of key research and development personnel.

A change in the outcome of any of these variables with respect to the development of a product candidate could significantly change the costs, timing and viability associated with the development of that product candidate. For example, if the FDA, or another regulatory authority, were to require us to conduct clinical trials beyond those that it currently anticipates will be required for the completion of clinical development of a product candidate, or if we experience significant delays in enrollment in any of our clinical trials, we could be required to expend significant additional financial resources and time on the completion of clinical development. Furthermore, we are unable to predict when or if our product candidates will receive regulatory approval with any certainty.

We are focusing substantially all of our resources on the development of our product candidates. We expect our research and development expenses to increase substantially during the next few years, as we seek to initiate clinical trials for our product candidates, complete our clinical program, pursue regulatory approval of our product candidates and prepare for a possible commercial launch. Predicting the timing or the cost to complete our clinical program or validation of our commercial manufacturing and supply processes is difficult and delays may occur because of many factors, including factors outside of our control. For example, if the FDA or other regulatory authorities were to require us to conduct clinical trials beyond those that we currently anticipate, or if we experience significant delays in enrollment in any of our clinical trials, we could be required to expend significant additional financial resources and time on the completion of clinical development. Furthermore, we are unable to predict when or if our product candidates will receive regulatory approval with any certainty.

General and Administrative Expenses

General and administrative expenses consist principally of payroll and personnel expenses, including salaries and bonuses, benefits and stock-based compensation expenses, professional fees for legal, consulting, accounting and tax services, allocated overhead expenses, including rent, equipment, depreciation, information technology costs and utilities, and other general operating expenses not otherwise classified as research and development expenses.

We anticipate that our general and administrative expenses will increase for the foreseeable future due to anticipated expenses related to the merger and as a result of operating as a public company, including expenses related to personnel costs, expanded infrastructure and higher consulting, legal and accounting services costs associated with complying with the applicable Nasdaq and SEC requirements, investor relations costs and director and officer insurance premiums.

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Interest Income

Interest income consists primarily of interest income earned on our cash and cash equivalents and marketable debt securities.

Interest Expense

Interest expense consists primarily of the non-cash amortization of costs incurred in connection with the term loan agreement entered into in April 2020.

Other Income, Net

Other income, net primarily consists of changes in the fair value of our redeemable convertible preferred stock tranche liability and redeemable convertible preferred stock warrant liability prior to their conversion to warrants to purchase common stock upon closing of the Merger.

Results of Operations

Comparison of the Three Months Ended September 30, 2020 and 2019

The following table summarizes our results of operations for the periods indicated (in thousands, except percentages):

	Three Months Ended September 30,
	2020			2019			Change			% Change
Revenue – related party	$	3,028		$	(7,047	)	$	10,075			143	%
Operating expenses
Research and development		8,942			6,331			2,611			41	%
General and administrative		7,741			1,847			5,894			319	%
Total operating expenses		16,683			8,178			8,505			104	%
Loss from operations		(13,655	)		(15,225	)		1,570			-10	%
Interest income		153			276			(123	)		-45	%
Interest expense		(50	)		—			(50	)		100	%
Other income (expense), net		(1,224	)		171			(1,395	)		-816	%
Loss before income tax benefit		(14,776	)		(14,778	)		2			0	%
Income tax expense		3			—			3			100	%
Net loss	$	(14,779	)	$	(14,778	)	$	(1	)		0	%

Revenue

Revenue increased by $10.1 million, or 143%, during the three months ended September 30, 2020 compared to the three months ended September 30, 2019 resulting from the increase in revenue recognized under the Regeneron Agreement. The increase in revenue recognized under the Regeneron Agreement for the three months ended September 30, 2020 was primarily due to the following reasons:

• In April 2019, we executed an amendment to the Regeneron Agreement, according to which the future research program fees that were due on the third and fourth anniversaries of the Regeneron Agreement were replaced with payments based on achievement of certain development and regulatory milestones. After the amendment became effective in July 2019, these payments were accounted for as variable consideration and were excluded from the transaction price due to substantial uncertainties related to achieving the milestones and, as a result, earning such payments. This change in the Agreement resulted in a decrease in the cumulative revenue recognized resulting in a reversal of revenue in the third quarter of 2019 of $6.6 million.

• In the third quarter of 2019, the total estimated costs of research and development expenses to fulfill the obligations under the Regeneron Agreement were increased primarily due to updated estimated CMO and CRO costs, including additional costs for adding second source providers. This change in the estimated

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costs also resulted in a decrease in the cumulative revenue amount recognized under the Regeneron Agreement resulting in a reversal of revenue in the third quarter of 2019. 

Research and development

	Three Months Ended September 30,
	2020		2019
Payroll and personnel expenses(1)	$	4,698	$	2,813
Costs incurred under agreements with consultants, CMOs, and CROs		2,119		1,601
Lab materials, supplies, and maintenance of equipment used for research    and development activities		1,312		1,239
Other research and development expenses(2)		813		678
Total research and development expenses	$	8,942	$	6,331

(1) Employee related costs, including salaries, benefits, bonuses, and stock-based compensation expenses for research and development employees.

(2) Allocated facility-related costs, such as rent, utilities, insurance, repairs and maintenance, depreciation and amortization, information technology costs and general support services

Research and development expenses increased by $2.6 million, or 41%, during the three months ended September 30, 2020 compared to the three months ended September 30, 2019. The increase in research and development expenses was primarily due to an increase of $1.9 million in payroll and personnel expenses, including salaries, benefits, bonuses and stock-based compensation expenses due to increases in headcount of employees involved in research and development activities, an increase of $0.9 million in fees incurred for CROs and CMOs costs due to initiating and ramping up manufacturing and preclinical development activities related to our first product candidate offset by decrease in costs for other consultants by $0.3 million, and an increase of $0.1 million in allocated facility-related costs and other general support services and laboratory materials, supplies, and maintenance of equipment used for research and development activities. The increase in payroll and personnel expenses was due to stock compensation expense of $0.9 million attributable to post combination services recognized resulting from the modification of the outstanding in-the-money stock options and restricted stock units held by resTORbio employees, in connection with the Merger.

General and administrative

General and administrative expenses increased by $5.9 million, or 319%, during the three months ended September 30, 2020 compared to the three months ended September 30, 2019. The increase in general and administrative expenses was primarily due to an increase of $3.2 million of payroll and personnel expenses, including salaries, benefits, bonuses and stock-based compensation expenses, an increase of $2.4 million of professional fees for legal, consulting, accounting, tax and other services, and an increase of $0.3 million in facility and other expenses. The increase in payroll and personnel expenses was due to payments of $0.7 million to Dr. Singhal, the former Chief Executive Officer of Adicet in accordance with the Transition Agreement executed with him, incremental stock compensation expense of $0.7 million recognized resulting from the modification of Dr. Singhal’s stock options in connection with the Merger, stock compensation expense of $1.0 million attributable to post combination services recognized resulting from the modification of the outstanding in-the-money stock options and restricted stock units held by resTORbio employees, in connection with the Merger. The increase in professional fees was primarily due to transaction costs incurred in connection with the Merger of $2.1 million during the three months ended September 30, 2020.

Interest income

Interest income decreased by $0.1 million, or 45%, during the three months ended September 30, 2020 compared to the three months ended September 30, 2019, which was primarily attributable to the decrease in cash and cash equivalents and marketable debt securities.

Interest Expense

Interest expense increased by $0.1 million during the nine months ended September 30, 2020 as compared to the nine months ended September 30, 2019 due of the non-cash amortization of costs incurred in connection with the term loan agreement entered into in April 2020.

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Other income (expense), net

Other income (expense), net increased by $1.4 million, or 816%, during the three months ended September 30, 2020 compared to the three months ended September 30, 2019, which was primarily due to increase in other expense resulting from the change in fair value of redeemable convertible preferred stock warrant liability prior to their conversion to warrants to purchase common stock upon closing of the Merger.

Income tax expense

The Company recorded no material income tax provision for three months ended September 30, 2020 and September 30, 2019 due to the tax effect of valuation allowance against loss from operation.

Comparison of the Nine Months Ended September 30, 2020 and 2019

The following table summarizes our results of operations for the periods indicated (in thousands, except percentages):

	Nine Months Ended September 30,
	2020			2019			Change			% Change
Revenue – related party	$	12,493		$	(974	)	$	13,467			1383	%
Operating expenses:
Research and development		24,651			17,168			7,483			44	%
General and administrative		17,684			6,069			11,615			191	%
Total operating expenses		42,335			23,237			19,098			82	%
Loss from operations		(29,842	)		(24,211	)		(5,631	)		23	%
Interest income		704			561			143			25	%
Interest expense		(84	)		—			(84	)		100	%
Other income (expense), net		(1,174	)		2,091			(3,265	)		-156	%
Loss before income tax provision (benefit)		(30,396	)		(21,559	)		(8,837	)		41	%
Income tax provision (benefit)		(2,676	)		1			(2,677	)	*%
Net loss	$	(27,720	)	$	(21,560	)	$	(6,160	)		29	%

* Not meaningful

Revenue

Revenue increased by $13.5 million, or 1383%, during the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019 resulting from the increase in revenue recognized under the Regeneron Agreement. The increase in revenue recognized under the Regeneron Agreement for the nine months ended September 30, 2020 was primarily due to the following reasons:

• In April 2019, we executed an amendment to the Regeneron Agreement, according to which the future research program fees that were due on the third and fourth anniversaries of the Regeneron Agreement were replaced with payments based on achievement of certain development and regulatory milestones. After the amendment became effective in July 2019, these payments were accounted for as variable consideration and excluded from the transaction price due to substantial uncertainties related to achieving the milestones and, as a result, earning such payments. This resulted in a decrease in the cumulative revenue recognized under the Regeneron Agreement resulting in reversal of revenue during the nine months ended September 30, 2019 of $6.6 million.

• Additionally, the total estimated costs of research and development expenses to fulfill the obligations under the Regeneron Agreement have increased primarily due to updated estimated CMO and CRO costs, including additional costs for adding second source providers. This also resulted in a decrease in the cumulative revenue amount recognized under the Regeneron Agreement resulting in reversal of revenue resulting in reversal of revenue during the nine months ended September 30, 2019.

• In June 2020, the Company achieved a milestone under the Regeneron Agreement relating to the selection of a clinical candidate for ADI-002 resulting in an increase in the transaction price of the Agreement by $10.0 million resulting in recognition of cumulative catch up revenue of $5.0 million in June 2020.

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• Additionally, the proportional performance under the Regeneron Agreement measured, using a cost-based input method, was higher during the nine months ended September 30, 2020 as compared to the nine months ended September 30, 2019 due to increased research and development activities.

Research and Development

	Nine Months Ended September 30,
	2020		2019
Payroll and personnel expenses(1)	$	11,295	$	7,584
Costs incurred under agreements with consultants, CMOs, and CROs		7,595		3,652
Lab materials, supplies, and maintenance of equipment used for research    and development activities		3,374		3,968
Other research and development expenses(2)		2,387		1,964
Total research and development expenses	$	24,651	$	17,168

(1) Employee related costs, including salaries, benefits, bonuses, and stock-based compensation expenses for research and development employees.

(2) Allocated facility-related costs, such as rent, utilities, insurance, repairs and maintenance, depreciation and amortization, information technology costs and general support services

Research and development expenses increased by $7.5 million, or 44%, during the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019. The increase in research and development expenses was primarily due to an increase of $3.9 million in fees incurred for CRO and CMO costs due to initiating and ramping up manufacturing and preclinical development activities related to our first product candidate, an increase of $3.7 million in payroll and personnel expenses, including salaries, benefits, bonuses, and stock-based compensation expenses due to increases in headcount of employees involved in research and development activities, and an increase of $0.4 million in allocated facility-related costs and other general support services offset by a decrease in $0.6 million in lab materials, supplies, and maintenance of equipment used for research and development activities. The increase in payroll and personnel expenses was due to stock compensation expense of $0.9 million attributable to post combination services recognized resulting from the modification of the outstanding in-the-money stock options and restricted stock units held by resTORbio employees, in connection with the Merger.

General and administrative

General and administrative expenses increased by $11.6 million, or 191%, during the nine months ended September 30, 2020 as compared to the nine months ended September 30, 2019. The increase in general and administrative expenses was primarily due to an increase of $7.0 million of professional fees for legal, consulting, accounting, tax and other services incurred in connection with the Merger, an increase of $3.9 million of payroll and personnel expenses, including salaries, benefits, bonuses, and stock-based compensation expenses, and an increase of $0.7 million in facilities and other expenses. The increase in payroll and personnel expenses was due to payments of $0.7 million to Dr. Singhal, the former Chief Executive Officer of the Company in accordance with the Transition Agreement executed with him, incremental stock compensation expense of $0.7 million recognized resulting from the modification of Dr. Singhal’s stock options in connection with the Merger, stock compensation expense of $1.0 million attributable to post combination services recognized resulting from the modification of the outstanding in-the-money stock options and restricted stock units held by resTORbio employees, in connection with the Merger.

Interest income

Interest income increased by $0.1 million, or 25%, during the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019, which was primarily attributable to interest income from the increase in cash and cash equivalents and marketable debt securities as a result of the proceeds received from the sale of shares of Series B redeemable convertible preferred stock in the third quarter of 2019.

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Interest Expense

Interest expense increased by $0.1 million during the nine months ended September 30, 2020 as compared to the nine months ended September 30, 2019 due of the non-cash amortization of costs incurred in connection with the term loan agreement entered into in April 2020.

Other income (expense), net

Other income, net decreased by $3.3 million, or 156%, during the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019, which was primarily due to increase in other expense resulting from the change in fair value of redeemable convertible preferred stock warrant liability. Other income (expense), net for the nine months ended September 30, 2019 includes a charge for the change in fair value of the redeemable convertible preferred stock tranche liability and TRDF liability of $2.0 million.

Income tax benefit

Income tax benefit increased by $2.7 million during the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019. The income tax benefit during the nine months ended September 30, 2020 was a result of the recognition of net operating loss carryback under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) which was enacted on March 27, 2020 in response to the COVID-19 pandemic and which generated a refund of income taxes paid by us for the year ended December 31, 2017. We record the effect of an enacted change in a tax law in the period that includes the enactment date in accordance with Accounting Standards Codification (“ASC”) 740, Income Taxes.

The tax relief measures under the CARES Act for businesses include a five-year net operating loss carryback, suspension of annual deduction limitation of 80% of taxable income from net operating losses generated in a tax year beginning after December 31, 2017, changes in the deductibility of interest, acceleration of alternative minimum tax credit refunds, payroll tax relief, and a technical correction to allow accelerated deductions for qualified improvement property.

Liquidity and Capital Resources

Sources of Liquidity

Since our formation in 2014, we have funded our operations with an aggregate of $116.3 million in gross cash proceeds from the sale of redeemable convertible preferred stock and an aggregate of $45.0 million received to date from Regeneron under the Regeneron Agreement. Following the closing of the Merger, all outstanding shares of the redeemable convertible preferred stock converted into 12,048,671 shares of common stock. In September 2020, we completed a merger with resTORbio and acquired $64.1 million of cash, cash equivalents and restricted cash owned by resTORbio. As of September 30, 2020, we had cash, cash equivalents and marketable debt securities of $108.1 million.

Redeemable Convertible Preferred Stock

Series A Redeemable Convertible Preferred Stock

In August 2015, we entered into a Series A redeemable convertible preferred stock purchase agreement (the “Purchase Agreement”) with an investor (the “Investor”) to issue and sell 12,187,500 shares of our Series A redeemable convertible preferred stock at $1.20 per share (the “Series A Purchase Price”) for total gross proceeds of $14.6 million. The Purchase Agreement also provided for the issuance and sale to the Investor of an additional 12,812,500 shares of Series A redeemable convertible preferred stock at the Series A Purchase Price upon achieving certain milestone conditions (the “Milestone Closing”). Further, from and after the occurrence of the Milestone Closing, at any time prior to the earliest to occur of (A) the two year anniversary of the Milestone Closing, (B) a liquidation or deemed liquidation or (C) an initial public offering by us, the Investor had an option to purchase up to an additional 8,333,334 shares of Series A redeemable convertible preferred stock at the Series A Purchase Price (the “Additional Closing”).

In January 2016, we amended the Purchase Agreement (“the Amended Purchase Agreement”) with certain purchasers, including the Investor, to issue and sell an additional 9,015,425 shares of our Series A redeemable convertible preferred stock at the Series A Purchase Price for total gross proceeds of $10.8 million. The Amended Purchase Agreement was entered in contemplation of our acquisition of Applied Immune Technologies, Ltd. (“AIT”) that closed on the same day and as part of the purchase consideration, we issued 6,400,879 Series A redeemable convertible preferred stock shares to the former shareholders of AIT.

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Per the terms of the Amended Purchase Agreement, the number of shares of Series A redeemable convertible preferred stock to be issued and sold at the Milestone Closing and Additional Closing was reduced to 9,020,833 shares and 5,875,000 shares, respectively. In November 2018, we issued 1,118,583 shares of Series A redeemable convertible preferred stock at $1.20 per share for gross proceeds of $10.8 million in connection with the Milestone Closing. In July 2019, as part of the Series B redeemable convertible preferred stock purchase agreement (as described below), the Additional Closing liability was canceled for no consideration.

We also issued 411,892 and 67,656 shares of our Series A redeemable convertible preferred stock in connection with an amendment of a license agreement in February 2016 and February 2019, respectively.

In January 2016 and February 2016, we issued 629,633 shares of our Series A-1 redeemable convertible preferred stock and 2,428,688 shares of Series A-2 redeemable convertible preferred stock as part of the purchase consideration for AIT.

Following the closing of the Merger, all Series A, Series A-1, and Series A-2 redeemable convertible preferred stock were converted in 4,980,151 shares of our common stock.

Series B Redeemable Convertible Preferred Stock

In July 2019, we issued 37,765,426 shares of Series B redeemable convertible preferred stock at $1.4034 per share for gross proceeds of $53.0 million.

In August 2019, we issued 4,987,885 shares of Series B redeemable convertible preferred stock at $1.4034 per share for gross proceeds of $7.0 million.

In September 2019, we issued 14,251,104 of Series B redeemable convertible preferred stock at $1.4034 per share for gross proceeds of $20.0 million.

As part of the Series B redeemable convertible preferred stock purchase agreement by and among we and certain investors, including the Investor, the Investor’s option to purchase additional shares of Series A redeemable convertible preferred stock at the Series A Purchase Price was cancelled for no consideration.

In connection with Series B redeemable convertible preferred stock financing transactions, we issued to our financial advisor warrants to purchase 1,781,387 shares of our Series B redeemable convertible preferred stock at an exercise price of at $1.4034 per share. These warrants will terminate at the earlier of seven-year anniversary from the issuance date and a liquidation of the company.

Following the closing of the Merger, all Series B redeemable convertible preferred stock were converted in 7,068,520 shares of our common stock.

Loan Agreement

On April 28, 2020, we entered into a Loan and Security Agreement with Pacific Western Bank (the “Bank”) for a term loan not exceeding $12.0 million (the “Loan Agreement”) to finance leasehold improvements for our new corporate headquarters in Redwood City, California, with an interest rate equal to the greater of 0.25% above the Prime Rate (as defined in the Loan Agreement) or 5.00%. In connection with the entrance into the Loan Agreement, we issued the Bank warrant to purchase shares of our Series B redeemable convertible preferred stock at an exercise price of $1.4034 per share. Such warrant was initially exercisable for 42,753 shares of our Series B redeemable convertible preferred stock. Upon the closing of the Merger, it was exchanged for a warrant to purchase 5,301 shares of common stock at an exercise price of $11.32 per share and shall be exercisable for an additional number of shares of common stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 15,903 shares of common stock). The Loan Agreement contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets, limitations on the incurrence of additional debt and other requirements. As of the date of this Quarterly Report on Form 10-Q, we were in compliance with such covenants and had no indebtedness outstanding under the Loan Agreement.

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Future Funding Requirements

We have incurred losses since inception and have incurred losses of $27.7 million and $21.6 million for the nine months ended September 30, 2020 and 2019, respectively. As of September 30, 2020, we had an accumulated deficit of $97.4 million.

As of September 30, 2020, we had cash, cash equivalents and marketable debt securities of $108.1 million. We believe that our cash, cash equivalents and marketable debt securities will be sufficient for us to continue as a going concern for at least one year from the issuance date of our financial statements as of and for the three and nine months ended September 30, 2020 included elsewhere in this Quarterly Report on Form 10-Q. We have based these estimates on assumptions that may prove to be wrong, and we could deplete our available capital resources sooner than we expect. Because of the risks and uncertainties associated with research, development, and commercialization of product candidates, we are unable to estimate the exact amount of our working capital requirements.

All of our revenue to date is generated from the Regeneron Agreement, which is a collaboration and license agreement. We do not expect to generate any significant product revenue until we obtain regulatory approval of and commercialize any of our product candidates or enter into additional collaborative agreements with third parties, and we do not know when, or if, either will occur. We expect to continue to incur significant losses for the foreseeable future, and we expect the losses to increase as we continue the development of, and seek regulatory approvals for, our product candidates and begin to commercialize any approved products. We are subject to all of the risks typically related to the development of new product candidates, and it may encounter unforeseen expenses, difficulties, complications, delays, and other unknown factors that may adversely affect our business.

We will continue to require additional capital to develop our product candidates and fund operations for the foreseeable future. We may seek to raise capital through private or public equity or debt financings, collaborative or other arrangements with corporate sources, or through other sources of financing. We anticipate that we will need to raise substantial additional capital, the requirements for which will depend on many factors, including:

• the scope, timing, rate of progress and costs of our drug discovery efforts, preclinical development activities, laboratory testing and clinical trials for our product candidates;

• the number and scope of clinical programs we decide to pursue;

• the cost, timing and outcome of preparing for and undergoing regulatory review of our product candidates;

• the scope and costs of development and commercial manufacturing activities;

• the cost and timing associated with commercializing our product candidates, if they receive marketing approval;

• the extent to which we acquire or in-license other product candidates and technologies;

• the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims;

• our ability to establish and maintain collaborations on favorable terms, if at all;

• our efforts to enhance operational systems and our ability to attract, hire and retain qualified personnel, including personnel to support the development of our product candidates and, ultimately, the sale of our products, following FDA approval;

• our implementation of operational, financial and management systems;

• the impact of the COVID-19 pandemic on U.S. and global economic conditions that may impact our ability to access capital on terms anticipated, or at all; and

• the post-merger costs associated with being a public company.

A change in the outcome of any of these or other variables with respect to the development of any of our product candidates could significantly change the costs and timing associated with the development of that product candidate. Furthermore, our operating plans may change in the future, and it will continue to require additional capital to meet operational needs and capital requirements associated with such operating plans.

Adequate funding may not be available to us on acceptable terms or at all. Our failure to raise capital as and when needed could have a negative impact on our financial condition and our ability to pursue our business strategies. If we are

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unable to raise additional funds when needed, we may be required to delay, reduce, or terminate some or all of our development programs and clinical trials or we may also be required to sell or license to others rights to our product candidates in certain territories or indications that we would prefer to develop and commercialize ourselves. If we are required to enter into collaborations and other arrangements to supplement our funds, we may have to give up certain rights that limit our ability to develop and commercialize our product candidates or may have other terms that are not favorable to us or our stockholders, which could materially affect our business and financial condition.

See the section of this Quarterly Report on Form 10-Q titled “Risk Factors” for additional risks associated with our substantial capital requirements.

Summary Statement of Cash Flows

The following table sets forth the primary sources and uses of our cash, cash equivalents, and restricted cash for each of the periods presented below (in thousands):

	Nine Months Ended September 30,
	2020			2019
Net cash provided by (used in):
Operating activities	$	(28,207	)	$	(20,623	)
Investing activities		102,769			(42,917	)
Financing activities		36			77,068
Net increase in cash, cash equivalents    and restricted cash	$	74,598		$	13,528

Cash Flows from Operating Activities

Net cash used in operating activities was $28.2 million for the nine months ended September 30, 2020. Cash used in operating activities was primarily due to the use of funds in our operations to develop our product candidates resulting in a net loss of $27.7 million, adjusted for an increase in prepaid expenses and other current assets of $5.0 million a decrease in contract liabilities of $2.5 million, and an increase in other non-current assets of $1.6 million partially offset by non-cash charges for depreciation expense of $0.9 million, and stock-based compensation expense of $3.6 million, an increase in accounts payable of $1.4 million and an increase in accrued and other current liabilities of $1.7 million. The increase in prepaid expenses and other current assets resulted from the prepayment for D&O insurance after the close of the Merger, timing of payments to our CROs and CMOs and an increase in federal tax receivable. Increases in accounts payable and accrued and other liabilities resulted from the timing of payments to our service providers.

Net cash used in operating activities was $20.6 million for the nine months ended September 30, 2019. Cash used in operating activities was primarily due to the use of funds in our operations to develop our product candidates resulting in a net loss of $21.6 million, adjusted for a change in fair value of redeemable convertible preferred stock tranche liability and TRDF liability of $2.0 million, an increase in accrued and other current liabilities of $0.6 million, partially offset by an increase in contract liabilities of $1.0 million, a decrease in prepaid expenses and other current assets of $0.8 million, an increase in accounts payable of $0.2 million, depreciation expense of $1.0 million and stock-based compensation expense of $0.9 million. The decrease in prepaid expenses and other current assets and decrease in accounts payable and an increase in accrued and other current liabilities resulted from the timing of payments to our service providers.

Cash Flows Used in Investing Activities

Net cash provided by investing activities was $102.8 million for the nine months ended September 30, 2020, which consisted of cash and restricted cash acquired in connection with the Merger of $64.1 million, proceeds from maturities of marketable debt securities of $45.0 million, partially offset by purchases of marketable debt securities of $5.7 million and purchases of property and equipment of $0.6 million.

Net cash used by investing activities was $42.9 million for the nine months ended September 30, 2019, which consisted of purchases of marketable debt securities of $60.1 million from the proceeds from the issuance of Series B redeemable convertible preferred stock and purchases of property and equipment of $0.6 million partially offset by proceeds from maturities of marketable debt securities of $17.8 million.

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Cash Flows from Financing Activities

Net cash provided by financing activities was less than $0.1 million for the nine months ended September 30, 2020, due to cash proceeds of $0.2 million from exercise of stock options partly offset by payment of debt issuance costs of $0.2 million.

Net cash provided by financing activities was $77.1 million for the nine months ended September 30, 2019, primarily due to cash proceeds from the issuance of Series B redeemable convertible preferred stock during the third quarter of 2019.

Contractual Obligations and Other Commitments

Tabular disclosure of contractual obligations is not applicable as we are electing scaled disclosure requirements available to Smaller Reporting Companies with respect to this Item 303(a)(5) under Item 303(d).

Critical Accounting Policies, Significant Judgments and Use of Estimates

Our discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements prepared in accordance with generally accepted accounting principles in the U.S.(“GAAP”). The preparation of these financial statements requires us to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses during the reported periods and related disclosures. These estimates and assumptions, including those related to revenue recognition, research and development expenses, equity-based compensation, and determination of the fair value of common shares prior to our IPO are monitored and analyzed by us for changes in facts and circumstances, and material changes in these estimates could occur in the future. These critical estimates and assumptions are based on our historical experience, our observance of trends in the industry, and various other factors that are believed to be reasonable under the circumstances and form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from our estimates under different assumptions or conditions.

During the nine months ended September 30, 2020, there were no material changes to our critical accounting policies. Our critical accounting policies are described under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations— Critical Accounting Policies and Significant Judgments and Estimates” in our final prospectus filed with the SEC on September 18, 2020  and Note 2 to our unaudited condensed consolidated financial statements included in “Part I, Item 1 — Financial Statements” of this Quarterly Report.

Off-Balance Sheet Arrangements

Since our inception, we have not engaged in any off-balance sheet arrangements.

JOBS Act Accounting Election

In addition to being a smaller reporting company, the Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. As an emerging growth company, the Company may take advantage of specified reduced disclosure and other requirements that are otherwise applicable generally to public companies. The Company would cease to be an emerging growth company on the date that is the earliest of: (i) the last day of the fiscal year in which it has total annual gross revenues of $1.07 billion or more; (ii) December 31, 2023; (iii) the date on which it has issued more than $1.0 billion in nonconvertible debt during the previous three years; or (iv) the date on which it is deemed to be a large accelerated filer under the rules of the SEC.

Indemnification Agreements

We enter into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, we indemnify, hold harmless and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, including in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third-party with respect to our technology. The term of these indemnification agreements is generally perpetual any time after the execution of the agreement. The maximum potential amount of future payments we could be required to make under these arrangements is not determinable. We have never incurred costs to defend lawsuits or settle claims related to these indemnification agreements. As a result, we believe the fair value of these agreements is minimal.

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We have also agreed to indemnify our directors and officers for certain events or occurrences while the director or officer is, or was serving, at the company’s request in such capacity. The indemnification period covers all pertinent events and occurrences during the director’s or officer’s service. The maximum potential amount of future payments we could be required to make under these indemnification agreements is not specified in the agreements; however, we have director and officer insurance coverage that reduces our exposure and enables us to recover a portion of any future amounts paid. We believe the estimated fair value of these indemnification agreements in excess of applicable insurance coverage is minimal.

Recent Accounting Pronouncements

See the section titled “Summary of Significant Accounting Policies” in Note 2 to our financial statements included elsewhere in this Quarterly Report on Form 10-Q for additional information.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Sensitivity

The market risk inherent in our financial instruments and in our financial position represents the potential loss arising from adverse changes in interest rates. As of September 30, 2020, we had cash and cash equivalents and marketable debt securities of $108.1 million, consisting of interest-bearing money market funds, asset-backed securities, corporate debt securities and commercial paper, for which the fair value would be affected by changes in the general level of U.S. interest rates. However, due to the short-term maturities and the low-risk profile of our cash equivalents, an immediate 10% relative change in interest rates would not have a material effect on the fair value of our cash equivalents or on our future interest income.

We do not believe that inflation, interest rate changes or foreign currency exchange rate fluctuations have had a significant impact on our results of operations for any periods presented herein.

Item 4. Internal Control Over Financial Reporting

Definition and limitations of disclosure controls

Our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act) are controls and other procedures that are designed to ensure that information required to be disclosed in our reports filed under the Exchange Act, such as this report, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures are also designed to ensure that such information is accumulated and communicated to our management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Our management evaluates these controls and procedures on an ongoing basis.

There are inherent limitations to the effectiveness of any system of disclosure controls and procedures. These limitations include the possibility of human error, the circumvention or overriding of the controls and procedures and reasonable resource constraints. In addition, because we have designed our system of controls based on certain assumptions, which we believe are reasonable, about the likelihood of future events, our system of controls may not achieve its desired purpose under all possible future conditions. Accordingly, our disclosure controls and procedures provide reasonable assurance, but not absolute assurance, of achieving their objectives.

Evaluation of disclosure controls and procedures

During the preparation of our consolidated financial statements as of and for the years ended December 31, 2019 and 2018, we identified material weaknesses in our internal control over financial reporting. A company’s internal control over financial reporting is a process designed by, or under the supervision of, a company’s principal executive and principal financial officers, or persons performing similar functions, and effected by a company’s Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with generally accepted accounting principles. Under standards established by the Public Company Accounting Oversight Board, a material weakness is a deficiency or combination of deficiencies in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected and corrected on a timely basis.

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In connection with the audit of our financial statements as of and for the years ended December 31, 2019 and 2018, we identified material weaknesses in our internal control over financial reporting. The material weaknesses we identified were as follows:

(i) we did not design or maintain an effective control environment commensurate with our financial reporting requirements due to lack of a sufficient number of accounting professionals with the appropriate level of experience and training;

(ii) we did not design and maintain formal accounting policies, procedures and controls to achieve complete, accurate and timely financial accounting, reporting and disclosures, and monitoring controls maintained at the corporate level were not at a sufficient level of precision to provide for the appropriate level of oversight of activities related to our internal control over financial reporting;

(iii) we did not design and maintain effective controls over segregation of duties with respect to the preparation and review of account reconciliations as well as creating and posting manual journal entries; and

(iv) we did not design and maintain formal accounting policies, processes and controls to analyze, account for and disclose complex transactions.

Remediation of Material Weaknesses in Internal Control over Financial Reporting

Our management, under the supervision of our Chief Executive Officer and Chief Financial Officer, has undertaken a plan to remediate the material weaknesses identified above. The remediation efforts summarized below, which are either implemented or in the process of being implemented, are intended to address the identified material weaknesses.

• We have engaged a temporary Corporate Controller, and are actively seeking to engage a permanent Corporate Controller, whose primary responsibilities include working with third-party consultants to improve the design, implementation, execution and supervision of the company’s internal control over financial reporting, including development of formal accounting policies, procedures and controls;

• Ensure key accounting personnel have appropriate training;

• Implement formalized training of accounting personnel responsible for preparation and review of account reconciliations and the posting and reviewing manual journal entries, to be held on a periodic basis, and ensure appropriate segregation of duties are implemented; and

• Following the merger, engage additional accounting staff with appropriate experience, certification, education and training with respect to public company accounting.

Changes in Internal Control over Financial Reporting

On September 15, 2020, we completed a reverse merger with resTORbio, Inc. and our management is in the process of evaluating any related changes to our internal control over financial reporting as a result of this integration. Except for any changes relating to this integration, there has been no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, we may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters which arise in the ordinary course of business. While the outcome of any such proceedings cannot be predicted with certainty, as of September 30, 2020, we were not party to any legal proceedings that we would expect to have a material adverse impact on our financial position, results of operations or cash flow.

Item 1A. Risk Factors.

Investing in our common stock involves a high degree of risk. Careful consideration should be given to the following risk factors, in addition to the other information set forth in this Quarterly Report on Form 10-Q, our Annual Report for the year ended December 31, 2019 and in other documents that we file with the SEC, in evaluating us and our business. If any of the following risks and uncertainties actually occurs, our business, prospects, financial condition and results of operations could be materially and adversely affected. The risks described below are not intended to be exhaustive and are not the only risks facing us. New risk factors can emerge from time to time, and it is not possible to predict the impact that any factor or combination of factors may have on our business, prospects, financial condition and results of operations.

Risks Related to Our Business and Industry

Risks Related to Operating History

We have a limited operating history and face significant challenges and expense as we build our capabilities.

Biopharmaceutical product development is a highly speculative undertaking and involves a substantial degree of risk. We began operation in November 2014. We have a limited operating history upon which you can evaluate our business and prospects and is subject to the risks inherent in any early stage company, including, among other things, risks that we may not be able to hire sufficient qualified personnel and establish operating controls and procedures. We currently do not have complete in-house resources to enable our gamma delta T cell platform. As we build our own capabilities, we expect to encounter risks and uncertainties frequently experienced by growing companies in new and rapidly evolving fields, including the risks and uncertainties described herein. Consequently, any predictions made about our future success or viability may not be as accurate as they could be if we had a history of successfully developing and commercializing biopharmaceutical products.

We have incurred net losses in every period since our inception and anticipates that we will incur substantial net losses in the future.

We are a pre-clinical stage biopharmaceutical company. Investment in biopharmaceutical product development is highly speculative because it entails substantial upfront capital expenditures and significant risk that any potential product candidate will fail to demonstrate adequate effect or an acceptable safety profile, gain regulatory approval and become commercially viable. Our programs, including ADI-001 and ADI-002, remain in the pre-clinical stage. We have no products approved for commercial sale and have not generated any revenue from product sales to date, and we will continue to incur significant research and development and other expenses related to our ongoing operations. As a result, we are not profitable and have incurred net losses in each period since our inception. For the nine months ended September 30, 2020 and 2019, we reported net losses of $27.7 million and $21.6 million, respectively. As of September 30, 2020, we had an accumulated deficit of $97.4 million.

We expect to incur significant expenditures for the foreseeable future, and we expect these expenditures to increase as we continue our research and development of, and seek regulatory approvals for, product candidates based on our gamma delta T cell platform, including ADI-001 and ADI-002. Even if we succeed in commercializing one or more of our product candidates, we will continue to incur substantial research and development and other expenditures to develop and market additional product candidates. We may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and working capital. Further, even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would depress the value of our company and could impair our ability to raise capital, expand our business,

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maintain our research and development efforts, diversify our product candidates or even continue our operations, any of which could have a material adverse effect on our business, financial condition, results of operations, and prospects and cause you to lose all or part of your investment.

Our history of recurring losses and anticipated expenditures raise substantial doubts about our ability to continue as a going concern. Our ability to continue as a going concern requires that we obtain sufficient funding to finance our operations.

We have incurred operating losses to date and it is possible we will never generate a profit. Our financial statements included elsewhere in this quarterly report on Form 10-Q have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business. These financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of these uncertainties related to our ability to operate on a going concern basis. If we are unable to raise sufficient capital when needed, our business, financial condition and results of operations will be harmed, and we will need to significantly modify our operational plans to continue as a going concern. If we are unable to continue as a going concern, we might have to liquidate our assets and the values we receive for our assets in liquidation or dissolution could be significantly lower than the values reflected in our financial statements. The potential inclusion of a going concern explanatory paragraph by our auditors, our lack of cash resources and our potential inability to continue as a going concern may negatively impact our share price and our ability to raise new capital or to enter into critical contractual relations with third parties due to concerns about our ability to meet our contractual obligations.

Risks Related to Our Product Candidates

Our business is highly dependent on the success of ADI-001 and ADI-002. If we are unable to obtain approval for ADI-001 or ADI-002 and effectively commercialize ADI-001 or ADI-002 for the treatment of patients in our approved indications, our business would be significantly harmed.

Our business and future success depends on our ability to obtain regulatory approval of, and then successfully commercialize, our most advanced product candidates, ADI-001 and ADI-002. ADI-001 is in the early stages of development and we intend to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients in the first quarter of 2021. ADI-002 is also in the early stage of development and we intend to file an IND in late 2021.

Our pre-clinical results to date may not predict results for our planned trials or any future studies of ADI-001 and ADI-002 or any other allogeneic gamma delta T cell product candidate. Because of the lack of evaluation of allogeneic products and gamma delta T cell therapy products in the clinic to date, any such product’s failure, or the failure of other allogeneic T cell therapies or gamma delta T cell therapies, may significantly influence physicians’ and regulators’ opinions in regards to the viability of our entire pipeline of allogeneic T cell therapies, which could have a material adverse effect on our reputation. If our gamma delta T cell therapy is viewed as less safe or effective than autologous therapies or other allogeneic T cell therapies, our ability to develop other allogeneic gamma delta T cell therapies may be significantly harmed.

All of our product candidates, including ADI-001 and ADI-002, will require additional clinical and non-clinical development, regulatory review and approval in multiple jurisdictions, substantial investment, access to sufficient commercial manufacturing capacity and significant marketing efforts before we can generate any revenue from product sales. In addition, because ADI-001 is our most advanced product candidate, and because our other product candidates are based on similar technology, if ADI-001 encounters safety or efficacy problems, manufacturing problems, developmental delays, regulatory issues or other problems, our development plans and business would be significantly harmed, which could have a material adverse effect on our business, reputation and prospects.

Our gamma delta T cell candidates represent a novel approach to cancer treatment that creates significant challenges for us.

We are developing a pipeline of gamma delta T cell product candidates and a novel antibody platform that are intended for use in patient with certain cancers. Advancing these novel product candidates creates significant challenges for us, including:

• manufacturing our product candidates to our specifications and in a timely manner to support our future clinical trials, and, if approved, commercialization;

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• sourcing future clinical and, if approved, commercial supplies for the raw materials used to manufacture our product candidates;

• understanding and addressing variability in the quality of a donor’s T cells, which could ultimately affect our ability to produce product in a reliable and consistent manner;

• inability to achieve efficacy in cancer patients following treatment with our product candidates;

• achieving a side effect profile, including GvHD, from our product candidates that makes them commercially unattractive for further development;

• educating medical personnel regarding the potential side effect profile of our product candidates, if approved;

• using medicines to manage adverse side effects of our product candidates which may not adequately control the side effects and/or may have a detrimental impact on the efficacy of the treatment;

• conditioning patients with chemotherapy or other lymphodepletion agents in advance of administering our product candidates, which may increase the risk of adverse side effects;

• obtaining regulatory approval, as the FDA and other regulatory authorities have limited experience with development of allogeneic T cell therapies for cancer; and

• establishing sales and marketing capabilities upon obtaining any regulatory approval to gain market acceptance of a novel therapy.

The success of our business, including our ability to obtain financing and generate any revenue in the future, will primarily depend on the successful development, manufacturing, positive efficacy and safety profile in our clinical trials, regulatory approval and commercialization of our novel product candidates, which may never occur. We have not yet succeeded and may not succeed in demonstrating efficacy and safety for any of our product candidates in clinical trials or in obtaining marketing approval thereafter. Given our early stage of development, it may be several years, if at all, before we have demonstrated the safety and efficacy of a product candidate sufficient to warrant approval for commercialization. If we are unable to develop, or obtain regulatory approval for, or, if approved, successfully commercialize our product candidates, we may not be able to generate sufficient revenue to continue our business, which could have a material adverse effect on our results of operations and prospects.

Our product candidates are based on novel technologies, which makes it difficult to predict the likely success of such product candidates and the time and cost of product candidate development and obtaining regulatory approval.

We have concentrated our research and development efforts on our allogeneic gamma delta T cell therapy and our future success depends on the successful development of this therapeutic approach. We are in the early stages of developing our platform and product candidates and there can be no assurance that any development problems we have experienced or may experience in the future will not cause significant delays or result in unforeseen issues or unanticipated costs, or that any such development problems or issues can be overcome. We may also experience delays in developing a sustainable, reproducible and scalable manufacturing process or transferring that process to commercial partners, which may prevent us from completing our future clinical studies or commercializing our products on a timely or profitable basis, if at all. In addition, our expectations with regard to the advantages of an allogenic gamma delta T cell therapy platform relative to other therapies may not materialize or materialize to the degree we anticipate. Further, our scalability and costs of manufacturing may vary significantly as we develop our product candidates and understands these critical factors.

In addition, the clinical study requirements of the FDA, EMA and other regulatory agencies and the criteria these regulators use to determine the safety and efficacy of a product candidate are determined according to the type, complexity, novelty and intended use and market of the potential products. The regulatory approval process for novel product candidates such as ours can be more complex and consequently more expensive and take longer than for other, better known or extensively studied pharmaceutical or other product candidates. Approvals by the EMA and FDA for existing autologous CAR-T therapies, such as Kymriah® and Yescarta®, may not be indicative of what these regulators may require for approval of our therapies. Also, while we expect reduced variability in our products candidates compared to autologous products, we do not have significant clinical data supporting any benefit of lower variability. More generally, approvals by any regulatory agency may not be indicative of what any other regulatory agency may require for approval or what such regulatory agencies may require for approval in connection with new product candidates.

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Our product candidates may also not perform successfully in clinical trials or may be associated with adverse events that distinguish them from the autologous CAR-T therapies that have previously been approved or alpha beta T cell therapies that may be approved in the future. Unexpected clinical outcomes could materially and adversely affect our business, results of operations and prospects.

Our product candidates may cause undesirable side effects or have other properties that could halt our clinical development, prevent our regulatory approval, limit our commercial potential or result in significant negative consequences.

Undesirable or unacceptable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA or other comparable foreign regulatory authorities. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. Approved autologous CAR-T therapies and those under development have shown frequent rates of cytokine release syndrome and neurotoxicity, and adverse events have resulted in the death of patients. While we believe our gamma delta T cell therapy may lessen such results, similar or other adverse events for our allogeneic gamma delta T cell product candidates may occur. In addition, while we anticipate our focus on gamma delta T cells may lessen the likelihood of GvHD relative to therapies relying on unrelated alpha beta T cells, similar or other adverse events for our allogeneic gamma delta T cell product candidates may occur.

If unacceptable toxicities arise in the development of our product candidates, we could suspend or terminate our trials or the FDA or comparable foreign regulatory authorities could order us to cease clinical trials or deny approval of our product candidates for any or all targeted indications. The data safety monitoring board may also suspend or terminate a clinical trial at any time on various grounds, including a finding that the research patients are being exposed to an unacceptable health risk, including risks inferred from other unrelated immunotherapy trials. Treatment-related side effects could also affect patient recruitment or the ability of enrolled subjects to complete the trial or result in potential product liability claims. Novel therapeutic candidates, such as those developed by us, may result in novel side effect profiles that may not be appropriately recognized or managed by the treating medical staff. We anticipate having to train medical personnel using our product candidates to understand the side effect profile of our product candidates for our clinical trials and upon any commercialization of any of our product candidates. Inadequate training in recognizing or managing the potential side effects of our product candidates could result in serious adverse events including patient deaths. Based on available preclinical data and on management’s clinical experience with other cell therapy agents, the safety profile of our pipeline product candidates is expected to include cytokine release syndrome, neurotoxicity, and possibly additional adverse events. Any of these occurrences may have a material adverse effect our business, financial condition and prospects.

Risks Related to Clinical Trials

Our clinical trials may fail to demonstrate the safety and efficacy of any of our product candidates, which would prevent or delay regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of our product candidates, including ADI-001 and ADI-002, we must demonstrate through lengthy, complex and expensive preclinical testing and clinical trials that our product candidates are both safe and effective for use in each target indication. Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials.

There is typically an extremely high rate of attrition from the failure of product candidates proceeding through clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy profile despite having progressed through preclinical studies and initial clinical trials. A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy, insufficient durability of efficacy or unacceptable safety issues, notwithstanding promising results in earlier trials. Most product candidates that commence clinical trials are never approved as products.

In addition, for ADI-001 and ADI-002 and any future trials that may be completed, we cannot guarantee that the FDA or foreign regulatory authorities will interpret the results as we do, and more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not satisfactory to the FDA or foreign regulatory authorities for support of a marketing application, approval of our product candidates may be significantly delayed, or we may be required to expend significant additional resources, which may not be available to us, to conduct additional trials in support of potential approval of our product candidates. Any of the foregoing could have a material adverse effect on our business, prospects and financial condition.

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Interim “top line” and preliminary data from our clinical trials that we may announce or publish from time to time may change as more patient data becomes available and are subject to audit and verification procedures that could result in material changes in the final data.

From time to time, we may publish interim “top line” or preliminary data from our clinical studies. Interim data from clinical trials that we may complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data become available.

Preliminary or “top line” data also remain subject to audit and verification procedures that may result in the final data being materially different from the preliminary data we previously published. As a result, interim and preliminary data should be viewed with caution until the final data are available. Adverse differences between preliminary or interim data and final data could significantly harm our business prospects.

We may not be able to file INDs to commence additional clinical trials on the timelines we expect, and even if we are able to, the FDA may not permit us to proceed.

In October 2020, the IND for our lead product candidate, ADI-001, to treat patients with NHL was cleared by the FDA. Additionally, we plan to submit an IND and, subject to the FDA’s regulatory process for review of INDs, initiate Phase 1 clinical trials of ADI-002 in 2021. However, our timing of filing on ADI-002 is dependent on further pre-clinical and manufacturing success, which we work on with various third parties. We cannot be sure that we will be able to submit our IND in a timely manner, if at all, or that submission of an IND or IND amendment will result in the FDA allowing testing and clinical trials to begin, or that, once begun, issues will not arise that suspend or terminate such clinical trials. Additionally, even if such regulatory authorities agree with the design and implementation of the clinical trials set forth in an IND or clinical trial application, we cannot guarantee that such regulatory authorities will not change their requirements in the future. The inability to initiate a clinical trial on ADI-001 or ADI-002 on the timeline currently anticipated or at all could have a material adverse effect on our business, results of operations and prospects.

We may encounter substantial delays in our clinical trials, or may not be able to conduct our trials on the timelines we expect.

Clinical testing is expensive, time consuming and subject to uncertainty. We cannot guarantee that any clinical studies will be conducted as planned or completed on schedule, if at all. Even if these trials begin as planned, issues may arise that could suspend or terminate such clinical trials. A failure of one or more clinical studies can occur at any stage of testing, and our future clinical studies may not be successful. Events that may prevent successful or timely completion of clinical development include:

• inability to generate sufficient preclinical, toxicology or other in vivo or in vitro data to support the initiation of clinical studies;

• delays in sufficiently developing, characterizing or controlling a manufacturing process suitable for advanced clinical trials;

• delays in developing suitable assays for screening patients for eligibility for trials with respect to certain product candidates;

• delays in reaching a consensus with regulatory agencies on study design;

• delays in reaching agreement on acceptable terms with prospective CROs and clinical study sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and clinical study sites;

• delays in obtaining required institutional review board (IRB) approval at each clinical study site;

• imposition of a temporary or permanent clinical hold by regulatory agencies for a number of reasons, including after review of an IND application or amendment, or equivalent application or amendment; as a result of a safety finding that presents unreasonable risk to clinical trial participants; a negative finding from an inspection of our clinical study operations or study sites; developments on trials conducted by competitors for related technology that raises FDA concerns about risk to patients of the technology broadly; or if FDA finds that the investigational protocol or plan is clearly deficient to meet its stated objectives;

• delays in recruiting suitable patients to participate in our clinical studies;

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• difficulty collaborating with patient groups and investigators;

• failure by our CROs, other third parties or it to adhere to clinical study requirements;

• failure to perform in accordance with the FDA’s good clinical practice (GCP) requirements or applicable regulatory guidelines in other countries;

• transfer of manufacturing processes to any new clinical manufacturing organization (“CMO”) or our own manufacturing facilities or any other development or commercialization partner for the manufacture of product candidates;

• delays in having patients complete participation in a study or return for post-treatment follow-up;

• patients dropping out of a study;

• occurrence of adverse events associated with the product candidate that are viewed to outweigh its potential benefits;

• changes in regulatory requirements and guidance that require amending or submitting new clinical protocols;

• changes in the standard of care on which a clinical development plan was based, which may require new or additional trials;

• the cost of clinical studies of our product candidates being greater than we anticipate;

• clinical studies of our product candidates producing negative or inconclusive results, which may result in us deciding, or regulators requiring us, to conduct additional clinical studies or abandon product development programs;

• delays or failure to secure supply agreements with suitable raw material suppliers, or any failures by suppliers to meet our quantity or quality requirements for necessary raw materials; and

• delays in manufacturing, testing, releasing, validating, or importing/exporting sufficient stable quantities of our product candidates for use in clinical studies or the inability to do any of the foregoing.

Our timing of filing on these product candidates is dependent on further pre-clinical and manufacturing success, which we work on with various third parties. We cannot be sure that we will be able to submit our IND in a timely manner, if at all, or that submission of an IND or IND amendment will result in the FDA allowing testing and clinical trials to begin, or that, once begun, issues will not arise that suspend or terminate such clinical trials. Additionally, even if such regulatory authorities agree with the design and implementation of the clinical trials set forth in an IND or clinical trial application, we cannot guarantee that such regulatory authorities will not change their requirements in the future.

Any inability to successfully complete preclinical and clinical development could result in additional costs to us or impair our ability to generate revenue. In addition, if we make manufacturing or formulation changes to our product candidates, we may be required to or we may elect to conduct additional studies to bridge our modified product candidates to earlier versions. Clinical study delays could also shorten any periods during which our products have patent protection and may allow our competitors to bring products to market before we do, which could impair our ability to successfully commercialize our product candidates and may harm our business and results of operations.

Monitoring safety of patients receiving our product candidates is challenging, which could adversely affect our ability to obtain regulatory approval and commercialize.

In our planned clinical trials of our product candidates, we have contracted with and expect to continue to contract with academic medical centers and hospitals experienced in the assessment and management of toxicities arising during clinical trials. Nonetheless, these centers and hospitals may have difficulty observing patients and treating toxicities, which may be more challenging due to personnel changes, inexperience, shift changes, house staff coverage or related issues. This could lead to more severe or prolonged toxicities or even patient deaths, which could result in us or the FDA delaying, suspending or terminating one or more of our clinical trials, and which could jeopardize regulatory approval. Medicines used at centers to help manage adverse side effects of ADI-001 and ADI- 002 may not adequately control the side effects and/or may have a detrimental impact on the efficacy of the treatment. Use of these medicines may increase with new physicians and centers administering our product candidates, any of which could have a material adverse effect on our ability to obtain regulatory approval and commercialize on the timelines anticipated or at all, which could have a material adverse effect on our business and results of operations.

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If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

We may experience difficulties in patient enrollment in our clinical trials for a variety of reasons, including, without limitation, the impact of the COVID-19 pandemic. The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the study until its conclusion. The enrollment of patients depends on many factors, including:

• the patient eligibility criteria defined in the protocol;

• the size of the patient population required for analysis of the trial’s primary endpoints;

• the proximity of patients to study sites;

• the design of the trial;

• Our ability to recruit clinical trial investigators with the appropriate competencies and experience;

• Our ability to obtain and maintain patient consents; and

• the risk that patients enrolled in clinical trials will drop out of the trials before the infusion of our product candidates or trial completion.

We intend to conduct a number of clinical trials for product candidates in the fields of cancer and other indications in geographies which are affected by COVID-19 pandemic. Wet believe that the coronavirus pandemic will have an impact on various aspects of our future clinical trials. For example, investigators may not want to take the risk of exposing cancer patients to COVID-19 since the dosing of patients is conducted within an in-patient setting. Other potential impacts of the COVID-19 pandemic on our future various clinical trials include patient dosing and study monitoring, which may be paused or delayed due to changes in policies at various clinical sites, federal, state, local or foreign laws, rules and regulations, including quarantines or other travel restrictions, prioritization of healthcare resources toward pandemic efforts, including diminished attention of physicians serving as our clinical trial investigators and reduced availability of site staff supporting the conduct of our clinical trials, interruption or delays in the operations of the government regulators, or other reasons related to the COVID-19 pandemic. It is unknown how long these pauses or disruptions could continue.

In addition, our clinical trials will compete with other clinical trials for product candidates that are in the same therapeutic areas as our product candidates, and this competition will reduce the number and types of patients available to us because some patients who might have opted to enroll in our trials may instead opt to enroll in a trial being conducted by one of our competitors. Since the number of qualified clinical investigators is limited, some of our clinical trial sites are also being used by some of our competitors, which may reduce the number of patients who are available for our clinical trials in that clinical trial site.

Moreover, because our product candidates represent unproven methods for cancer treatment, potential patients and their doctors may be inclined to use conventional therapies, such as chemotherapy and hematopoietic cell transplantation or autologous CAR-T cell therapies, rather than enroll patients in our clinical trial. Patients eligible for allogeneic CAR-T cell therapies but ineligible for autologous CAR T cell therapies due to aggressive cancer and inability to wait for autologous CAR-T cell therapies may be at greater risk for complications and death from therapy.

Delays in patient enrollment may result in increased costs or may affect the timing or outcome of our ongoing clinical trial and planned clinical trials, which could prevent completion of these trials and adversely affect our ability to advance the development of our product candidates.

Clinical trials are expensive, time-consuming and difficult to design and implement.

Human clinical trials are expensive and difficult to design and implement, in part because they are subject to rigorous regulatory requirements. Because our gamma delta T cell product candidates are based on new technologies and will require the creation of inventory of mass-produced, off-the-shelf products, we expect that we will require extensive research and development and have substantial manufacturing and processing costs. In addition, costs to treat patients with Non Hodgkin’s lymphoma cancer and to treat potential side effects that may result from our product candidates can be significant. Accordingly, our clinical trial costs are likely to be significantly higher than for more conventional therapeutic technologies or drug products, which is expected to have a material adverse effect on our financial position and ability to achieve profitability.

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A variety of risks associated with conducting research and clinical trials abroad and marketing our product candidates internationally could materially adversely affect our business.

We plan to globally develop our product candidates. Accordingly, we expect that it will be subject to additional risks related to operating in foreign countries, including:

• differing regulatory requirements in foreign countries;

• unexpected changes in tariffs, trade barriers, price and exchange controls and other regulatory requirements;

• increased difficulties in managing the logistics and transportation of storing and shipping product candidates produced in the United States and shipping the product candidate to the patient abroad;

• import and export requirements and restrictions;

• economic weakness, including inflation, or political instability in particular foreign economies and markets;

• compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;

• foreign taxes, including withholding of payroll taxes;

• foreign currency fluctuations, which could result in increased operating expenses and reduced revenue, and other obligations incident to doing business in another country;

• difficulties staffing and managing foreign operations;

• workforce uncertainty in countries where labor unrest is more common than in the United States;

• differing payor reimbursement regimes, governmental payors or patient self-pay systems, and price controls;

• potential liability under the Foreign Corrupt Practices Act of 1977 or comparable foreign regulations;

• challenges enforcing our contractual and intellectual property rights, especially in those foreign countries that do not respect and protect intellectual property rights to the same extent as the United States;

• production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and

• business interruptions resulting from geo-political actions, including war and terrorism.

These and other risks associated with our potential international operations may materially adversely affect our ability to attain or maintain profitable operations, which could have a material adverse effect on our business and results of operations.

Risks Related to Marketing Our Product Candidates

The market opportunities for our product candidates may be limited to those patients who are ineligible for or have failed prior treatments and may be small.

The FDA often approves new therapies initially only for use in patients who are currently not adequately treated with currently approved therapies. We expect to initially seek approval of ADI-001 and ADI-002 and our other product candidates in this setting. Subsequently, for those products that prove to be sufficiently beneficial, if any, we would expect to seek approval in earlier lines of treatment and potentially as a first line therapy. There is no guarantee that our product candidates, even if approved, would be approved for earlier lines of therapy, and, prior to any such approvals, we will have to conduct additional clinical trials, including potentially comparative trials against approved therapies. We are also targeting a similar patient population as autologous CART product candidates, including approved autologous CART products. Our therapies may not be as safe and effective as autologous CART therapies and may only be approved for patients who are ineligible for autologous CART therapy.

Our projections of both the number of people who have the cancers we are targeting, as well as the subset of people with these cancers in a position to receive second or later lines of therapy and who have the potential to benefit from treatment with our product candidates, are based on our beliefs and estimates. These estimates have been derived from a variety of sources, including scientific literature, patient foundations, or market research and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of these cancers. The number of patients may turn out

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to be lower than expected. Additionally, the potentially addressable patient population for our product candidates may be limited or may not be amenable to treatment with our product candidates. Even if we obtain significant market share for our product candidates, because the potential target populations are small, we may never achieve profitability without obtaining regulatory approval for additional indications.

If we fail to develop additional product candidates, our commercial opportunity will be limited.

One of our core strategies is to pursue clinical development of additional product candidates beyond ADI-001 and ADI-002. Developing, obtaining regulatory approval and commercializing additional gamma delta T cell product candidates will require substantial additional funding and is prone to the risks of failure inherent in medical product development. We cannot provide you any assurance that it will be able to successfully advance any of these additional product candidates through the development process.

Even if we receive FDA approval to market additional product candidates for the treatment of cancer, we cannot assure you that any such product candidates will be successfully commercialized, widely accepted in the marketplace or more effective than other commercially available alternatives. If we are unable to successfully develop and commercialize additional product candidates, our commercial opportunity will be limited. Moreover, a failure in obtaining regulatory approval of additional product candidates may have a negative effect on the approval process of any other, or result in losing approval of any approved, product candidate which could have a material adverse effect on our business and prospects.

We currently have no marketing and sales organization and as a company have no experience in marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, we may not be able to generate product revenue.

We currently have no sales, marketing or distribution capabilities and as a company have no experience in marketing products. We may develop a marketing organization and sales force, which will require significant capital expenditures, management resources and time. We will have to compete with other pharmaceutical and biotechnology companies to recruit, hire, train and retain marketing and sales personnel.

If we are unable or decides not to establish internal sales, marketing and distribution capabilities, we will pursue collaborative arrangements regarding the sales and marketing of our products; however, there can be no assurance that we will be able to establish or maintain such collaborative arrangements, or if we are able to do so, that it will have effective sales forces. Any revenue we receive will depend upon the efforts of such third parties, which may not be successful. We may have little or no control over the marketing and sales efforts of such third parties and our revenue from product sales may be lower than if we had commercialized our product candidates ourselves. We also face competition in our search for third parties to assist it with the sales and marketing efforts of our product candidates.

There can be no assurance that we will be able to develop in-house sales and distribution capabilities or establish or maintain relationships with third-party collaborators to commercialize any product that receives regulatory approval in the United States or overseas. If we are unable to successfully market and distribute our products, our business, results of operations and prospects could be materially adversely effected.

We face significant competition from other biotechnology and pharmaceutical companies, and our operating results will suffer if we fail to compete effectively.

The biopharmaceutical industry, and the immuno-oncology industry specifically, is characterized by intense competition and rapid innovation. Our competitors may be able to develop other compounds or drugs that are able to achieve similar or better results. Our potential competitors include major multinational pharmaceutical companies, established biotechnology companies, specialty pharmaceutical companies and universities and other research institutions. Many of our competitors have substantially greater financial, technical and other resources, such as larger research and development staff and experienced marketing and manufacturing organizations and well-established sales forces. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large, established companies. Mergers and acquisitions in the biotechnology and pharmaceutical industries may result in even more resources being concentrated in our competitors. Competition may increase further as a result of advances in the commercial applicability of technologies and greater availability of capital for investment in these industries. Our competitors, either alone or with collaborative partners, may succeed in developing, acquiring or licensing on an exclusive basis drug or biologic products that are more effective, safer, more easily commercialized or less costly than our product candidates or may develop proprietary technologies or secure patent protection that we may need for the development of our technologies and products.

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Specifically, engineered T cells face significant competition in both the CAR and TCR technology space from multiple companies. Even if we obtain regulatory approval of our product candidates, the availability and price of our competitors’ products could limit the demand and the price we are able to charge for our product candidates. We may not be able to implement our business plan if the acceptance of our product candidates is affected by price competition or the reluctance of physicians to switch from existing methods of treatment to our product candidates, or if physicians switch to other new drug or biologic products or choose to reserve our product candidates for use in limited circumstances.

Risks Related to Manufacturing

We do not currently operate our own manufacturing facility, which would require significant resources and any failure to successful manufacture our products could adversely affect our clinical trials and the commercial viability of our product candidates.

We may not be able to achieve clinical or commercial manufacturing and cell processing on our own or through our CMOs, including mass-producing off-the-shelf product to satisfy demands for any of our product candidates. Very few companies have experience in manufacturing gamma delta T cell therapy derived from blood of healthy donors and gamma delta T cells require several complex manufacturing steps before being available as a mass-produced, off-the-shelf product. While we believe our manufacturing and processing approaches are appropriate to support our clinical product development, we have limited experience in managing the allogeneic gamma delta T cell engineering process, and our allogeneic processes may be more difficult or more expensive than the approaches taken by our competitors. We cannot be sure that the manufacturing processes employed by or on our behalf will result in T cells that will be safe and effective.

Our operations remain subject to review and oversight by the FDA and the FDA could object to our use of any manufacturing facilities. We must first receive approval from the FDA prior to licensure to manufacture our product candidates, which we may never obtain. Even if approved, we would be subject to ongoing periodic unannounced inspection by the FDA and corresponding state agencies to ensure strict compliance with current good manufacturing practices (cGMPs) and other government regulations. Our license to manufacture product candidates will be subject to continued regulatory review.

Our cost of goods development is at an early stage. The actual cost to manufacture and process our product candidates could be greater than we expect and could materially and adversely affect the commercial viability of our product candidates.

The manufacture of biopharmaceutical products is complex and requires significant expertise, including the development of advanced manufacturing techniques and process controls. Manufacturers of cell therapy products often encounter difficulties in production, particularly in scaling out and validating initial production and ensuring the absence of contamination. These problems include difficulties with production costs and yields, quality control, including stability of the product, quality assurance testing, operator error, shortages of qualified personnel, as well as compliance with strictly enforced federal, state and foreign regulations. Furthermore, if contaminants are discovered in our supply of product candidates or in the manufacturing facilities, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination. We cannot assure you that any stability or other issues relating to the manufacture of our product candidates will not occur in the future.

We may fail to manage the logistics of storing and shipping our product candidates. Storage failures and shipment delays and problems caused by us, our vendors or other factors not in our control, such as weather, could result in loss of usable product or prevent or delay the delivery of product candidates to patients.

We may also experience manufacturing difficulties due to resource constraints or as a result of labor disputes. If we were to encounter any of these difficulties, our ability to provide our product candidates to patients would be jeopardized, which could have a material adverse effect on our business, results of operations and prospects.

Risks Related to Our Operations

We are highly dependent on our key personnel, and if we are not successful in attracting and retaining highly qualified personnel, we may not be able to successfully implement our business strategy.

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract and retain highly qualified managerial, scientific and medical personnel. We are highly dependent on our management, scientific and medical personnel. The loss of the services of any of our executive officers, other key employees, and other scientific and medical advisors, and our inability to find suitable replacements could result in delays in product development and harm our business.

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We conduct substantially all of our operations at our facilities in the San Francisco Bay Area. This region is headquarters to many other biopharmaceutical companies and many academic and research institutions. Competition for skilled personnel in this market is intense and may limit our ability to hire and retain highly qualified personnel on acceptable terms or at all.

To induce valuable employees to remain at the company, in addition to salary and cash incentives, we have provided stock options that vest over time. The value to employees of stock options that vest over time may be significantly affected by fluctuations in our stock price that are beyond our control and may at any time be insufficient to counteract more lucrative offers from other companies. Despite our efforts to retain valuable employees, members of our management, scientific and development teams may terminate their employment with us on short notice. Although we have employment agreements with our key employees, these employment agreements provide for at-will employment, which means that any of our employees could leave our employment at any time, with or without notice. We do not maintain “key person” insurance policies on the lives of these individuals or the lives of any of our other employees. Our success also depends on our ability to continue to attract, retain and motivate highly skilled junior, mid-level and senior managers as well as junior, mid-level and senior scientific and medical personnel.

We have grown rapidly and will need to continue to grow the size of our organization, and it may experience difficulties in managing this growth.

As our development and commercialization plans and strategies develop, and as we transitions into operating as a public company, we have rapidly expanded our employee base and expect to continue to add managerial, operational, sales, research and development, marketing, financial and other personnel. Current and future growth imposes significant added responsibilities on members of management, including:

• identifying, recruiting, integrating, maintaining and motivating additional employees;

• managing our internal development efforts effectively, including the clinical and FDA review process for our product candidates, while complying with our contractual obligations to contractors and other third parties; and

• improving our operational, financial and management controls, reporting systems and procedures.

Our future financial performance and our ability to commercialize our product candidates will depend, in part, on our ability to effectively manage our growth, and our management may also have to divert a disproportionate amount of our attention away from day-to-day activities in order to devote a substantial amount of time to managing these growth activities.

We currently rely, and for the foreseeable future will continue to rely, in substantial part on certain independent organizations, advisors and consultants, pursuant to arrangements which expire after a certain period of time, to provide certain services, including certain research and development as well as general and administrative support. There can be no assurance that the services of independent organizations, advisors and consultants will continue to be available to us on a timely basis when needed, or that we can find qualified replacements. In addition, if we are unable to effectively manage our outsourced activities or if the quality or accuracy of the services provided by consultants is compromised for any reason, our clinical trials may be extended, delayed or terminated, and we may not be able to obtain regulatory approval of our product candidates or otherwise advance our business. There can be no assurance that we will be able to manage our existing consultants or find other competent outside contractors and consultants on economically reasonable terms, or at all.

If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, we may not be able to successfully implement the tasks necessary to further develop and commercialize our product candidates and, accordingly, may not achieve our research, development and commercialization goals, which could have a material adverse effect on our business, results of operations and prospects.

We may form or seek strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of such alliances or licensing arrangements.

We may form or seek strategic alliances, create joint ventures or collaborations or enter into additional licensing arrangements with third parties that we believe will complement or augment our development and commercialization efforts with respect to our product candidates and any future product candidates that we may develop. Any of these relationships may require us to incur non-recurring and other charges, increase our near and long-term expenditures, issue securities that dilute our existing stockholders or disrupt our management and business. In addition, we face significant competition in

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seeking appropriate strategic partners and the negotiation process is time-consuming and complex. Moreover, we may not be successful in our efforts to establish a strategic partnership or other alternative arrangements for our product candidates because they may be deemed to be at too early of a stage of development for collaborative effort and third parties may not view our product candidates as having the requisite potential to demonstrate safety and efficacy. Any delays in entering into new strategic partnership agreements related to our product candidates could delay the development and commercialization of our product candidates in certain geographies for certain indications, which would harm our business prospects, financial condition and results of operations.

If we license products or businesses, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate them with our existing operations and company culture. For instance, our Exclusive License and Collaboration Agreement with Regeneron requires significant research and development commitments that may not result in the development and commercialization of product candidates. We cannot be certain that, following a strategic transaction or license, we will achieve the results, revenue or specific net income that justifies such transaction, which could have a material adverse effect on our business and results of operations.

We will need substantial additional financing to develop our products and implement our operating plans. If we fail to obtain additional financing, we may be unable to complete the development and commercialization of our product candidates.

We expect to spend a substantial amount of capital in the clinical development of our product candidates, including the planned clinical trials for ADI-001 and ADI-002. We will need substantial additional financing to develop our products and implement our operating plans. In particular, we will require substantial additional financing to enable commercial production of our products and initiate and complete registration trials for multiple products. Further, if approved, we will require significant additional amounts in order to launch and commercialize our product candidates.

We believe that our cash, cash equivalents and marketable debt securities will be sufficient for us to continue as a going concern for at least one year from the issuance date of the accompanying consolidated financial statements. However, changing circumstances may cause us to consume capital significantly faster than we currently anticipates, and we may need to spend more money than currently expected because of circumstances beyond our control. We may require additional capital for the further development and commercialization of our product candidates, including funding our internal manufacturing capabilities and may need to raise additional funds sooner if we choose to expand more rapidly than we presently anticipate.

We cannot be certain that additional funding will be available on acceptable terms, or at all. Other than the funding agreement and our loan agreement with Pacific Western Bank, we have no committed source of additional capital and if we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or commercialization of our product candidates or other research and development initiatives. Our license agreements may also be terminated if we are unable to meet the payment obligations under the agreements. We could be required to seek collaborators for our product candidates at an earlier stage than otherwise would be desirable or on terms that are less favorable than might otherwise be available or relinquish or license on unfavorable terms our rights to our product candidates in markets where we otherwise would seek to pursue development or commercialization themselves. Additionally, we may not be able to incur indebtedness if the ongoing macroeconomic effects of the COVID-19 pandemic, including certain actions taken by U.S. or other governmental authorities, such as decreases in short-term interest rates as announced by the Federal Reserve, cause the closure of banks for an extended period of time or a sudden increase in requests for indebtedness at one time by many potential borrowers, either or both of which could overwhelm the banking industry.

Any of the above events could significantly harm our business, prospects, financial condition and results of operations and cause the price of our common stock to decline.

Risks Related to Business Disruptions

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations, and those of our CMO, CROs and other contractors and consultants, could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, typhoons, fires, extreme weather conditions, medical epidemics, such as the COVID-19 pandemic, and other natural or man-made disasters or business interruptions. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses.

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Our ability to manufacture our product candidates could be disrupted if our operations or those of our suppliers are affected by a man-made or natural disaster or other business interruption. Our corporate headquarters are located in California near major earthquake faults and fire zones. The ultimate impact on us, our significant suppliers and our general infrastructure of being located near major earthquake faults and fire zones and being consolidated in certain geographical areas is unknown, but our operations and financial condition could suffer in the event of a major earthquake, fire or other natural disaster.

A pandemic, epidemic or outbreak of an infectious disease, such as COVID-19, may materially and adversely affect our business and operations.

Our business, financial position, results of operations or cash flows may be affected by the ongoing global COVID-19 pandemic and the resulting volatility and uncertainty it has caused, and is likely to continue to cause, in the U.S. and international markets, including as a result of prolonged economic downturn or recession. On March 11, 2020, the World Health Organization declared the recent outbreak of COVID-19 a pandemic. As a result, national, state and local authorities have recommended social distancing and imposed or are considering quarantine, shelter-in-place, curfew and similar isolation measures, including government orders and other restrictions on the conduct of business operations, which has resulted in significant unemployment levels, decreased productivity, decreases in certain non-COVID-19 healthcare activities and healthcare utilization. Such measures have had, and are likely to continue to have, adverse impacts on the U.S. economy of uncertain severity and duration and may negatively impact our operations and those of third parties on which we rely, including by causing disruptions in the supply of our product candidates and the conduct of current and future clinical trials. In addition, the COVID-19 pandemic may affect the operations of the FDA and other health authorities, which could result in delays of reviews and approvals, including with respect to our product candidates. The evolving COVID-19 pandemic is also likely to directly or indirectly impact the pace of enrollment in our future clinical trials as patients may avoid or may not be able to travel to healthcare facilities and physicians’ offices unless due to a health emergency, and clinical trial sites may be less willing to enroll patients in clinical trials that may compromise a person’s immune system. Such facilities and offices may also be required to focus limited resources on non-clinical trial matters, including treatment of COVID-19 patients, and may not be available, in whole or in part, for clinical trial services related to ADI-001 or ADI-002 or our other product candidates. Additionally, while the potential economic impact brought by, and the duration of the COVID-19 pandemic is difficult to assess or predict, the impact of the COVID-19 pandemic on the global financial markets may reduce our ability to access capital, which could negatively impact our short-term and long-term liquidity. The ultimate impact of the COVID-19 pandemic is highly uncertain and subject to change. Due to the uncertain and rapidly evolving nature of current conditions in the United States and around the world, We cannot reasonably estimate the length or severity of the COVID-19 pandemic or the related response, including the length of time it may take for normal economic and operating conditions to resume. We do not yet know the full extent of potential delays or impacts on our business, financing or clinical trial activities or on healthcare systems or the global economy as a whole. However, any of the foregoing risks, or other unforeseen risks related to the COVID-19 pandemic, could have a material impact on our liquidity, capital resources, operations and business and those of the third parties on which it relies.

Inadequate funding for the FDA and other government agencies, or disruptions in their staffing levels related to the COVID-19 global pandemic, could hinder their ability to hire and retain key leadership and other personnel, prevent new products and services from being developed or commercialized in a timely manner or otherwise prevent those agencies from performing normal business functions on which the approval of our product candidates rely, which would negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, adequate staffing, furloughs, ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of other government agencies on which our operations may rely, including those that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary government agencies, which would adversely affect our business. For example, over the last several years, including beginning on December 22, 2018, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical FDA and other government employees and stop critical activities. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business, including our ability to access the public markets and obtain necessary capital in order to properly capitalize and continue our operations.

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Risks Related to Government Regulation

Our relationships with customers, physicians including clinical investigators, clinical research organizations and third-party payors are subject, directly or indirectly, to federal and state healthcare fraud and abuse laws, false claims laws, health information privacy and security laws, transparency laws, government price reporting and other healthcare laws and regulations. If we or our employees, independent contractors, consultants, commercial partners, vendors, or other agents violate these laws, we could face substantial penalties.

These laws may impact, among other things, our clinical research program, as well as our proposed and future sales, marketing and education programs. In particular, the promotion, sales and marketing of healthcare items and services is subject to extensive laws and regulations designed to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive and other business arrangements. We may also be subject to federal, state and foreign laws governing the privacy and security of identifiable patient information. The U.S. healthcare laws and regulations that may affect our ability to operate include, but are not limited to:

• the federal Anti-Kickback Statute, which prohibits, among other things, any person or entity from knowingly and willfully, offering, paying, soliciting or receiving any remuneration, directly or indirectly, overtly or covertly, in cash or in kind, to induce, or in return for, the purchasing, leasing, ordering or arranging for the purchase, lease, or order of any item or service reimbursable under Medicare, Medicaid or other federal healthcare programs. The term “remuneration” has been broadly interpreted to include anything of value. Although there are a number of statutory exceptions and regulatory safe harbors protecting some common activities from prosecution, the exceptions and safe harbors are drawn narrowly. Practices that may be alleged to be intended to induce prescribing, purchases or recommendations, include any payments of more than fair market value, and may be subject to scrutiny if they do not qualify for an exception or safe harbor. In addition, a person or entity does not need to have actual knowledge of this statute or specific intent to violate it in order to have committed a violation. In addition, the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act and the civil monetary penalties statute;

• federal civil and criminal false claims laws and civil monetary penalty laws, including the federal civil False Claims Act, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, claims for payment or approval from Medicare, Medicaid, or other federal government programs that are false or fraudulent or knowingly making a false statement to improperly avoid, decrease or conceal an obligation to pay money to the federal government, including federal healthcare programs;

• the federal Health Insurance Portability and Accountability Act of 1996 (HIPAA), which created new federal criminal statutes that prohibit knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program or obtain, by means of false or fraudulent pretenses, representations, or promises, any of the money or property owned by, or under the custody or control of, any healthcare benefit program, including private third-party payors and knowingly and willfully falsifying, concealing or covering up by any trick, scheme or device, a material fact or making any materially false, fictitious or fraudulent statements in connection with the delivery of, or payment for, healthcare benefits, items or services. Similar to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation;

• HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act (HITECH) and their respective implementing regulations, which impose requirements on certain covered healthcare providers, health plans, and healthcare clearinghouses as well as their respective business associates that perform services for them that involve the use, or disclosure of, individually identifiable health information, relating to the privacy, security and transmission of individually identifiable health information;

• the federal Physician Payments Sunshine Act, which requires certain manufacturers of drugs, devices, biologicals and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions) to report annually to the United States Department of Health and Human Services’ Centers for Medicare & Medicaid Services (CMS) information related to payments or other transfers of value made to physicians and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members; and

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• federal consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers.

Additionally, we may be subject to analogous state and foreign healthcare laws described above, among others, some of which may be broader in scope. For example, we may be subject to the following: state antikickback and false claims laws that may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third party payors, including private insurers, or that apply regardless of payor; state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government; state laws that require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures; state and local laws requiring the registration of pharmaceutical sales and medical representatives; and state and foreign laws governing the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts. Furthermore, we are subject to General Data Protection Regulation (GDPR) and other ex-US protections, as discussed further below.

Because of the breadth of these laws and the narrowness of the statutory exceptions and regulatory safe harbors available, it is possible that some of our business activities, or our arrangements with physicians, could be subject to challenge under one or more of such laws. If we or our employees, independent contractors, consultants, commercial partners and vendors violate these laws, we may be subject to investigations, enforcement actions and/or significant penalties.

We have adopted a code of business conduct and ethics, but it is not always possible to identify and deter employee misconduct or business noncompliance, and the precautions we take to detect and prevent inappropriate conduct may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. Efforts to ensure that our business arrangements will comply with applicable healthcare laws may involve substantial costs. It is possible that governmental and enforcement authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law interpreting applicable fraud and abuse or other healthcare laws and regulations. If any such actions are instituted against us, and we are not successful in defending themselves or asserting our rights, those actions could have a significant impact on our business, including the imposition of civil, criminal and administrative penalties, damages, disgorgement, monetary fines, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings, additional reporting requirements and/or oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, and curtailment of our operations, any of which could adversely affect our ability to operate our business and our results of operations. In addition, the approval and commercialization of any of our product candidates outside the United States will also likely subject us to foreign equivalents of the healthcare laws mentioned above, among other foreign laws.

Data protection, privacy and similar laws restrict access, use, and disclosure of information, and failure to comply with or adapt to changes in these laws could materially and adversely harm our business.

We are subject to federal and state data privacy and security laws and regulations and Laws and expectations relating to privacy continue to evolve. Changes in these laws may limit our data access, use, and disclosure, and may require increased expenditures. In addition, data protection, privacy and similar laws protect more than patient information and, although they vary by jurisdiction, these laws can extend to employee information, business contact information, provider information, and other information relating to identifiable individuals. For example, the California Consumer Privacy Act requires covered businesses to, among other things, provide disclosures to California consumers regarding the collection, use and disclosure of such consumers’ personal information and afford such consumers new rights with respect to their personal information, including the right to opt out of certain sales of personal information. We believe that further increased regulation in additional jurisdictions is likely in the area of data privacy. Any of the foregoing may have a material adverse effect on our ability to provide services to patients and, in turn, our results of operations

The collection and use of personal data in the European Union (“EU”) are governed by the General Data Protection Regulation (the “GDPR”). The GDPR imposes stringent requirements for controllers and processors of personal data, including, for example, more robust disclosures to individuals and a strengthened individual data rights regime, shortened timelines for data breach notifications, limitations on retention of information, increased requirements pertaining to special categories of data, such as health data, and additional obligations when we contract with third-party processors in connection with the processing of the personal data. The GDPR also imposes strict rules on the transfer of personal data out of the European Union to the United States and other third countries. In addition, the GDPR provides that EU member states may make their own further laws and regulations limiting the processing of personal data, including genetic, biometric or health data.

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The GDPR applies extraterritorially, and we may be subject to the GDPR because of our data processing activities that involve the personal data of individuals located in the European Union, such as in connection with our EU clinical trials. Failure to comply with the requirements of the GDPR and the applicable national data protection laws of the EU member states may result in fines of up to €20,000,000 or up to 4% of the total worldwide annual turnover of the preceding financial year, whichever is higher, and other administrative penalties. GDPR regulations may impose additional responsibility and liability in relation to the personal data that our processes and we may be required to put in place additional mechanisms to ensure compliance with the new data protection rules. This may be onerous and may interrupt or delay our development activities, and adversely affect our business, financial condition, results of operations and prospects.

Data protection, privacy and similar laws protect more than patient information and, although they vary by jurisdiction, these laws can extend to employee information, business contact information, provider information, and other information relating to identifiable individuals. Failure to comply with these laws may result in, among other things, civil and criminal liability, negative publicity, damage to our reputation, and liability under contractual provisions. In addition, compliance with such laws may require increased costs to us or may dictate that wet not offer certain types of services in the future.

Risks Related to Litigation

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product candidates.

We face an inherent risk of product liability as a result of the future clinical testing of our product candidates and will face an even greater risk if we commercialize any products. For example, we may be sued if our product candidates cause or are perceived to cause injury or are found to be otherwise unsuitable during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state consumer protection acts. If we cannot successfully defend themselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of our product candidates. Even successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

• decreased demand for our product candidates;

• injury to our reputation;

• withdrawal of clinical trial participants;

• initiation of investigations by regulators;

• costs to defend the related litigation;

• a diversion of management’s time and our resources;

• substantial monetary awards to trial participants or patients;

• product recalls, withdrawals or labeling, marketing or promotional restrictions;

• loss of revenue;

• exhaustion of any available insurance and our capital resources; and

• the inability to commercialize any product candidate.

Our inability to obtain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of products we develop, alone or with corporate collaborators. Our insurance policies may also have various exclusions, and we may be subject to a product liability claim for which we have no coverage. Assuming we obtain clinical trial insurance for our clinical trials, we may have to pay amounts awarded by a court or negotiated in a settlement that exceeds our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts. Even if our agreements with any future corporate collaborators entitle it to indemnification against losses, such indemnification may not be available or adequate should any claim arise.

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Risks Related to Market Uncertainties

Unstable market and economic conditions may have serious adverse consequences on our business, financial condition and stock price.

The global credit and financial markets have experienced extreme volatility and disruptions in the past several years, including severely diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates and uncertainty about economic stability. We believe that the state of global economic conditions are particularly volatile and uncertain, not only in light of the COVID-19 pandemic and the potential global recession resulting therefrom, but also due to recent and expected shifts in political, legislative and regulatory conditions concerning, among other matters, international trade and taxation, and that an uneven recovery or a renewed global downturn may negatively impact our ability to conduct clinical trials on the scale and timelines anticipated. There can be no assurance that further deterioration in credit and financial markets and confidence in economic conditions will not occur. Our general business strategy may be adversely affected by any such economic downturn, volatile business or political environment or continued unpredictable and unstable market conditions. If the current equity and credit markets deteriorate, it may make obtaining any necessary debt or equity financing more difficult, more costly and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse effect on our growth strategy, financial performance and stock price and could require us to delay or abandon clinical development plans. In addition, there is a risk that one or more of our current service providers, manufacturers and other partners may not survive an economic downturn, which could directly affect our ability to attain our operating goals on schedule and on budget. To the extent that our profitability and strategies are negatively affected by downturns or volatility in general economic conditions, our business and results of operations may be materially adversely affected.

Legal, regulatory, political and economic uncertainty surrounding the exit of the U.K. from the European Union may be a source of instability in international markets, create significant currency fluctuations, adversely affect operations in the U.K. and pose additional risks to our business.

Following the result of a referendum in 2016, the U.K. left the EU on January 31, 2020, commonly referred to as Brexit. Pursuant to the formal withdrawal arrangements agreed between the U.K. and the EU, the U.K. will be subject to a transition period until December 31, 2020 (Transition Period), during which EU rules will continue to apply. Negotiations between the U.K. and the EU are expected to continue in relation to the customs and trading relationship between the U.K. and the EU following the expiry of the Transition Period. Such a withdrawal from the EU is unprecedented, and it is unclear how the U.K’s access to the European single market for goods, capital, services and labor within the EU, or single market, and the wider commercial, legal and regulatory environment, will impact our business.

The uncertainty concerning the U.K’s legal, regulatory, political and economic relationship with the EU after the Transition Period may be a source of instability in the international markets, create significant currency fluctuations, and/or otherwise adversely affect trading agreements or similar cross-border co-operation arrangements (whether economic, tax, fiscal, legal, regulatory or otherwise). It could also lead to a period of considerable uncertainty in relation to the regulatory process for drug development and approval in Europe, and make it more costly or difficult to advance our product candidates in the EU and U.K.

Risks Related to Our Financial Position

Our ability to use net operating losses and research and development credits to offset future taxable income may be subject to certain limitations as a result of the merger.

To the extent that we continue to generate taxable losses, unused losses will carry forward to offset future taxable income, if any, until such unused losses expire. Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change” (generally defined as a greater than 50 percentage point change (by value) in its equity ownership by certain stockholders over a rolling three-year period), such corporation’s ability to use its pre-change net operating loss carryforwards (“NOLs”) and other pre-change tax attributes (such as research tax credits) to offset its post-change income or taxes may be limited. Adicet has not conducted a study to assess whether a change of control has occurred or whether there have been multiple changes of control since inception due to the significant complexity and cost associated with such a study. As a result, if we earn net taxable income, our ability to use our pre-change NOLs to offset such taxable income may be subject to limitations, if the Company experienced an ownership change. Similar provisions of state tax law may also apply to limit our use of accumulated state tax attributes. In addition, at the state level, there may be periods during which the use of NOLs is suspended or otherwise limited, which could accelerate or permanently increase state taxes owed. As a result, even as we attained profitability, we may be unable to use a material portion of our NOLs and other tax attributes, which could adversely affect our future cash flows.

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Raising funds through lending arrangements may restrict our operations or produce other adverse results.

Our current Loan and Security Agreement with Pacific Western Bank, which we entered into on April 28, 2020 (the “Loan Agreement”) at an interest rate equal to the greater of 0.25% above the Prime Rate or 5.00%. The Loan Agreement contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets, limitations on the incurrence of additional debt and other requirements. To secure our performance of our obligations under this Loan Agreement, we granted a security interest in substantially all of our assets, other than certain intellectual property assets, to Pacific Western Bank and issued a warrant to purchase our capital stock. Our failure to comply with the covenants in the Loan Agreement, the occurrence of a material impairment in our prospect of repayment operations, business or financial condition, our ability to repay the loan, or in the value, perfection or priority of Pacific Western Bank’s lien on our assets, as determined by Pacific Western Bank, or the occurrence of certain other specified events could result in an event of default that, if not cured or waived, could result in the acceleration of all or a substantial portion of our debt, potential foreclosure on our assets and other adverse results. Additionally, we are bound by certain negative covenants setting forth actions that are not permitted to be taken during the term of the Loan Agreement without consent of Pacific Western Bank, including, without limitation, incurring certain additional indebtedness, making certain asset dispositions, entering into certain mergers, acquisitions or other business combination transactions or incurring any non-permitted lien or other encumbrance on our assets. The foregoing prohibitions and constraints on our operations could result in Adicet’s inability to: (a) acquire promising intellectual property or other assets on desired timelines or terms; (b) reduce costs by disposing of assets or business segments no longer deemed advantageous to retain; (c) stimulate further corporate growth or development through the assumption of additional debt; or (d) enter into other arrangements that necessitate the imposition of a lien on corporate assets. Moreover, if the conditions set forth in the consent provided by Pacific Western Bank are not satisfied, Adicet would effectively need to terminate the Loan Agreement and repay any outstanding loan funds or refinance the facility with another lender. As of the date of this proxy statement/prospectus/information statement, no amounts have been drawn under the Loan Agreement.

We have identified material weaknesses in our internal control over financial reporting. Failure to achieve and maintain effective internal control over financial reporting could harm our business and negatively impact the value of our common stock.

We have identified material weaknesses in our internal control over financial reporting. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. In connection with the audit of our financial statements as of and for the years ended December 31, 2019 and 2018, we identified material weaknesses in our internal control over financial reporting. The material weaknesses we identified were as follows: (i) we did not design or maintain an effective control environment commensurate with our financial reporting requirements due to lack of a sufficient number of accounting professionals with the appropriate level of experience and training; (ii) we did not design and maintain formal accounting policies, procedures and controls to achieve complete, accurate and timely financial accounting, reporting and disclosures, and monitoring controls maintained at the corporate level were not at a sufficient level of precision to provide for the appropriate level of oversight of activities related to our internal control over financial reporting; (iii) we did not design and maintain effective controls over segregation of duties with respect to the preparation and review of account reconciliations as well as creating and posting manual journal entries; and (iv) we did not design and maintain formal accounting policies, processes and controls to analyze, account for and disclose complex transactions.

Additionally, each of the control deficiencies could result in a misstatement of our accounts or disclosures that would result in a material misstatement of our annual or interim financial statements that would not be prevented or detected, and accordingly, we determined that these control deficiencies constitute material weaknesses.

Risks Related to Reliance on Third Parties

Risks Related to Third Parties

If our collaboration with Regeneron is terminated, or if Regeneron materially breaches our obligations thereunder, our business, prospects, operating results, and financial condition would be materially harmed.

Our financial performance may be significantly affected by our Regeneron collaboration that we have entered into to develop next-generation engineered immune-cell therapeutics with fully human chimeric antigen receptors (“CARs”) and T-cell receptors (“TCRs”) directed to disease-specific cell surface antigens in order to enable the precise engagement and killing of tumor cells. Under our agreement with Regeneron, Regeneron provided us with an upfront payment of $25 million and additional payments for research funding and we will collaborate with Regeneron to identify and validate targets and

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develop a pipeline of engineered immune-cell therapeutics for selected targets. Regeneron has the option to obtain development and commercial rights for a certain number of the product candidates developed by the parties, subject to an option payment for each product candidate. If Regeneron exercises our option on a given product candidate, we then have an option to participate in the development and commercialization for such product. If we do not exercise our option, we will be entitled to royalties on any future sales of such products by Regeneron. In addition to developing CARs and TCRs for use in novel immune-cell therapies as part of the collaboration, Regeneron will have the right to use these CARs and TCRs in our other antibody programs outside of the collaboration. Regeneron will also be entitled to royalties on any future sales of products developed and commercialized by us under the agreement. If Regeneron were to terminate our collaboration agreement with us, we may not have the resources or skills to replace those of our collaborator, which could require us to seek additional funding or another collaboration that might not be available on favorable terms or at all, and could cause significant delays in development and/or commercialization efforts and result in substantial additional costs to us. Termination of such collaboration agreement or the loss of rights provided to us under such agreement may create substantial new and additional risks to the successful development and commercialization of our products and could materially harm our financial condition and operating results.

Regeneron may change our strategic focus or pursue alternative technologies in a manner that results in reduced, delayed or no revenue to us under the agreement. Regeneron has a variety of marketed products and product candidates either by itself or under collaboration with other companies, including some of our competitors, and the corporate objectives of Regeneron may not be consistent with our best interests. Regeneron may change its position regarding its participation and funding of our and Regeneron joint activities, which may impact our ability to successfully pursue the program.

Our existing and future collaborations will be important to our business. If we are unable to maintain any of these collaborations, or if these collaborations are not successful, our business could be adversely affected.

We have entered, and plan to enter, into collaborations with other companies, including our collaboration agreement with Regeneron, that we believe can provide us with additional capabilities beneficial to our business. The collaboration with Regeneron provides us with important technologies, expertise and funding for our programs and technology, and we expect to receive additional technologies, expertise and funding under this and other collaborations in the future. Our existing therapeutic collaborations, and any future collaborations we enter into, may pose a number of risks, including the following:

• collaborators have significant discretion in determining the efforts and resources that they will apply;

• collaborators may not perform their obligations as expected;

• collaborators may dispute the amounts of payments owed;

• collaborators may not pursue development and commercialization of any product candidates that achieve regulatory approval or may elect not to continue or renew development or commercialization programs or license arrangements based on clinical trial results, changes in the collaborators’ strategic focus or available funding, or external factors, such as a strategic transaction that may divert resources or create competing priorities;

• collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;

• collaborators could develop independently, or with third parties, products that compete directly or indirectly with our products and product candidates if the collaborators believe that the competitive products are more likely to be successfully developed or can be commercialized under terms that are more economically attractive than ours;

• product candidates discovered in collaboration with us may be viewed by our collaborators as competitive with our own product candidates or products, which may cause collaborators to cease to devote resources to the development or commercialization of our product candidates;

• collaborators may dispute ownership or rights in jointly developed technologies or intellectual property;

• collaborators may fail to comply with applicable legal and regulatory requirements regarding the development, manufacture, sale, distribution or marketing of a product candidate or product;

• collaborators with sales, marketing, manufacturing and distribution rights to one or more of our product candidates that achieve regulatory approval may not commit sufficient resources to the sale, marketing, manufacturing and distribution of such product or products;

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• disagreements with collaborators, including disagreements over proprietary rights, contract interpretation, payment obligations or the preferred course of discovery, development, sales or marketing, might cause delays or terminations of the research, development or commercialization of product candidates, might lead to additional and burdensome responsibilities for us with respect to product candidates, or might result in litigation or arbitration, any of which would be time-consuming and expensive;

• collaborators may not properly maintain or defend their or our relevant intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential litigation and liability;

• collaborators may infringe the intellectual property rights of third parties, which may expose us to litigation and potential liability;

• if a collaborator of ours is involved in a business combination or cessation, the collaborator might deemphasize or terminate the development or commercialization of any product candidate licensed to it by us; and

• collaborations may be terminated by the collaborator, and, if terminated, we could be required to raise additional capital to pursue further development or commercialization of the applicable product candidates, or potentially lose access to the collaborator’s intellectual property.

If our therapeutic collaborations do not result in the successful discovery, development and commercialization of products or if one of our collaborators terminates our agreement with us, we may not receive any future research funding or milestone or royalty payments under the collaboration. If we do not receive the funding we expect under these agreements, our development and commercialization of our technology and product candidates could be delayed and we may need additional resources to develop product candidates and our technology. All of the risks relating to product discovery, development, regulatory approval and commercialization described in these risk factors also apply to the activities of our therapeutic collaborators.

In addition to the Regeneron collaboration described above, for some of our programs, we may in the future determine to collaborate with pharmaceutical and biotechnology companies for discovery, development and potential commercialization of therapeutic products. We face significant competition in seeking appropriate collaborators because, for example, third parties also have rights to allogeneic T-cell technologies. For example, in April 2020, Johnson & Johnson entered into a collaboration agreement with Fate Therapeutics, a company that is also using allogeneic T-cell technologies, for up to four CAR NK and CAR-T cell therapies. Our ability to reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. If we are unable to reach agreements with suitable collaborators on a timely basis, on acceptable terms, or at all, we may have to curtail discovery efforts or the development of a product candidate, reduce or delay our development program or one or more of our other development programs, delay our potential manufacture or commercialization, or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our expense. If we elect to fund and undertake discovery, development, manufacturing or commercialization activities on our own, we may need to obtain additional expertise and additional capital, which may not be available to us on acceptable terms or at all. If we fail to enter into collaborations and do not have sufficient funds or expertise to undertake the necessary discovery, development, manufacturing and commercialization activities, we may not be able to further develop our product candidates, manufacture the product candidates, bring them to market or continue to develop our technology and our business may be materially and adversely affected.

We are subject to certain exclusivity obligations under our agreement with Regeneron.

During the five year period following the effective date of the Regeneron agreement, with certain limited exceptions, we may not directly or indirectly research, develop, manufacture or commercialize a gamma delta immune cell therapeutic (“ICP”), or grant a license to do the foregoing, except pursuant to the terms of the Regeneron agreement. Both parties also have obligations not to research, develop, manufacture or commercialize an ICP with the same target as one being developed under a research program or commercialized by a party (and royalty bearing under the agreement), for so long as such activities are occurring. These exclusivity obligations are limited to engineered gamma delta immune cells to targets reasonably considered to have therapeutic relevance in oncology. If our collaboration with Regeneron is not successful, including any failure caused by the risks listed in the preceding paragraphs, and the agreement and research programs are not terminated, we may not be able to enter into collaborations with other companies with respect to ICP’s and our business could be adversely affected.

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As a result, our ability to advance any gamma delta immune cell therapeutics outside of the scope of the research plan agreed on with Regeneron is limited through July 29, 2021. We may have to forego business opportunities and will also be limited in the gamma delta immune cell therapeutics we can advance on our own. The restrictions on internal development may also prevent us from, outside of the scope of research conducted with Regeneron, improving our own technologies relating to gamma delta immune cells. These limitations could lead to delays in our ability to discover and develop gamma delta immune cell therapeutics for targets not covered by the collaboration with Regeneron and loss of opportunities to obtain additional research funding and advance our own technologies separately from the Regeneron collaboration. If we are delayed in our ability to advance our technologies, our business could be harmed.

We rely and will continue to rely on third parties to conduct our clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval of or commercialize our product candidates.

We depend and will continue to depend upon independent investigators and collaborators, such as universities, medical institutions, CROs and strategic partners to conduct our preclinical and clinical trials under agreements with us.

We negotiate budgets and contracts with CROs and study sites, which may result in delays to our development timelines and increased costs. We will rely heavily on these third parties over the course of our clinical trials, and we control only certain aspects of their activities. Nevertheless, we are responsible for ensuring that each of our studies is conducted in accordance with applicable protocol, legal, regulatory and scientific standards, and our reliance on third parties does not relieve us of our regulatory responsibilities. We and these third parties are required to comply with GCPs, which are regulations and guidelines enforced by the FDA and comparable foreign regulatory authorities for product candidates in clinical development. Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of these third parties fail to comply with applicable GCP regulations, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that, upon inspection, such regulatory authorities will determine that any of our clinical trials comply with the GCP regulations. In addition, our clinical trials must be conducted with biologic product produced under cGMPs and will require a large number of test patients. Our failure or any failure by these third parties to comply with these regulations or to recruit a sufficient number of patients may require us to repeat clinical trials, which would delay the regulatory approval process. Moreover, our business may be implicated if any of these third parties violates federal or state fraud and abuse or false claims laws and regulations or healthcare privacy and security laws.

Any third parties conducting our clinical trials are and will not be our employees and, except for remedies available to us under our agreements with such third parties, we cannot control whether or not they devote sufficient time and resources to our ongoing preclinical, clinical and nonclinical programs. These third parties may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical studies or other drug development activities, which could affect their performance on our behalf. If these third parties do not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols or regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to complete development of, obtain regulatory approval of or successfully commercialize our product candidates. As a result, our financial results and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenue could be delayed.

If any of our relationships with trial sites, or any CRO that we may use in the future, terminates, we may not be able to enter into arrangements with alternative trial sites or CROs or do so on commercially reasonable terms. Switching or adding third parties to conduct our clinical trials will involve substantial cost and require extensive management time and focus. In addition, there is a natural transition period when a new third party commences work. As a result, delays occur, which can materially impact our ability to meet our desired clinical development timelines.

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We may rely on third parties to manufacture our clinical product supplies, and we may have to rely on third parties to produce and process our product candidates, if approved.

We must currently rely on outside vendors to manufacture supplies and process our product candidates. We have not yet caused our product candidates to be manufactured or processed on a commercial scale and may not be able to achieve manufacturing and processing and may be unable to create an inventory of mass-produced, off-the-shelf product to satisfy demands for any of our product candidates.

We do not yet have sufficient information to reliably estimate the cost of the commercial manufacturing and processing of our product candidates, and the actual cost to manufacture and process our product candidates could materially and adversely affect the commercial viability of our product candidates. As a result, we may never be able to develop a commercially viable product.

In addition, we anticipate reliance on a limited number of third-party manufacturers exposes us to the following risks:

• We may be unable to identify manufacturers on acceptable terms or at all because the number of potential manufacturers is limited and the FDA may have questions regarding any replacement contractor. This may require new testing and regulatory interactions. In addition, a new manufacturer would have to be educated in, or develop substantially equivalent processes for, production of our products after receipt of FDA questions, if any.

• Our third-party manufacturers might be unable to timely formulate and manufacture our product or produce the quantity and quality required to meet our clinical and commercial needs, if any.

• Contract manufacturers may not be able to execute our manufacturing procedures appropriately.

• Our future contract manufacturers may not perform as agreed or may not remain in the contract manufacturing business for the time required to supply our clinical trials or to successfully produce, store and distribute our products.

• Manufacturers are subject to ongoing periodic unannounced inspection by the FDA, the Drug Enforcement Administration and corresponding state agencies to ensure strict compliance with cGMP and other government regulations and corresponding foreign standards. We do not have control over third-party manufacturers’ compliance with these regulations and standards.

• We may not own, or may have to share, the intellectual property rights to any improvements made by our third-party manufacturers in the manufacturing process for our products.

• Our third-party manufacturers could breach or terminate their agreement(s) with us.

Our contract manufacturers would also be subject to the same risks we face in developing our own manufacturing capabilities, as described above. Each of these risks could delay our clinical trials, the approval, if any, of our product candidates by the FDA or the commercialization of our product candidates or result in higher costs or deprive us of potential product revenue. In addition, we will rely on third parties to perform release tests on our product candidates prior to delivery to patients. If these tests are not appropriately done and test data are not reliable, patients could be put at risk of serious harm.

Cell-based therapies rely on the availability of specialty raw materials, which may not be available to us on acceptable terms or at all.

Our product candidates require many specialty raw materials, including viral vectors that deliver the targeting moiety (CAR) and other genes to the product candidate. We currently manufacture through contract manufacturers, some of which are manufactured by companies with limited resources and experience to support a commercial product, and the suppliers may not be able to deliver raw materials to our specifications. In addition, those suppliers normally support blood-based hospital businesses and generally do not have the capacity to support commercial products manufactured under cGMP by biopharmaceutical firms. The suppliers may be ill-equipped to support our needs, especially in non-routine circumstances like an FDA inspection or medical crisis, such as widespread contamination. We also do not have contracts with many of these suppliers, and we may not be able to contract with them on acceptable terms or at all. Accordingly, we may experience delays in receiving key raw materials to support clinical or commercial manufacturing.

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In addition, some raw materials utilized in the manufacture of our candidates are currently available from a single supplier, or a small number of suppliers. We cannot be sure that these suppliers will remain in business or that they will not be purchased by one of our competitors or another company that is not interested in continuing to produce these materials for our intended purpose. In addition, the lead time needed to establish a relationship with a new supplier can be lengthy, and we may experience delays in meeting demand in the event we must switch to a new supplier. The time and effort to qualify a new supplier could result in additional costs, diversion of resources or reduced manufacturing yields, any of which would negatively impact our operating results. Further, we may be unable to enter into agreements with a new supplier on commercially reasonable terms, which could have a material adverse impact on our business.

If we or our third-party suppliers use hazardous, non-hazardous, biological or other materials in a manner that causes injury or violates applicable law, we may be liable for damages.

Our research and development activities involve the controlled use of potentially hazardous substances, including chemical and biological materials. We and our suppliers are subject to federal, state and local laws and regulations in the United States governing the use, manufacture, storage, handling and disposal of medical and hazardous materials. Although we believe that our and our suppliers’ procedures for using, handling, storing and disposing of these materials comply with legally prescribed standards, we and our suppliers cannot completely eliminate the risk of contamination or injury resulting from medical or hazardous materials. As a result of any such contamination or injury, we may incur liability or local, city, state or federal authorities may curtail the use of these materials and interrupt our business operations. In the event of an accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. Compliance with applicable environmental laws and regulations is expensive, and current or future environmental regulations may impair our research, development and production efforts, which could harm our business, prospects, financial condition or results of operations.

Our internal computer systems, or those used by our CROs or other contractors or consultants, may fail or suffer security breaches.

Our internal computer systems and the systems of our CROs, contractors and consultants are vulnerable to damage from computer viruses and unauthorized access. Additionally, as a result of the ongoing COVID-19 pandemic, we have transitioned certain of our workforce to a remote working model. As our employees and our business partners’ employees work from home and access our systems remotely, we may be subject to heightened security and privacy risks, including the risks of cyberattacks and privacy incidents. While we have not experienced any such material system failure or security breach to date, if such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our development programs and our business operations. For example, the loss of clinical trial data from future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and the further development and commercialization of our product candidates could be delayed.

We may not realize the benefits of acquired assets or other strategic transactions.

We actively evaluate various strategic transactions on an ongoing basis. We may acquire other businesses, products or technologies as well as pursue joint ventures or investments in complementary businesses. The success of our strategic transactions, and any future strategic transactions depends on the risks and uncertainties involved including:

• unanticipated liabilities related to acquired companies or joint ventures;

• difficulties integrating acquired personnel, technologies and operations into our existing business;

• retention of key employees;

• diversion of management time and focus from operating our business to management of strategic alliances or joint ventures or acquisition integration challenges;

• increases in our expenses and reductions in our cash available for operations and other uses;

• disruption in our relationships with collaborators or suppliers as a result of such a transaction; and possible write-offs or impairment charges relating to acquired businesses or joint ventures.

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If any of these risks or uncertainties occur, we may not realize the anticipated benefit of any acquisition or strategic transaction. Additionally, foreign acquisitions and joint ventures are subject to additional risks, including those related to integration of operations across different cultures and languages, currency risks, potentially adverse tax consequences of overseas operations and the particular economic, political and regulatory risks associated with specific countries.

Future acquisitions or dispositions could result in potentially dilutive issuances of our equity securities, the incurrence of debt, contingent liabilities or amortization expenses or write-offs of goodwill, any of which could have a material adverse effect on our financial condition.

Risks Related to Government Regulation

Risks Related to Regulatory Approval

The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates.

The research, testing, manufacturing, labeling, approval, selling, import, export, marketing, and distribution of drug products, including biologics, are subject to extensive regulation by the FDA and other regulatory authorities in the United States. We are not permitted to market any biological drug product in the United States until we receive approval of a biologics license application (“BLA”) from the FDA. We have not previously submitted a BLA to the FDA, or similar approval filings to comparable foreign authorities. A BLA must include extensive preclinical and clinical data and sufficient supporting information to establish the product candidate’s safety and effectiveness for each desired indication. The BLA must also include significant information regarding the chemistry, manufacturing and controls for the product.

We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. For example, the FDA has limited experience with commercial development of allogeneic T cell therapies for cancer. We may also request regulatory approval of future product candidates by target, regardless of cancer type or origin, which the FDA may have difficulty accepting if our clinical trials only involved cancers of certain origins. The FDA may also require a panel of experts, referred to as an Advisory Committee, to deliberate on the adequacy of the safety and efficacy data to support licensure. The opinion of the Advisory Committee, although not binding, may have a significant impact on our ability to obtain licensure of the product candidates based on the completed clinical trials, as the FDA often adheres to the Advisory Committee’s recommendations. Accordingly, the regulatory approval pathway for our product candidates may be uncertain, complex, expensive and lengthy, and approval may not be obtained.

We may also experience delays in obtaining regulatory approvals, including but not limited to:

• obtaining regulatory authorization to begin a trial, if applicable;

• redesigning our study protocols and need to conduct additional studies as may be required by a regulator;

• governmental or regulatory delays and changes in regulation or policy relating to the development and commercialization of our product candidate by the FDA or other comparable foreign regulatory authorities;

• the outcome, timing and cost of meeting regulatory requirements established by the FDA, and other comparable foreign regulatory authorities;

• the availability of financial resources to commence and complete the planned trials;

• negotiating the terms of any collaboration agreements we may choose to initiate or conclude;

• reaching agreement on acceptable terms with prospective CROs and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

• failure of third-party contractors, such as CROs, or investigators to comply with regulatory requirements, including good clinical practice standards (GCPs);

• clinical sites deviating from trial protocol or dropping out of a trial;

• delay or failure in obtaining the necessary approvals from regulators or institutional review boards, or IRBs, in order to commence a clinical trial at a prospective trial site, or their suspension or termination of a clinical trial once commenced;

• Inability to recruit and enroll suitable patients to participate in a trial;

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• having patients complete a trial, including having patients enrolled in clinical trials dropping out of the trial before the product candidate is manufactured and returned to the site, or return for post-treatment follow-up;

• difficulty in having patients complete a trial or return for post-treatment follow-up;

• addressing any patient safety concerns that arise during the course of a trial;

• inability to add new clinical trial sites;

• varying interpretations of the data generated from our preclinical or clinical trials;

• the cost of defending intellectual property disputes, including patent infringement actions brought by third parties;

• the effect of competing technological and market developments;

• the cost and timing of establishing, expanding and scaling manufacturing capabilities;

• inability to manufacture, or obtain from third parties, sufficient quantities of qualified materials under Current Good Manufacturing Practice standards (cGMPs), for the completion in pre-clinical and clinical studies;

• problems with biopharmaceutical product candidate storage, stability and distribution resulting in global supply chain disruptions;

• the cost of establishing sales, marketing and distribution capabilities for any product candidate for which we may receive regulatory approval in regions where we choose to commercialize our products on our own; or

• potential unforeseen business disruptions or market fluctuations that delay our product development or clinical trials and increase our costs or expenses, such as business or operational disruptions, delays, or system failures due to malware, unauthorized access, terrorism, war, natural disasters, strikes, geopolitical conflicts, restrictions on trade, import or export restrictions, or public health crises, such as the current COVID-19 pandemic.

We could also encounter delays if physicians encounter unresolved ethical issues associated with enrolling patients in clinical trials of our product candidates in lieu of prescribing existing treatments that have established safety and efficacy profiles. Further, a clinical trial may be suspended or terminated by us, the IRBs for the institutions in which such trials are being conducted or by the FDA or other regulatory authorities due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, safety issues or adverse side effects, failure to demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions, lack of adequate funding to continue the clinical trial, or based on a recommendation by the Data Safety Monitoring Committee. If we experience termination of, or delays in the completion of, any clinical trial of our product candidates, the commercial prospects for our product candidates will be harmed, and our ability to generate product revenue will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product development and approval process and jeopardize our ability to commence product sales and generate revenue.

Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may ultimately lead to the denial of regulatory approval of our product candidates.

We expect the product candidates we develop will be regulated as biological products, or biologics, and therefore they may be subject to competition sooner than anticipated.

The Biologics Price Competition and Innovation Act of 2009 (“BPCIA”) was enacted as part of the Affordable Care Act to establish an abbreviated pathway for the approval of biosimilar and interchangeable biological products. The regulatory pathway establishes legal authority for the FDA to review and approve biosimilar biologics, including the possible designation of a biosimilar as “interchangeable” based on its similarity to an approved biologic. Under the BPCIA, an application for a biosimilar product cannot be approved by the FDA until 12 years after the reference product was approved under a BLA. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact, implementation, and meaning are subject to uncertainty. While it is uncertain when such processes intended to implement the BPCIA may be fully adopted by the FDA, any such processes could have a material adverse effect on the future commercial prospects for our biological products.

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We believe that any of the product candidates we develop that are approved in the United States as a biological product under a BLA should qualify for the 12-year period of exclusivity. However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, potentially creating the opportunity for generic competition sooner than anticipated. Moreover, the extent to which a biosimilar, once approved, will be substituted for any one of the reference products in a way that is similar to traditional generic substitution for non-biological products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing.

The regulatory landscape that will govern our product candidates is uncertain; regulations relating to more established cell therapy products are still developing, and changes in regulatory requirements could result in delays or discontinuation of development of our product candidates or unexpected costs in obtaining regulatory approval.

Government authorities in the United States at the federal, state and local level and in other countries regulate, among other things, the research, development, testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval monitoring and reporting, marketing and export and import of drug and biological products. Generally, before a new drug or biologic can be marketed, considerable data demonstrating its quality, safety and efficacy must be obtained, organized into a format specific for each regulatory authority, submitted for review and approved by the regulatory authority.

Because we are developing novel allogeneic cell immunotherapy product candidates, the regulatory requirements that we will be subject to are not entirely clear. Even with respect to more established products that fit into the category of cell therapies, the regulatory landscape is still developing. For example, regulatory requirements governing cell therapy products have changed frequently and may continue to change in the future. Moreover, there is substantial, and sometimes uncoordinated, overlap in those responsible for regulation of existing cell therapy products.

Complex regulatory environments exist in other jurisdictions in which we might consider seeking regulatory approvals for our product candidates, further complicating the regulatory landscape. For example, in the EU a special committee called the Committee for Advanced Therapies (“CAT”) was established within the EMA in accordance with Regulation (EC) No 1394/2007 on advanced-therapy medicinal products (“ATMPs”) to assess the quality, safety and efficacy of ATMPs, and to follow scientific developments in the field. ATMPs include somatic cell therapy products and tissue engineered products. These various regulatory review committees and advisory groups and new or revised guidelines that they promulgate from time to time may lengthen the regulatory review process, require us to perform additional studies, increase our development costs, lead to changes in regulatory positions and interpretations, delay or prevent approval and commercialization of our product candidates or lead to significant post-approval limitations or restrictions. Because the regulatory landscape for our gamma delta CAR-T cell product candidates are new, we may face even more cumbersome and complex regulations than those emerging for cell therapy products. Furthermore, even if our product candidates obtain required regulatory approvals, such approvals may later be withdrawn as a result of changes in regulations or the interpretation of regulations by applicable regulatory agencies.

Delay or failure to obtain, or unexpected costs in obtaining, the regulatory approval necessary to bring a potential product to market could decrease our ability to generate sufficient product revenue to maintain our business.

The FDA may disagree with our regulatory plan and we may fail to obtain regulatory approval of our product candidates.

The general approach for FDA approval of a new biologic or drug is for the sponsor to provide dispositive data from two well-controlled, Phase 3 clinical studies of the relevant biologic or drug in the relevant patient population. Phase 3 clinical studies typically involve hundreds of patients, have significant costs and take years to complete. We expect registrational trials for ADI-001 and ADI-002 to be designed to evaluate the efficacy of the product candidate in an open-label, non-comparative, two-stage, pivotal, multicenter, single-arm clinical trial in patients who have exhausted available treatment options. If the results are sufficiently compelling, We intend to discuss with the FDA submission of a BLA for the relevant product candidate. However, we do not have any agreement or guidance from the FDA that its regulatory development plans will be sufficient for submission of a BLA. In addition, the FDA may only allow us to evaluate patients that have failed or who are ineligible for autologous therapy, which are extremely difficult patients to treat and patients with advanced and aggressive cancer, and our product candidates may fail to improve outcomes for such patients.

Given the molecular similarities between ADI-001 and ADI-002, we may have additional difficulties progressing any clinical trial of ADI-002, if emerging data from future clinical trials of ADI-001 have safety or other issues.

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The FDA may grant accelerated approval for our product candidates and, as a condition for accelerated approval, the FDA may require a sponsor of a drug or biologic receiving accelerated approval to perform postmarketing studies to verify and describe the predicted effect on irreversible morbidity or mortality or other clinical endpoint, and the drug or biologic may be subject to withdrawal procedures by the FDA that are more accelerated than those available for regular approvals. In addition, the standard of care may change with the approval of new products in the same indications that we are studying. This may result in the FDA or other regulatory agencies requesting additional studies to show that our product candidate are superior to the new products.

Our clinical trial results may also not support approval. In addition, our product candidates could fail to receive regulatory approval for many reasons, including the following:

• the FDA or comparable foreign regulatory authorities may disagree with the design or implementation of our clinical trials;

• We may be unable to demonstrate to the satisfaction of the FDA or comparable foreign regulatory authorities that our product candidates are safe and effective for any of their proposed indications;

• the results of clinical trials may not meet the level of statistical significance required by the FDA or comparable foreign regulatory authorities for approval, including due to the heterogeneity of patient populations;

• We may be unable to demonstrate that our product candidates’ clinical and other benefits outweigh their safety risks;

• the FDA or comparable foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical trials;

• the data collected from clinical trials of our product candidates may not be sufficient to the satisfaction of the FDA or comparable foreign regulatory authorities to support the submission of a BLA or other comparable submission in foreign jurisdictions or to obtain regulatory approval in the United States or elsewhere;

• the FDA or comparable foreign regulatory authorities will inspect our commercial manufacturing facility and may not approve our facility; and

• the approval policies or regulations of the FDA or comparable foreign regulatory authorities may significantly change in a manner rendering our clinical data insufficient for approval.

We may seek orphan drug designation for some or all of our product candidates across various indications, but we may be unable to obtain such designations or to maintain the benefits associated with orphan drug designation, including market exclusivity, which may cause our revenue, if any, to be reduced.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a disease or condition with a patient population of fewer than 200,000 in the United States, or a patient population greater than 200,000 in the United States when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the United States will be recovered from sales in the United States for that drug or biologic. In order to obtain orphan drug designation, the request must be made before submitting a BLA. In the United States, orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages, and user-fee waivers. After the FDA grants orphan drug designation, the generic identity of the drug and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

If a product that has orphan drug designation subsequently receives the first FDA approval of that particular product for the disease for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications, including a BLA, to market the same biologic (meaning, a product with the same principal molecular structural features) for the same indication for seven years, except in limited circumstances such as a showing of clinical superiority to the product with orphan drug exclusivity or if FDA finds that the holder of the orphan drug exclusivity has not shown that it can assure the availability of sufficient quantities of the orphan drug to meet the needs of patients with the disease or condition for which the drug was designated. As a result, even if one of our product candidates receives orphan exclusivity, the FDA can still approve other biologics that do not have the same principal molecular structural features for use in treating the same indication or disease or the same biologic for a different indication or disease during the exclusivity period. Furthermore, the FDA can waive orphan exclusivity if we are unable to manufacture sufficient supply of our product or if a subsequent applicant demonstrates clinical superiority over our products.

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We may seek orphan drug designation for some or all of our product candidates in specific orphan indications in which there is a medically plausible basis for the use of these products. Even if we obtain orphan drug designation, exclusive marketing rights in the United States may be limited if we seek approval for an indication broader than the orphan designated indication and may be lost if the FDA later determines that the request for designation was materially defective or if we are unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition, or if a subsequent applicant demonstrates clinical superiority over our products, if approved. In addition, although we may seek orphan drug designation for other product candidates, we may never receive such designations.

Regenerative Medicine Advanced Therapy designation, even if granted for any of our product candidates, may not lead to a faster development or regulatory review or approval process and it does not increase the likelihood that our product candidates will receive marketing approval.

We may seek Regenerative Medicine Advanced Therapy (“RMAT”) designation for one or more of our product candidates. In 2017, the FDA established the RMAT designation to expedite review of a cell therapy, therapeutic tissue engineering product, human cell and tissue product, or any combination product using such therapies or products, with limited exceptions intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition and for which preliminary clinical evidence indicates that the potential to address unmet medical needs for such a disease or condition. RMAT designation provides potential benefits that include more frequent meetings with FDA to discuss the development plan for the product candidate, and eligibility for rolling review and priority review. Products granted RMAT designation may also be eligible for accelerated approval on the basis of a surrogate or intermediate endpoint reasonably likely to predict long-term clinical benefit, or reliance upon data obtained from a meaningful number of sites, including through expansion to additional sites. There is no assurance that we will be able to obtain RMAT designation for any of our product candidates. RMAT designation does not change the FDA’s standards for product approval, and there is no assurance that such designation will result in expedited review or approval or that the approved indication will not be narrower than the indication covered by the designation. Additionally, RMAT designation can be revoked if the criteria for eligibility cease to be met as clinical data emerges.

Positive results from early preclinical studies and clinical trials are not necessarily predictive of the results of any future clinical trials of our product candidate. If we cannot replicate the positive results from our earlier preclinical studies and clinical trials of our product candidate in our future clinical trials, we may be unable to successfully develop, obtain regulatory approval for and commercialize our product candidate.

Any positive results from our preclinical studies and future clinical trials of our product candidate may not necessarily be predictive of the results from required later clinical trials. Similarly, even if we are able to complete our planned preclinical studies or any future clinical trials according to our current development timeline, the positive results from such preclinical studies and clinical trials may not be replicated in subsequent preclinical studies or clinical trial results.

Many companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in late-stage clinical trials after achieving positive results in early-stage development, and we cannot be certain that we will not face similar setbacks. These setbacks have been caused by, among other things, preclinical findings made while clinical trials were underway, or safety or efficacy observations made in preclinical studies and clinical trials, including previously unreported adverse events. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses and many companies that believed their product candidate performed satisfactorily in preclinical studies and clinical trials nonetheless failed to obtain FDA or similar regulatory approval.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not mean that we will be successful in obtaining regulatory approval of our product candidates in other jurisdictions.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not guarantee that we will be able to obtain or maintain regulatory approval in any other jurisdiction, while a failure or delay in obtaining regulatory approval in one jurisdiction may have a negative effect on the regulatory approval process in others. For example, even if the FDA grants marketing approval of a product candidate, comparable regulatory authorities in foreign jurisdictions must also approve the manufacturing, marketing and promotion of the product candidate in those countries. Approval procedures vary among jurisdictions and can involve requirements and administrative review periods different from, and greater than, those in the United States, including additional preclinical studies or clinical trials as clinical studies conducted in one jurisdiction may not be accepted by regulatory authorities in other jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in that jurisdiction. In some cases, the price that we intend to charge for our products is also subject to approval.

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We may also submit marketing applications in other countries. Regulatory authorities in jurisdictions outside of the United States have requirements for approval of product candidates with which we must comply prior to marketing in those jurisdictions. Obtaining foreign regulatory approvals and compliance with foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction of our products in certain countries. If we fail to comply with the regulatory requirements in international markets and/or receive applicable marketing approvals, our target market will be reduced and our ability to realize the full market potential of our product candidates will be harmed.

Even if we receive regulatory approval of our product candidates, we will be subject to ongoing regulatory obligations and continued regulatory review, which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated problems with our product candidates.

Any regulatory approvals that we receive for our product candidates will require post-market surveillance to monitor the safety and efficacy of the product candidate. The FDA may also require a risk evaluation and mitigation strategy, or REMS, in order to approve our product candidates, which could entail requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or a comparable foreign regulatory authority approves our product candidates, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for our product candidates will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with cGMPs and cGCPs for any clinical trials that we conduct post-approval. As such, we and our contract manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any BLA, other marketing application and previous responses to inspectional observations. Accordingly, we and others with whom we work must continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production and quality control. In addition, the FDA could require us to conduct another study to obtain additional safety or biomarker information.

Further, we will be required to comply with FDA promotion and advertising rules, which include, among others, standards for direct-to-consumer advertising, restrictions on promoting products for uses or in patient populations that are not described in the product’s approved uses (known as “off-label use”), limitations on industry-sponsored scientific and educational activities and requirements for promotional activities involving the internet and social media. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label may be subject to significant liability. However, physicians may, in their independent medical judgment, prescribe legally available products for off-label uses. The FDA does not regulate the behavior of physicians in their choice of treatments but the FDA does restrict manufacturer’s communications on the subject of off-label use of their products. Later discovery of previously unknown problems with our product candidates, including adverse events of unanticipated severity or frequency, or with our third-party suppliers or manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical studies to assess new safety risks; or imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences include, among other things:

• restrictions on the marketing or manufacturing of our product candidates, withdrawal of the product from the market or voluntary or mandatory product recalls;

• fines, warning letters or holds on clinical trials;

• refusal by the FDA to approve pending applications or supplements to approved applications filed by us or suspension or revocation of license approvals;

• product seizure or detention, or refusal to permit the import or export of our product candidates; and

• injunctions or the imposition of civil or criminal penalties.

The FDA’s and other regulatory authorities’ policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative or executive action, either in the United States or abroad. For example, certain policies of the current U.S. President’s administration may impact our business and industry. Namely, the current U.S. President’s administration has taken several executive actions, including the issuance of a number of Executive Orders, that could impose significant burdens on, or otherwise materially delay, FDA’s ability to engage in routine oversight activities such as implementing statutes through rulemaking, issuance of guidance, and

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review and approval of marketing applications. It is difficult to predict how these orders will be implemented, and the extent to which they will impact the FDA’s ability to exercise its regulatory authority. If these executive actions impose restrictions on FDA’s ability to engage in oversight and implementation activities in the normal course, our business may be negatively impacted. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability.

Even if we obtain regulatory approval of our product candidates, the products may not gain market acceptance among physicians, patients, hospitals, cancer treatment centers and others in the medical community, adversely affecting our ability to achieve our commercial and financial projections.

The use of engineered gamma delta T cells as a potential cancer treatment is a recent development and may not become broadly accepted by physicians, patients, hospitals, cancer treatment centers and others in the medical community. We expect physicians in the large bone marrow transplant centers to be particularly important to the market acceptance of our products and we may not be able to educate them on the benefits of using our product candidates for many reasons. Additional factors will influence whether our product candidates are accepted in the market, including:

• the clinical indications for which our product candidates are approved;

• physicians, hospitals, cancer treatment centers and patients considering our product candidates as a safe and effective treatment;

• the potential and perceived advantages of our product candidates over alternative treatments;

• the prevalence and severity of any side effects;

• product labeling or product insert requirements of the FDA or other regulatory authorities;

• limitations or warnings contained in the labeling approved by the FDA;

• the timing of market introduction of our product candidates as well as competitive products;

• the cost of treatment in relation to alternative treatments;

• the availability of coverage and adequate reimbursement and pricing by third-party payors and government authorities;

• the willingness of patients to pay out-of-pocket in the absence of coverage and adequate reimbursement by third-party payors and government authorities;

• relative convenience and ease of administration, including as compared to alternative treatments and competitive therapies; and

• the effectiveness of our sales and marketing efforts.

If our product candidates are approved but fail to achieve market acceptance among physicians, patients, hospitals, cancer treatment centers or others in the medical community, we will not be able to generate significant revenue. Even if our products achieve market acceptance, we may not be able to maintain that market acceptance over time if new products or technologies are introduced that are more favorably received than our products, are more cost effective or render our products obsolete.

Coverage and reimbursement may be limited or unavailable in certain market segments for our product candidates, which could make it difficult for us to sell our product candidates, if approved, profitably.

Successful sales of our product candidates, if approved, depend on the availability of coverage and adequate reimbursement from third-party payors including governmental healthcare programs, such as Medicare and Medicaid, managed care organizations and commercial payors, among others. Significant uncertainty exists as to the coverage and reimbursement status of any product candidates for which we obtain regulatory approval. In addition, because our product candidates represent new approaches to the treatment of cancer, we cannot accurately estimate the potential revenue from our product candidates.

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Patients who are provided medical treatment for their conditions generally rely on third-party payors to reimburse all or part of the costs associated with their treatment. Obtaining coverage and adequate reimbursement from third-party payors is critical to new product acceptance.

Third-party payors decide which drugs and treatments they will cover and the amount of reimbursement. Reimbursement by a third-party payor may depend upon a number of factors, including, but not limited to, the third-party payor’s determination that use of a product is:

• a covered benefit under its health plan;

• safe, effective and medically necessary;

• appropriate for the specific patient;

• cost-effective; and

• neither experimental nor investigational.

Obtaining coverage and reimbursement of a product from a government or other third-party payor is a time consuming and costly process that could require us to provide to the payor supporting scientific, clinical and cost-effectiveness data for the use of our products. Even if we obtain coverage for a given product, if the resulting reimbursement rates are insufficient, hospitals may not approve our product for use in their facility or third-party payors may require co-payments that patients find unacceptably high. Patients are unlikely to use our product candidates unless coverage is provided, and reimbursement is adequate to cover a significant portion of the cost of our product candidates. Separate reimbursement for the product itself may or may not be available. Instead, the hospital or administering physician may be reimbursed only for providing the treatment or procedure in which our product is used. Further, from time to time, CMS revises the reimbursement systems used to reimburse health care providers, including the Medicare Physician Fee Schedule and Outpatient Prospective Payment System, which may result in reduced Medicare payments. In some cases, private third-party payers rely on all or portions of Medicare payment systems to determine payment rates. Changes to government healthcare programs that reduce payments under these programs may negatively impact payments from private third-party payers and reduce the willingness of physicians to use our product candidates.

In the United States, no uniform policy of coverage and reimbursement for products exists among third-party payors. Therefore, coverage and reimbursement for products can differ significantly from payor to payor. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage for the product. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development. Because our product candidate may have a higher cost of goods than conventional therapies, and may require long-term follow-up evaluations, the risk that coverage and reimbursement rates may be inadequate for us to achieve profitability may be greater. There is significant uncertainty related to insurance coverage and reimbursement of newly approved products. It is difficult to predict at this time what third-party payors will decide with respect to the coverage and reimbursement for our product candidate. Moreover, payment methodologies may be subject to changes in healthcare legislation and regulatory initiatives. Additional state and federal healthcare reform measures are expected to be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for certain pharmaceutical products or additional pricing pressures. Specifically, there have been several U.S. Congressional inquiries and federal and state legislation designed to, among other things, bring more transparency to drug pricing, reduce the cost of prescription drugs under Medicare, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drugs. We expect to experience pricing pressures in connection with the sale of any of our product candidates due to the trend toward managed healthcare, the increasing influence of health maintenance organizations, cost containment initiatives and additional legislative changes.

We intend to seek approval to market our product candidates in both the United States and in selected foreign jurisdictions. Increased efforts by governmental and third-party payors in the United States and abroad to cap or reduce healthcare costs may cause such organizations to limit both coverage and the level of reimbursement for newly approved products and, as a result, they may not cover or provide adequate payment for our product candidate. If we obtain approval in one or more foreign jurisdictions for our product candidates, we will be subject to rules and regulations in those jurisdictions. In some foreign countries, particularly those in Europe, the pricing of biologics is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after obtaining marketing approval of a product candidate. Some of these countries may require the completion of clinical trials that compare the cost-effectiveness of a particular product candidate to currently available therapies. Other member states allow companies to fix their own prices for medicines but monitor and control company profits. The downward pressure on health care costs has become very intense. As a result, increasingly high barriers are being erected to the entry of new products. In addition, in some countries, cross-border imports from low-priced markets exert a commercial pressure on pricing within a country.

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The marketability of any product candidates for which we receive regulatory approval for commercial sale may suffer if government and other third-party payors fail to provide coverage and adequate reimbursement. We expect downward pressure on pharmaceutical pricing to continue. Further, coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

The advancement of healthcare reform may negatively impact our ability to sell our product candidates, if approved, profitably.

Third-party payors, whether domestic or foreign, or governmental or commercial, are developing increasingly sophisticated methods of controlling healthcare costs. In both the United States and certain foreign jurisdictions, there have been a number of legislative and regulatory changes to the health care system that could impact our ability to sell our product candidates, if approved, profitably. In particular, in 2010 the Affordable Care Act was enacted. The Affordable Care Act and its implementing regulations, among other things, revised the methodology by which rebates owed by manufacturers to the state and federal government for covered outpatient drugs and certain biologics, including our product candidates, under the Medicaid drug rebate program are calculated, increased the minimum Medicaid rebates owed by most manufacturers under the Medicaid drug rebate program, extended the Medicaid drug rebate program to utilization of prescriptions of individuals enrolled in Medicaid managed care organizations, subjected manufacturers to new annual fees and taxes for certain branded prescription drugs, and provided incentives to programs that increase the federal government’s comparative effectiveness research. Additionally, the Affordable Care Act allowed states to implement expanded eligibility criteria for Medicaid programs, imposed a new Medicare Part D coverage gap discount program, expanded the entities eligible for discounts under the Public Health Service pharmaceutical pricing program and implemented a new Patient-Centered Outcomes Research Institute. We are still unsure of the full impact that the Affordable Care Act will have on our business.

There remain legal and political challenges to certain aspects of the Affordable Care Act. Since January 2017, the U.S. President has signed two Executive Orders and other directives designed to delay, circumvent, or loosen certain requirements mandated by the Affordable Care Act. In December 2017, Congress repealed the tax penalty for an individual’s failure to maintain Affordable Care Act-mandated health insurance, commonly known as the “individual mandate”, as part of the Tax Cuts and Jobs Act of 2017 (“Tax Act”). In addition, the 2020 federal spending package permanently eliminated, effective January 1, 2020, the Affordable Care Act’s mandated “Cadillac” tax on high-cost employer-sponsored health coverage and medical device tax and, effective January 1, 2021, also eliminates the health insurer tax. The Bipartisan Budget Act of 2018 (“BBA”), among other things, amended the Affordable Care Act, effective January 1, 2019, to close the coverage gap in most Medicare drug plans, commonly referred to as the “donut hole”. In December 2018, CMS published a final rule permitting further collections and payments to and from certain Affordable Care Act qualified health plans and health insurance issuers under the Affordable Care Act risk adjustment program in response to the outcome of federal district court litigation regarding the method CMS uses to determine this risk adjustment. On December 14, 2018, a Texas U.S. District Court Judge ruled that the Affordable Care Act is unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax Act. Additionally, on December 18, 2019, the U.S. Court of Appeals for the 5th Circuit upheld the District Court ruling that the individual mandate was unconstitutional and remanded the case back to the District Court to determine whether the remaining provisions of the Affordable Care Act are invalid as well. It is unclear how this decision, future decisions, subsequent appeals, and other efforts to repeal and replace the Affordable Care Act will impact the Affordable Care Act and our business.

Further legislation or regulation could be passed that could harm our business, financial condition and results of operations. Other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. For example, in August 2011, President Obama signed into law the Budget Control Act of 2011, which, among other things, created the Joint Select Committee on Deficit Reduction to recommend to Congress proposals in spending reductions. The Joint Select Committee on Deficit Reduction did not achieve a targeted deficit reduction of at least $1.2 trillion for fiscal years 2012 through 2021, triggering the legislation’s automatic reduction to several government programs. This includes aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went into effect beginning on April 1, 2013 and will stay in effect through 2029, unless additional Congressional action is taken. In January 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to several types of providers, including hospitals, imaging centers and cancer treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.

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There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at broadening the availability of healthcare and containing or lowering the cost of healthcare. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our products. Such reforms could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain regulatory approval and may affect our overall financial condition and ability to develop product candidates.

In addition, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have been several recent U.S. Congressional inquiries and federal and state legislative activity designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient assistance programs, and reform government program reimbursement methodologies for drugs. At the federal level, the U.S. President’s administration’s budget proposal for fiscal year 2020 contains further drug price control measures that could be enacted during the budget process or in other future legislation, including, for example, measures to permit Medicare Part D plans to negotiate the price of certain drugs under Medicare Part B, to allow some states to negotiate drug prices under Medicaid, and to eliminate cost sharing for generic drugs for low-income patients. Further, the current U.S. President’s administration released a “Blueprint”, or plan, to lower drug prices and reduce out of pocket costs of drugs that contains additional proposals to increase drug manufacturer competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower the list price of their products, and reduce the out of pocket costs of drug products paid by consumers. HHS has solicited feedback on some of these measures and has implemented others under its existing authority. For example, in May 2019, CMS issued a final rule to allow Medicare Advantage plans the option to use step therapy for Part B drugs beginning January 1, 2020. This final rule codified CMS’s policy change that was effective January 1, 2019. While some of these and other measures may require additional authorization to become effective, Congress and the current U.S. President’s administration have each indicated that it will continue to seek new legislative and/or administrative measures to control drug costs. Individual states in the United States have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care organizations and other payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

• the demand for our product candidates, if we obtain regulatory approval;

• our ability to set a price that it believes is fair for our products;

• our ability to generate revenue and achieve or maintain profitability;

• the level of taxes that we are required to pay; and

• the availability of capital.

Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors, which may adversely affect our future profitability.

Risks Related to Our Intellectual Property

Risks Related to Third Party Intellectual Property

We depend on intellectual property licensed from third parties and termination of any of these licenses could result in the loss of significant rights, which would harm our business.

We are dependent on patents, know-how and proprietary technology, both our own and licensed from others. We depend substantially on our license agreements with Regeneron. These licenses may be terminated upon certain conditions. Any termination of these licenses could result in the loss of significant rights and could harm our ability to commercialize our product candidates. To the extent these licensors fail to meet their obligations under their license agreements, which we are not in control of, we may lose the benefits of our license agreements with these licensors. In the future, we may also enter into additional license agreements that are material to the development of our product candidates.

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Disputes may also arise between us and our licensors regarding intellectual property subject to a license agreement, including those related to:

• the scope of rights granted under the license agreement and other interpretation-related issues;

• whether and the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to the licensing agreement;

• our right to sublicense patent and other rights to third parties under collaborative development relationships;

• our diligence obligations with respect to the use of the licensed technology in relation to our development and commercialization of our product candidates, and what activities satisfy those diligence obligations; and

• the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our partners.

If disputes over intellectual property that we have licensed, or licenses in the future, prevent or impair our ability to maintain our current licensing arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

We are generally also subject to all of the same risks with respect to protection of intellectual property that we license, as we are for intellectual property that we own, which are described below. If we or our licensors fail to adequately protect this intellectual property, our ability to commercialize products could suffer.

Confidentiality agreements with employees and third parties may not prevent unauthorized disclosure of trade secrets and other proprietary information.

In addition to the protection afforded by patents, we seek to rely on trade secret protection and confidentiality agreements to protect proprietary know-how that is not patentable, processes for which patents are difficult to enforce and any other elements of our product discovery and development processes that involve proprietary know-how, information or technology that is not covered by patents. Trade secrets, however, may be difficult to protect. Although we require all of our employees to assign their inventions to us, and requires all of our employees and key consultants who have access to our proprietary know-how, information, or technology to enter into confidentiality agreements, we cannot be certain that our trade secrets and other confidential proprietary information will not be disclosed or that competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. Furthermore, the laws of some foreign countries do not protect proprietary rights to the same extent or in the same manner as the laws of the United States. As a result, we may encounter significant problems in protecting and defending our intellectual property both in the United States and abroad. If we are unable to prevent unauthorized material disclosure of our intellectual property to third parties, we will not be able to establish or maintain a competitive advantage in our market, which could materially adversely affect our business, operating results and financial condition.

Third-party claims of intellectual property infringement may prevent or delay our product discovery and development efforts.

Our commercial success depends in part on us avoiding infringement of the patents and proprietary rights of third parties. There is a substantial amount of litigation involving patents and other intellectual property rights in the biotechnology and pharmaceutical industries. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing our product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our product candidates may give rise to claims of infringement of the patent rights of others.

We are aware of U.S. and foreign patents held by a third parties relating to gamma delta T cell expansion protocols and related compositions which, on information and belief, are invalid and/or not infringed. In the event that these patents are successfully asserted against our product candidates, such as ADI-001 and ADI-002, or the use of our precursor cells in manufacture of these product candidates, such litigation may negatively impact our ability to commercialize these product candidates in such jurisdictions. We are also aware of several U.S. and foreign patents held by third parties relating to certain CAR compositions of matter, methods of making and methods of use which, on information and belief, are invalid and/or not infringed. Nevertheless, third parties may assert that we infringe their patents or are otherwise employing their proprietary

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technology without authorization and may sue us. Generally, conducting clinical trials and other development activities in the United States is not considered an act of infringement. If and when ADI-001 or ADI-002 or another CAR-based product candidate is approved by the FDA, third parties may then seek to enforce their patents by filing a patent infringement lawsuit against us. Patents issued in the United States by law enjoy a presumption of validity that can be rebutted only with evidence that is “clear and convincing,” a heightened standard of proof. We may not be able to prove in litigation that any patent enforced against it is invalid and/or not infringed.

Additionally, there may be third-party patents of which we are currently unaware with claims to materials, formulations, methods of manufacture or methods for treatment related to the use or manufacture of our product candidates. Because patent applications can take many years to issue, there may be currently pending patent applications which may later result in issued patents that our product candidates may infringe. In addition, third parties may obtain patents in the future and claim that use of our technologies infringes upon these patents. If any third-party patents were held by a court of competent jurisdiction to cover the manufacturing process of our product candidates, constructs or molecules used in or formed during the manufacturing process, or any final product itself, the holders of any such patents may be able to block our ability to commercialize the product candidate unless we obtained a license under the applicable patents, or until such patents expire or they are finally determined to be held not infringed, unpatentable, invalid or unenforceable. Similarly, if any third-party patent were held by a court of competent jurisdiction to cover aspects of our formulations, processes for manufacture or methods of use, including combination therapy or patient selection methods, the holders of any such patent may be able to block our ability to develop and commercialize the product candidate unless we obtained a license or until such patent expires or is finally determined to be held not infringed, unpatentable, invalid or unenforceable. In either case, such a license may not be available on commercially reasonable terms or at all. If we are unable to obtain a necessary license to a third-party patent on commercially reasonable terms, or at all, our ability to commercialize our product candidates may be impaired or delayed, which could in turn significantly harm our business.

Parties making claims against us may seek and obtain injunctive or other equitable relief, which could effectively block our ability to further develop and commercialize our product candidates. Defense of these claims, regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of employee resources from our business and may impact our reputation. In the event of a successful claim of infringement against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure. We cannot predict whether any such license would be available at all or whether it would be available on commercially reasonable terms. Furthermore, even in the absence of litigation, we may need to obtain licenses from third parties to advance our research or allow commercialization of our product candidates. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we would be unable to further develop and commercialize our product candidates, which could harm our business significantly.

Risks Related to Our Intellectual Property

If our efforts to protect the proprietary nature of the intellectual property related to our technologies are not adequate, we may not be able to compete effectively in our market.

We rely upon a combination of patents, trade secret protection and license agreements to protect the intellectual property related to our technologies. Any disclosure to or misappropriation by third parties of our confidential proprietary information could enable competitors to quickly duplicate or surpass our technological achievements, thus eroding our competitive position in our market.

Additional patent applications have been filed, and we anticipate additional patent applications will be filed, both in the United States and in other countries, as appropriate. However, we cannot predict:

• if and when patents will issue;

• the degree and range of protection any issued patents will afford us against competitors including whether third parties will find ways to invalidate or otherwise circumvent our patents;

• whether or not others will obtain patents claiming aspects similar to those covered by our patents and patent applications; or

• whether we will need to initiate litigation or administrative proceedings which may be costly whether we win or lose.

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Composition of matter patents for biological and pharmaceutical products such as CAR-based product candidates often provide a strong form of intellectual property protection for those types of products, as such patents provide protection without regard to any method of use. We cannot be certain that the claims in our pending patent applications covering composition of matter of our product candidates will be considered patentable by the United States Patent and Trademark Office (USPTO) or by patent offices in foreign countries, or that the claims in any of our issued patents will be considered valid and enforceable by courts in the United States or foreign countries. Method of use patents protect the use of a product for the specified method. This type of patent does not prevent a competitor from making and marketing a product that is identical to our product for an indication that is outside the scope of the patented method. Moreover, even if competitors do not actively promote their product for our targeted indications, physicians may prescribe these products “off-label.” Although off-label prescriptions may infringe or contribute to the infringement of method of use patents, the practice is common and such infringement is difficult to prevent or prosecute.

The strength of patents in the biotechnology and pharmaceutical field involves complex legal and scientific questions and can be uncertain. The patent applications that we own or in-license may fail to result in issued patents with claims that cover our product candidates or uses thereof in the United States or in other foreign countries. Even if the patents do successfully issue, third parties may challenge the patentability, validity, enforceability or scope thereof, for example through inter partes review (IPR) post-grant review or ex parte reexamination before the USPTO or oppositions and other comparable proceedings in foreign jurisdictions, which may result in such patents being cancelled, narrowed, invalidated or held unenforceable. Furthermore, even if they are unchallenged, our patents and patent applications may not adequately protect our intellectual property or prevent others from designing their products to avoid being covered by our claims. If the breadth or strength of protection provided by the patents and patent applications we hold with respect to our product candidates is threatened, it could dissuade companies from collaborating with us to develop, and threaten our ability to commercialize, our product candidates. Further, if we encounter delays in our clinical trials, the period of time during which we could market our product candidates under patent protection would be reduced. United States patent applications containing or that at any time contained a claim not entitled to a priority date before March 16, 2013 are subject to the “first to file” system implemented by the America Invents Act (2011).

This first to file system will require us to be cognizant going forward of the time from invention to filing of a patent application. Since patent applications in the United States and most other countries are confidential for a period of time after filing, we cannot be certain that it was the first to file any patent application related to our product candidates. Furthermore, for United States applications in which all claims are entitled to a priority date before March 16, 2013, an interference proceeding can be provoked by a third-party or instituted by the USPTO, to determine who was the first to invent any of the subject matter covered by the patent claims of our applications. For United States applications containing a claim not entitled to priority before March 16, 2013, there is a greater level of uncertainty in the patent law in view of the passage of the America Invents Act, which brought into effect significant changes to the United States patent laws, including new procedures for challenging patent applications and issued patents.

We may not be successful in obtaining or maintaining necessary rights to product components and processes for our development pipeline through acquisitions and in-licenses.

We may require access to additional intellectual property to develop our current or future product candidates. Accordingly, the growth of our business will likely depend in part on our ability to acquire, in-license or use these proprietary rights.

Our product candidates may also require specific formulations to work effectively and efficiently and these rights may be held by others. We may be unable to acquire or in-license any compositions, methods of use, processes or other third-party intellectual property rights from third parties that we identify. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, which would harm our business. Even if we are able to obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. In that event, we may be required to expend significant time and resources to develop or license replacement technology. We may need to cease use of the compositions or methods covered by such third-party intellectual property rights.

The licensing and acquisition of third-party intellectual property rights is a competitive area, and companies, which may be more established, or have greater resources than we do, may also be pursuing strategies to license or acquire third-party intellectual property rights that we may consider necessary or attractive in order to commercialize our product candidates. More established companies may have a competitive advantage over us due to their size, cash resources and greater clinical development and commercialization capabilities.

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We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time-consuming and unsuccessful.

Competitors may infringe our patents or the patents of our licensors. To counter infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time-consuming. In addition, in an infringement proceeding, a court may decide that one or more of our patents is not valid or is unenforceable or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. An adverse result in any litigation or defense proceedings could put one or more of our patents at risk of being invalidated, held unenforceable or interpreted narrowly and could put our patent applications at risk of not issuing. Defense of these claims, regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of employee resources from our business. In the event of a successful claim of infringement against us, we may have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure.

Interference proceedings provoked by third parties or brought by the USPTO may be necessary to determine the priority of inventions with respect to our patents or patent applications or those of our licensors. An unfavorable outcome could result in a loss of our current patent rights and could require us to cease using the related technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms. Litigation or interference proceedings may result in a decision adverse to our interests and, even if we are successful, may result in substantial costs and distract our management and other employees. We may not be able to prevent, alone or with our licensors, misappropriation of our trade secrets or confidential information, particularly in countries where the laws may not protect those rights as fully as in the United States.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock.

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment and other requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

Periodic maintenance fees on any issued patent are due to be paid to the USPTO and foreign patent agencies in several stages over the lifetime of the patent. The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process. While an inadvertent lapse can in many cases be cured by payment of a late fee or by other means in accordance with the applicable rules, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. Noncompliance events that could result in abandonment or lapse of a patent or patent application include, but are not limited to, failure to respond to official actions within prescribed time limits, non-payment of fees and failure to properly legalize and submit formal documents. In such an event, our competitors might be able to enter the market, which would have a material adverse effect on our business.

The lives of our patents may not be sufficient to effectively protect our products and business.

Patents have a limited lifespan. In the United States, the natural expiration of a patent is generally 20 years after its first effective filing date. Although various extensions may be available, the life of a patent, and the protection it affords, is limited. Even if patents covering our product candidates are obtained, once the patent life has expired for a product, we may be open to competition from biosimilar or generic medications. In addition, although upon issuance in the United States a patent’s life can be increased based on certain delays caused by the USPTO, this increase can be reduced or eliminated based on certain delays caused by the patent applicant during patent prosecution. If we do not have sufficient patent life to protect our products, our business and results of operations will be adversely affected.

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We may be subject to claims challenging the inventorship of our patents and other intellectual property.

We may in the future be subject to claims that former employees, collaborators, or other third parties have an interest in our patents or other intellectual property as an inventor or co-inventor. For example, we may have inventorship disputes arise from conflicting obligations of consultants or others who are involved in developing our product candidates. Litigation may be necessary to defend against these and other claims challenging inventorship. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, valuable intellectual property. Such an outcome could have a material adverse effect on our business. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management and other employees.

Issued patents covering our product candidates could be found unpatentable, invalid or unenforceable if challenged in court or the USPTO.

If we or one of our licensing partners initiate legal proceedings against a third party to enforce a patent covering one of our product candidates, the defendant could counterclaim that the patent covering our product candidate, as applicable, is invalid and/or unenforceable. In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace, and there are numerous grounds upon which a third party can assert invalidity or unenforceability of a patent. Third parties may also raise similar claims before administrative bodies in the United States or abroad, even outside the context of litigation. Such mechanisms include IPR, ex parte re-examination and post grant review in the United States, and equivalent proceedings in foreign jurisdictions (e.g., opposition proceedings). Such proceedings could result in revocation or amendment to our patents in such a way that they no longer cover and protect our product candidates. The outcome following legal assertions of unpatentability, invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art, of which we, our patent counsel and the patent examiner were unaware during prosecution. If a defendant were to prevail on a legal assertion of unpatentability, invalidity and/or unenforceability, we would lose at least part, and perhaps all, of the patent protection on our product candidates. Such a loss of patent protection could have a material adverse impact on our business.

Risks Related to Intellectual Property Laws

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our products.

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the biopharmaceutical industry involve both technological and legal complexity, and is therefore costly, time-consuming and inherently uncertain. Recent U.S. Supreme Court rulings have narrowed the scope of patent protection available in certain circumstances and weakened the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts, and the USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future.

We may not be able to protect our intellectual property rights throughout the world.

We may not be able to protect our intellectual property rights outside the United States. Filing, prosecuting and defending patents on product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

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Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to biopharmaceutical products, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that it develops or licenses.

We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of third parties.

We have received confidential and proprietary information from third parties. In addition, we employ individuals who were previously employed at other biotechnology or pharmaceutical companies. We may be subject to claims that we or our employees, consultants or independent contractors have inadvertently or otherwise used or disclosed confidential information of these third parties or our employees’ former employers. Litigation may be necessary to defend against these claims. Even if we are successful in defending against these claims, litigation could result in substantial cost and be a distraction to our management and employees.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Not applicable.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

None.

Item 6. Exhibits.

The exhibits filed as part of this Quarterly Report are set forth on the Exhibit Index, which is incorporated herein by reference.

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EXHIBIT INDEX

Exhibit Number		Description
3.1	Third Amended and Restated Certificate of Incorporation of the Registrant (as currently in effect) (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on January 30, 2018)
3.2	Certificate of Amendment of Third Amended and Restated Certificate of Incorporation Of resTORbio, Inc. related to the Reverse Stock Split, dated September 15, 2020 (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020).
3.3	Certificate of Amendment of Third Amended and Restated Certificate of Incorporation Of resTORbio, Inc. related to the Name Change, dated September 15, 2020 (incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020).
3.4	Amended and Restated Bylaws of the Registrant (as currently in effect) (incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on January 30, 2018)
10.1	Escrow Agreement, dated as of September 15, 2020 by and among resTORbio, Inc. and the investors listed on the Schedule of Investors attached thereto. (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020).
10.2+	Contingent Value Rights Agreement, dated as of September 15, 2020 by and among resTORbio, Inc., Computershare Inc. and Computershare Trust Company, N.A. (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.3	Second Amendment to Loan and Security Agreement, dated as of September 14, 2020, by and between Pacific West Bank and Adicet Therapeutics, Inc. (incorporated by reference to Exhibit 10.3 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.4	Third Amendment to Loan and Security Agreement, dated as of September 15, 2020, by and between Pacific West Bank and Adicet Therapeutics, Inc. (incorporated by reference to Exhibit 10.4 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.5	Form of Warrant to Purchase Common Stock issued to Beech Hill Securities, dated September 15, 2020 (incorporated by reference to Exhibit 10.5 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.6	Warrant to Purchase Common Stock issued to PacWest Bancorp, dated September 15, 2020 (incorporated by reference to Exhibit 10.6 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.7	Unconditional Secured Guaranty, dated September 15, 2020 (incorporated by reference to Exhibit 10.7 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.8	Amendment No. 1 to Loan and Security Agreement, dated as of July 8, 2020, between Adicet Therapeutics, Inc. and Pacific Western Bank (incorporated by reference to Exhibit 10.32 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.9#	First Amendment to the Adicet Bio, Inc. 2018 Stock Option and Incentive Plan (incorporated by reference to Exhibit 10.33 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 16, 2020)
10.10#	Employment Agreement, dated as of September 15, 2020, by and between the Company and Chen Schor (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 18, 2020.
10.11#	Employment Agreement, dated as of September 15, 2020, by and between the Company and Carrie Krehlik (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 18, 2020.
10.12#	Employment Agreement, dated as of September 15, 2020, by and between the Company and Francesco Galimi (incorporated by reference to Exhibit 10.3 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 18, 2020.
10.13#	Employment Agreement, dated as of September 15, 2020, by and between the Company and Lloyd Klickstein (incorporated by reference to Exhibit 10.4 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 18, 2020.
10.14#	Employment Agreement, dated as of September 15, 2020, by and between the Company and Nick Harvey (incorporated by reference to Exhibit 10.5 to the Registrant’s Current Report on Form 8-K (File No. 001-38359) filed with the SEC on September 18, 2020.
31.1*	Certification of Principal Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, as amended

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31.2*	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as amended
32.1**	Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	Inline XBRL Instance Document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*	Cover Page Interactive Data File

* Filed herewith.

** The certifications furnished in Exhibit 32.1 hereto are deemed to be furnished with this Quarterly Report on Form 10-Q and will not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, except to the extent that the Registrant specifically incorporates it by reference.

+ Pursuant to Item 601(b)(10) of Regulation S-K, certain confidential portions of this exhibit were omitted by means of marking such portions with an asterisk because the identified confidential portions (i) are not material and (ii) would be competitively harmful if publicly disclosed.

# Indicates a management contract or any compensatory plan, contract or arrangement.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ADICET BIO, INC.
Date: November 5, 2020	By:	/s/ Chen Schor
		Chen Schor
		President and Chief Executive Officer (Principal executive officer)
Date: November 5, 2020	By:	/s/ Nick Harvey
		Nick Harvey
		Chief Financial Officer (Principal financial and accounting officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO RULE 13a-14(a) / RULE 15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Chen Schor, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Adicet Bio, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Chen Schor

Chen Schor

President and Chief Executive Officer

(Principal Executive Officer)

Dated: November 5, 2020

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO RULE 13a-14(a) / RULE 15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Nick Harvey, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Adicet Bio, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Nick Harvey

Nick Harvey

Chief Financial Officer

(Principal Financial and Accounting Officer)

Dated: November 5, 2020

EX-32.1

Exhibit 32.1

CERTIFICATIONS OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Adicet Bio, Inc. (the “Company”) for the quarter ended September 30, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned hereby certify, pursuant to 18 U.S.C. Section 1350, that, to the best of their knowledge:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Chen Schor

Chen Schor

President and Chief Executive Officer

(Principal Executive Officer)

Dated: November 5, 2020

/s/ Nick Harvey

Nick Harvey

Chief Financial Officer

(Principal Financial and Accounting Officer)

Dated: November 5, 2020

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 03, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Entity Registrant Name	Adicet Bio, Inc.
Entity Central Index Key	0001720580
Trading Symbol	ACET
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-38359
Entity Tax Identification Number	81-3305277
Entity Address, Address Line One	500 Boylston Street
Entity Address, Address Line Two	13th Floor
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02116
City Area Code	857
Local Phone Number	315-5528
Entity Common Stock, Shares Outstanding		19,600,567
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE

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Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 84,960	$ 10,607
Short-term marketable debt securities	23,160	51,793
Prepaid expenses and other current assets	9,291	1,786
Total current assets	117,411	64,186
Property and equipment, net	2,043	2,121
Goodwill	20,739
In-process research and development	3,490
Restricted cash	4,527	4,282
Long-term marketable debt securities		10,588
Other non-current assets	2,187	410
Total assets	150,397	81,587
Current liabilities:
Accounts payable	3,838	1,052
Contract liabilities — related party, current	19,390	10,993
Accrued and other current liabilities	6,849	2,820
Total current liabilities	30,077	14,865
Contract liabilities — related party, net of current portion		10,890
Deferred rent, net of current portion	102	234
Redeemable convertible preferred stock warrant liability		1,881
Contingent consideration liability	2,880
Deferred tax liability	367
Other liabilities	41
Total liabilities	33,467	27,870
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, value
Common stock, $0.0001 par value, 150,000,000 and 140,200,938 shares authorized as of September 30, 2020 and December 31, 2019, respectively; 19,589,637 and 2,155,578 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	1
Additional paid-in capital	214,213	9,258
Accumulated deficit	(97,367)	(69,647)
Accumulated other comprehensive income	83	23
Total stockholders’ equity (deficit)	116,930	(60,366)
Total liabilities, redeemable convertible preferred stock, and stockholders’ equity (deficit)	$ 150,397	81,587
Redeemable Convertible Preferred Stock
Stockholders’ equity:
Preferred stock, value		$ 114,083

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Condensed Consolidated Balance Sheets (Parenthetical) (unaudited) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	140,200,938
Common stock, shares issued	19,589,637	2,155,578
Common stock, shares outstanding	19,589,637	2,155,578
Preferred Stock, par value	$ 0.0001	$ 0.0001
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Redeemable Convertible Preferred Stock
Preferred Stock, par value	$ 0.0001	$ 0.0001
Preferred stock shares authorized	0	99,363,444
Preferred stock shares issued	0	97,166,921
Preferred stock shares outstanding	0	97,166,921
Preferred stock, liquidation preference, value	$ 0	$ 128,195

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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue—related party	$ 3,028	$ (7,047)	$ 12,493	$ (974)
Operating expenses:
Research and development	8,942	6,331	24,651	17,168
General and administrative	7,741	1,847	17,684	6,069
Total operating expenses	16,683	8,178	42,335	23,237
Loss from operations	(13,655)	(15,225)	(29,842)	(24,211)
Interest income	153	276	704	561
Interest expense	(50)		(84)
Other income (expense), net	(1,224)	171	(1,174)	2,091
Loss before income tax expense (benefit)	(14,776)	(14,778)	(30,396)	(21,559)
Income tax expense (benefit)	3		(2,676)	1
Net loss	$ (14,779)	$ (14,778)	$ (27,720)	$ (21,560)
Net loss per share attributable to common stockholders, basic and diluted	$ (2.84)	$ (6.87)	$ (8.69)	$ (10.10)
Weighted-average common shares used in computing net loss per share attributable to common stockholders, basic and diluted	5,208,887	2,149,986	3,190,557	2,133,645
Other comprehensive income:
Unrealized (loss) gain on marketable debt securities, net of tax	$ (114)	$ (5)	$ 60	$ 11
Total other comprehensive (loss) income	(114)	(5)	60	11
Comprehensive loss	$ (14,893)	$ (14,783)	$ (27,660)	$ (21,549)

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Condensed Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock	Common Stock	Additional Pain In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2018	$ (33,516)		$ 1	$ 8,005	$ (41,509)	$ (13)
Balance, temporary equity, shares at Dec. 31, 2018		40,094,850
Balance, temporary equity at Dec. 31, 2018		$ 38,068
Balance, shares at Dec. 31, 2018			2,140,787
Issuance of redeemable convertible preferred stock		$ 88
Issuance of redeemable convertible preferred stock, shares		67,656
Issuance of common stock upon exercise of stock options	9			9
Issuance of common stock upon exercise of stock options, shares			4,300
Vesting of early exercised stock options	47			47
Stock-based compensation expense	251			251
Other comprehensive income	18					18
Net loss	(4,131)				(4,131)
Balance at Mar. 31, 2019	(37,322)		$ 1	8,312	(45,640)	5
Balance, temporary equity, shares at Mar. 31, 2019		40,162,506
Balance, temporary equity at Mar. 31, 2019		$ 38,156
Balance, shares at Mar. 31, 2019			2,145,087
Balance at Dec. 31, 2018	(33,516)		$ 1	8,005	(41,509)	(13)
Balance, temporary equity, shares at Dec. 31, 2018		40,094,850
Balance, temporary equity at Dec. 31, 2018		$ 38,068
Balance, shares at Dec. 31, 2018			2,140,787
Net loss	(21,560)
Unrealized (loss) gain on marketable debt securities, net of tax	11
Balance at Sep. 30, 2019	(54,129)		$ 1	8,941	(63,069)	(2)
Balance, temporary equity, shares at Sep. 30, 2019		97,166,921
Balance, temporary equity at Sep. 30, 2019		$ 114,212
Balance, shares at Sep. 30, 2019			2,152,268
Balance at Mar. 31, 2019	(37,322)		$ 1	8,312	(45,640)	5
Balance, temporary equity, shares at Mar. 31, 2019		40,162,506
Balance, temporary equity at Mar. 31, 2019		$ 38,156
Balance, shares at Mar. 31, 2019			2,145,087
Issuance of common stock upon exercise of stock options	7			7
Issuance of common stock upon exercise of stock options, shares			3,278
Stock-based compensation expense	223			223
Other comprehensive income	(2)					(2)
Net loss	(2,651)				(2,651)
Balance at Jun. 30, 2019	(39,745)		$ 1	8,542	(48,291)	3
Balance, temporary equity, shares at Jun. 30, 2019		40,162,506
Balance, temporary equity at Jun. 30, 2019		$ 38,156
Balance, shares at Jun. 30, 2019			2,148,365
Issuance of redeemable convertible preferred stock		$ 74,913
Issuance of redeemable convertible preferred stock, shares		57,004,415
Issuance of common stock upon exercise of stock options	8			8
Issuance of common stock upon exercise of stock options, shares			3,903
Termination of redeemable convertible preferred stock tranche liability		$ 1,143
Stock-based compensation expense	391			391
Other comprehensive income	(5)					(5)
Net loss	(14,778)				(14,778)
Unrealized (loss) gain on marketable debt securities, net of tax	(5)
Balance at Sep. 30, 2019	(54,129)		$ 1	8,941	(63,069)	(2)
Balance, temporary equity, shares at Sep. 30, 2019		97,166,921
Balance, temporary equity at Sep. 30, 2019		$ 114,212
Balance, shares at Sep. 30, 2019			2,152,268
Balance at Dec. 31, 2019	(60,366)			9,258	(69,647)	(23)
Balance, temporary equity, shares at Dec. 31, 2019		97,166,921
Balance, temporary equity at Dec. 31, 2019	114,083	$ 114,083
Balance, shares at Dec. 31, 2019			2,155,578
Issuance of common stock upon exercise of stock options	42			42
Issuance of common stock upon exercise of stock options, shares			19,947
Stock-based compensation expense	299			299
Net loss	(4,486)				(4,486)
Unrealized (loss) gain on marketable debt securities, net of tax	(15)					(15)
Balance at Mar. 31, 2020	(64,526)			9,599	(74,133)	8
Balance, temporary equity, shares at Mar. 31, 2020		97,166,921
Balance, temporary equity at Mar. 31, 2020		$ 114,083
Balance, shares at Mar. 31, 2020			2,175,525
Balance at Dec. 31, 2019	(60,366)			9,258	(69,647)	(23)
Balance, temporary equity, shares at Dec. 31, 2019		97,166,921
Balance, temporary equity at Dec. 31, 2019	114,083	$ 114,083
Balance, shares at Dec. 31, 2019			2,155,578
Conversion of redeemable convertible preferred stock warrants to common stock warrants	114,083
Net loss	(27,720)
Unrealized (loss) gain on marketable debt securities, net of tax	60
Balance at Sep. 30, 2020	116,930		$ 1	214,213	(97,367)	83
Balance, temporary equity, shares at Sep. 30, 2020		0
Balance, shares at Sep. 30, 2020			19,589,637
Balance at Mar. 31, 2020	(64,526)			9,599	(74,133)	8
Balance, temporary equity, shares at Mar. 31, 2020		97,166,921
Balance, temporary equity at Mar. 31, 2020		$ 114,083
Balance, shares at Mar. 31, 2020			2,175,525
Issuance of common stock upon exercise of stock options	7			7
Issuance of common stock upon exercise of stock options, shares			3,101
Stock-based compensation expense	351			351
Net loss	(8,455)				(8,455)
Unrealized (loss) gain on marketable debt securities, net of tax	189					189
Balance at Jun. 30, 2020	(72,434)			9,957	(82,588)	197
Balance, temporary equity, shares at Jun. 30, 2020		97,166,921
Balance, temporary equity at Jun. 30, 2020		$ 114,083
Balance, shares at Jun. 30, 2020			2,178,626
Issuance of common stock upon exercise of stock options	144			144
Issuance of common stock upon exercise of stock options, shares			100,092
Stock-based compensation expense	2,966			2,966
Conversion of shares of redeemable convertible preferred stock to shares of common stock in connection with the Merger	114,083		$ 1	114,082
Conversion of shares of redeemable convertible preferred stock to shares of common stock in connection with the Merger, shares		(97,166,921)
Conversion of shares of redeemable convertible preferred stock to shares of common stock in connection with the Merger		$ (114,083)
Conversion of shares of redeemable convertible preferred stock to shares of common stock in connection with the Merger, shares			12,048,671
Exchange of common stock in connection with the Merger	84,142			84,142
Exchange of common stock in connection with the Merger, shares			5,262,248
Conversion of redeemable convertible preferred stock warrants to common stock warrants	2,922			2,922
Net loss	(14,779)				(14,779)
Unrealized (loss) gain on marketable debt securities, net of tax	(114)					(114)
Balance at Sep. 30, 2020	$ 116,930		$ 1	$ 214,213	$ (97,367)	$ 83
Balance, temporary equity, shares at Sep. 30, 2020		0
Balance, shares at Sep. 30, 2020			19,589,637

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Condensed Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	3 Months Ended
	Sep. 30, 2019 USD ($)
Series B Redeemable Convertible Preferred Stock
Stock issuance cost	$ 5,087

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (27,720)	$ (21,560)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	911	962
Stock-based compensation expense	3,616	865
Gain on disposal of property and equipment		3
Net amortization of premiums and accretion discounts on investments	(4)	(143)
Change in fair value of redeemable convertible preferred stock tranche liability and TRDF liability		(2,024)
Change in fair value of redeemable convertible preferred stock warrant liability	897	(62)
Amortization of deferred debt issuance costs	84
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(5,000)	837
Other non-current assets	(1,560)	19
Accounts payable	1,442	244
Contract liabilities — related party	(2,493)	974
Deferred rent	(119)	(111)
Accrued and other current liabilities	1,738	(627)
Other liabilities	1
Net cash used in operating activities	(28,207)	(20,623)
Cash flows from investing activities
Cash and restricted cash acquired in connection with the Merger	64,114
Purchases of marketable debt securities	(5,700)	(60,056)
Proceeds from maturities of marketable debt securities	44,985	17,750
Purchases of property and equipment	(630)	(611)
Net cash provided by (used in) investing activities	102,769	(42,917)
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		77,044
Proceeds from exercise of stock options	193	24
Deferred debt issuance costs	(157)
Net cash provided by financing activities	36	77,068
Net change in cash, cash equivalents and restricted cash	74,598	13,528
Cash, cash equivalents and restricted cash, at the beginning of period	14,889	13,757
Cash, cash equivalents and restricted cash, at the end of period	89,487	27,285
Reconciliation of cash, cash equivalents and restricted cash to condensed consolidated balance sheets:
Cash, cash equivalents and restricted cash in condensed consolidated balance sheets	89,487	27,285
Supplemental cash flow information
Cash paid for income taxes	3	1
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable	76	58
Conversion of redeemable convertible preferred stock warrants to common stock warrants	114,083
Conversion of redeemable convertible preferred stock warrants into common stock warrants	2,922
Fair value of net assets acquired in Merger	84,142
Vesting of early exercised stock options		47
Issuance of redeemable convertible preferred stock warrants in connection with the Loan Agreement	$ 144
Termination of redeemable convertible preferred stock tranche liability		1,143
Settlement of TRDF liability		88
Series B Redeemable Convertible Preferred Stock
Supplemental disclosures of noncash investing and financing activities
Redeemable convertible preferred stock warrants issued in exchange for services in connection with issuance of Series B redeemable convertible preferred stock recorded as issuance costs		$ 2,131

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Organization and Nature of Business

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Nature of Business

1. Organization and Nature of the Business

Adicet Bio, Inc. (formerly resTORbio, Inc. (“resTORbio”)), together with its subsidiaries, (the “Company”) is a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases.  The Company is advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors and T cell receptor-like antibodies to enhance selective tumor targeting, facilitate innate and adaptive anti-tumor immune response, and improve persistence for durable activity in patients. The Company believes its approach has potentially significant advantages over alpha beta T cells, which are the basis of standard CAR-T cell therapies. The Company was incorporated in November 2014 in Delaware and the principal executive offices are located in Boston, Massachusetts and other office in Menlo Park, California.

Adicet Bio, Inc. (when referred to prior to the Merger (as defined below), (“Former Adicet”)) was incorporated in November 2014 in Delaware and was headquartered in Menlo Park, California. Adicet Bio Israel Ltd. (formerly Applied Immune Technologies Ltd.) (“Adicet Israel”) is a wholly owned subsidiary of Former Adicet and is located in Haifa, Israel. Adicet Israel was founded in 2006. During 2019, Former Adicet consolidated its operations, including research and development activities, in the United States and as a result substantially reduced its operations in Israel.

Merger with resTORbio

Prior to September 15, 2020, the Company was a clinical-stage biopharmaceutical company known as resTORbio that had historically focused on developing innovative medicines that target the biology of aging, to prevent or treat age-related diseases with the potential to extend healthy lifespans. On April 28, 2020, resTORbio entered into a definitive merger agreement with Former Adicet to create a combined publicly-traded biotechnology company whose anticipated focus will be on the development of the Company’s off-the-shelf allogeneic gamma delta T cell therapies for oncology and other indications. Under the terms of the merger agreement, Former Adicet agreed to merge with a wholly owned subsidiary of resTORbio in an all-stock transaction with Former Adicet surviving as a wholly-owned subsidiary of resTORbio and changing its name to “Adicet Therapeutics, Inc.” (such transactions, the “Merger”). Under the exchange ratio formula in the merger agreement, immediately following the effective time of the Merger, the securityholders of Former Adicet as of immediately prior to the effective time of the Merger owned approximately 75% of the outstanding shares of the Company’s common stock on a fully-diluted basis and securityholders of resTORbio as of immediately prior to the effective time of the Merger owned approximately 25% of the outstanding shares of the Company’s common stock on a fully-diluted basis (in each case excluding equity incentives available for grant).

The Company has concluded that the transaction represents a business combination pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 805, Business Combinations. Further, Former Adicet was determined to be the accounting acquirer based upon the terms of the Merger and other factors including: (i) Former Adicet’s securityholders own approximately 75% of the voting rights of the combined company (on a fully-diluted basis excluding equity incentives available for grant); (ii) Former Adicet designated a majority (five of seven) of the initial members of the Board of Directors of the combined company; and (iii) the terms of the exchange of equity interests based on the exchange ratio at the announcement of the Merger factored in an implied premium to resTORbio’s stockholders. The composition of senior management of the combined company was determined to be a neutral factor in the accounting acquirer determination, as the combined company will leverage the expertise of the senior management of both companies. Accordingly, the reported operating results prior to the business combination will be those of Former Adicet.

On September 15, 2020, the Company completed the Merger pursuant to the merger agreement (the “Effective Time”). In connection with the Merger, and immediately prior to the Effective Time, the Company effected a reverse stock split of the Company’s common stock at a ratio of 1-for-7 (the “Reverse Stock Split”). Also, in connection with the Merger, the Company changed its name from “resTORbio, Inc.” to “Adicet Bio, Inc.” (the “Name Change”), Former Adicet changed its name from “Adicet Bio, Inc.” to “Adicet Therapeutics, Inc.” and the business conducted by the Company became primarily the business which was previously conducted by Former Adicet, which is a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases..

At the Effective Time, each outstanding share of Former Adicet capital stock was converted into the right to receive 0.1240 (the “Exchange Ratio”) shares of Company’s common stock, as set forth in the merger agreement. The Exchange Ratio was determined based on the total number of outstanding shares of Company’s common stock and Former Adicet capital stock, each on a fully diluted basis, and the respective valuations of Former Adicet and resTORbio at the time of

execution of the Merger Agreement. In connection with the Merger, the Company also assumed certain outstanding Former Adicet warrants and Former Adicet stock options under Former Adicet’s 2015 Stock Incentive Plan (the “2015 Adicet Stock Incentive Plan”) and Former Adicet’s 2014 Share Option Plan (the “2014 Share Option Plan” and, together with the 2015 Adicet Stock Incentive Plan, the “Former Adicet Plans”), with such stock options and warrants henceforth representing the right to purchase a number of shares of Company’s common stock equal to the Exchange Ratio multiplied by the number of shares of Former Adicet’s capital stock previously represented by such stock options and warrants, as applicable, with a proportionate adjustment in exercise price. In connection with the Merger, the Company also assumed the Former Adicet Plans.

Immediately following the Effective Time, there were approximately 19,589,828 shares of the Company’s common stock outstanding (post Reverse Stock Split). Immediately following the Effective Time, the former equity holders of Former Adicet held approximately 75% of the outstanding shares of Company’s common stock on a fully-diluted basis and the former equity holders of resTORbio held approximately 25% of the outstanding shares of Company’s common stock on a fully-diluted basis (in each case excluding equity incentives available for grant).

Please refer to Note 3 “Business Combinations” for further details of the Merger.

Liquidity

The Company had $108.1 million in cash, cash equivalents, and marketable debt securities and an accumulated deficit of $97.4 million as of September 30, 2020. The Company has historically financed its operations primarily through a collaboration and licensing arrangement, through the private placement of equity securities and debt, and cash received in the Merger. To date, none of the Company’s product candidates have been approved for sale and therefore the Company has not generated any revenue from product sales. Management expects operating losses and negative cash flows to continue for the foreseeable future, until such time, if ever, that it can generate significant sales of its product candidates currently in development.

The Company expects that its cash and cash equivalents will be sufficient to fund its forecasted operating expenses, capital expenditure requirements and debt service payments for at least the next twelve months from the issuance of these condensed consolidated financial statements.

All of the Company’s revenue to date is generated from the Regeneron Agreement, which is a collaboration and license agreement. The Company does not expect to generate any significant product revenue until it obtains regulatory approval of and commercialize any of the Company’s product candidates or enter into additional collaborative agreements with third parties, and it does not know when, or if, either will occur. The Company expects to continue to incur significant losses for the foreseeable future, and it expects the losses to increase as the Company continues the development of, and seek regulatory approvals for, its product candidates and begin to commercialize any approved products. The Company is subject to all of the risks typically related to the development of new product candidates, including, but not limited to, raising additional capital, development by its competitors of new technological innovations, risk of failure in preclinical and clinical studies, safety and efficacy of its product candidates in clinical trials, the risk of relying on external parties such as contract research organizations (“CROs”) and contract manufacturing organizations (“CMOs”), the regulatory approval process, market acceptance of the Company’s products once approved, lack of marketing and sales history, dependence on key personnel and protection of proprietary technology and it may encounter unforeseen expenses, difficulties, complications, delays, and other unknown factors that may adversely affect its business.

Until such time as the Company can generate significant revenue from product sales, if ever, the Company expects to finance its operations through the sale of equity, debt financings, collaborative or other arrangements with corporate or other sources of financing.  Adequate funding may not be available to the Company on acceptable terms or at all. The Company’s failure to raise capital as and when needed could have a negative impact on its financial condition and the Company’s ability to pursue its business strategies. Although the Company continues to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The unaudited interim condensed consolidated financial statements and related disclosures have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Principles of Consolidation

The interim condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The U.S. dollar is the functional and reporting currency of the Company and its subsidiaries.

Reverse Stock Split

On September 15, 2020, immediately before the closing of the Merger, resTORbio effected a 1-for-7 reverse stock split of resTORbio’s common stock. Accordingly, all share and per share amounts for all periods presented in the accompanying condensed consolidated financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split. No fractional shares were issued in connection with the Reverse Stock Split. Unless otherwise noted, all references to common stock share and per share amounts have also been adjusted to reflect the exchange ratio of 0.1240.

Unaudited Interim Financial Information

The condensed consolidated balance sheet as of December 31, 2019 was derived from the Company’s audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of September 30, 2020 and for the three and nine months ended September 30, 2020 and 2019, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2019 included in the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 16, 2020. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of September 30, 2020 and condensed consolidated results of operations for the three and nine months ended September 30, 2020 and 2019 and condensed consolidated cash flows for the nine months ended September 30, 2020 and 2019 have been made. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2020.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements as well as the reported amounts of revenues and expenses during the reporting period. Such estimates include the valuation of the intangible assets acquired in business combinations, redeemable convertible preferred stock warrant liability, redeemable convertible preferred stock tranche liability, the Technion Research and Development Foundation liability (“TRDF Liability”), contingent consideration liability for contingent value right (“CVR”), deferred tax assets, useful lives of property and equipment, accruals for research and development activities, revenue recognition and stock-based compensation. Actual results could differ from those estimates. The current COVID-19 (coronavirus) pandemic, which is impacting worldwide economic activity, poses risk that the Company or its employees, contractors, suppliers, and other partners may be prevented from conducting business activities for an indefinite period of time, including due to shutdowns that may be requested or mandated by governmental authorities. The extent to which the coronavirus impacts the Company’s operations will depend on future developments, which are highly uncertain and cannot be predicted with confidence, including the duration of the outbreak, new information that will emerge concerning the severity of the coronavirus and the actions to contain the coronavirus or treat its impact, among others. COVID-19 may impact the timing of regulatory approval of the INDs for clinical trials, the enrollment of any clinical trials that are approved, the availability of clinical trial materials and regulatory approval and commercialization of our products. COVID-19 may also impact the Company’s ability to access capital, which could negatively impact short-term and long-term liquidity.

Business Combinations

Business combinations are accounted for under the acquisition method. The Company recognizes the assets acquired and liabilities assumed in business combinations on the basis of their fair values at the date of acquisition. The Company assesses the fair value of assets acquired, including intangible assets, and liabilities assumed using a variety of methods. Each asset acquired and liability assumed is measured at fair value from the perspective of a market participant. The method used to estimate the fair values of intangible assets incorporates significant estimates and assumptions regarding the estimates a market participant would make in order to evaluate an asset, including a market participant’s use of the asset, future cash inflows and outflows, probabilities of success, asset lives, and the appropriate discount rates. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Any excess purchase price over the fair value of the net tangible and intangible assets acquired is allocated to goodwill. Transaction costs and restructuring costs associated with a business combination are expensed as incurred.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the condensed consolidated statements of operations as operating expenses or income.

Contingent Consideration Liability

The estimated fair value of contingent consideration liability, initially measured and recorded on the acquisition date, is considered to be a Level 3 instrument. The contingent consideration liability is recorded at fair value at the end of each reporting period with changes in estimated fair values recorded in research and development expenses in the condensed consolidated statements of operations.

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net tangible and identified intangible assets acquired in a business combination. Goodwill is not amortized but is evaluated at least annually for impairment or when a change in facts and circumstances indicate that the fair value of the goodwill may be below its carrying value.

Goodwill is tested for impairment at the reporting unit level annually in the fourth quarter, or more frequently when events or changes in circumstances indicate that the asset might be impaired. Examples of such events or circumstances include, but are not limited to, a significant adverse change in legal or business climate, an adverse regulatory action or unanticipated competition. The Company has determined that it operates in a single operating segment and has a single reporting unit.

Prior to performing the impairment test, the Company assesses qualitative factors to determine whether the existence of events or circumstances would indicate that it is more likely than not that the fair value of the reporting unit was less than its carrying amount. If after assessing the totality of events or circumstances, the Company were to determine that it is more likely than not that the fair value of the reporting unit is less than its carrying amount, then the Company would perform a quantitative impairment test.

The quantitative impairment test involves comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets, goodwill is not impaired, and no further testing is required. If the fair value of the reporting unit is less than the carrying value, the Company measures the amount of impairment loss, if any, as the excess of the carrying value over the fair value of the reporting unit. The Company has determined there were no indicators of goodwill impairment as of September 30, 2020.

Intangible Assets

In connection with the Merger, the Company acquired certain IPR&D assets, which were classified as indefinite-lived intangible assets. Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires and have not been completed at the acquisition date. The fair value of IPR&D acquired in a business combination is recorded on the Company’s condensed consolidated balance sheets at the acquisition-date fair value and is determined by estimating the costs to develop the technology into commercially viable products, estimating the resulting revenue from the products, and discounting the projected net cash flows to present value. IPR&D is not amortized, but rather is reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned, or transferred to a third party.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB ASC or other standard setting bodies and adopted by the Company as of the specified effective date, unless otherwise discussed below.

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. The new disclosure requirements include disclosure related to changes in unrealized gains or losses included in other comprehensive income (loss) for recurring Level 3 fair value measurements held at the end of each reporting period and the explicit requirement to disclose the range and weighted-average of significant unobservable inputs used for Level 3 fair value measurements. This ASU removes the requirement to disclose: the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. For all entities, this ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company adopted this ASU effective January 1, 2020. The adoption of this ASU did not have a material effect on the Company’s condensed consolidated financial statements and related disclosures.

Recently Issued Accounting Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) (“ASU 2020-04”). The amendments in ASU 2020-04 provide optional expedients and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. An entity may elect to apply the amendments for contract modifications by Topic or Industry Subtopic as of any date from the beginning an interim period that includes or is subsequent to March 12, 2020, or prospectively from the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic, the amendments must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. The Company may elect to apply ASU 2020-04 as its contracts referenced in London Interbank Offered Rate (“LIBOR”) are impacted by reference rate reform. The Company is currently evaluating the impact of the adoption of this ASU on the Company’s consolidated financial statements.

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Business Combination

9 Months Ended

Sep. 30, 2020

Business Combinations [Abstract]

Business Combination

3. Business Combination

On September 15, 2020, Former Adicet completed its merger with resTORbio. Based on the Exchange Ratio of 0.1240, immediately following the Merger, resTORbio stockholders and holders of resTORbio restricted stock units and options to acquire resTORbio common stock owned approximately 25.0% of the outstanding capital stock of the combined company on a fully diluted basis, and Former Adicet stockholders, holders of options or warrants to acquire Former Adicet capital stock owned approximately 75.0% of the outstanding capital stock of the combined company on a fully diluted basis. At the closing of the Merger, all shares of Former Adicet common stock and Former Adicet redeemable convertible preferred stock then outstanding were converted to Former Adicet’s common stock under their original terms and were then exchanged for the Company’s common stock.

resTORbio’s stockholders will continue to own and hold their existing shares of the Company’s common stock (after giving effect to the 1-for-7 reverse stock split). Pursuant to the terms of the Merger, the vesting of all outstanding resTORbio stock options was accelerated in full as of immediately prior to the Effective Time. All out-of-the-money resTORbio stock options were cancelled for no consideration. All in-the-money resTORbio stock options remained outstanding after the completion of the Merger in accordance with their terms. For accounting purposes, the Company assumed 81,370 in-the-money resTORbio stock options after giving effect to reverse stock split. In addition, 91,309 unvested resTORbio restricted stock units outstanding and unsettled, after giving effect to reverse stock split, as of immediately prior to the effective time of the Merger, were accelerated in full  and the holders of such restricted stock units  received 55,854 shares of the Company’s common stock (after reduction by the number of shares of resTORbio common stock necessary to satisfy applicable tax withholding obligations at the maximum statutory rate). The fair value of these modified stock options and restricted stock units attributable to pre-combination services was recorded as a component of consideration transferred and the fair value of these modified stock options and restricted stock units attributable to post-combination services was recognized as stock compensation expense in the Company’s condensed consolidated statement of operations. 

In connection with the Merger, the Company entered into a Contingent Value Rights Agreement (the “CVR Agreement”) with Computershare Inc. and Computershare Trust Company, N.A. as joint rights agent. Per the terms of the Merger, each holder of resTORbio common stock as of immediately prior to the completion of the Merger is entitled to one contractual contingent value right, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the Effective Time. The CVR holders are entitled to receive net proceeds from the commercialization, if any, received from a third-party commercial partner of RTB101, resTORbio’s small molecule product candidate that is a potent inhibitor of target of rapamycin complex 1 (TORC1), for a COVID-19 related indication. The CVR is accounted for as contingent consideration, the fair value of which was determined using an income approach. This approach utilized a probability adjusted discounted cash flow that would accrue to the Company and then deducting the administrative fee to be retained by the Company and other permitted deductions in order to arrive at the net cash expected to be paid out to the CVR holders. These cash flows were then discounted to present value using the same discount rate applied in the valuation of the IPR&D. The probability adjusted discounted cash flow includes significant estimates and assumptions pertaining to commercialization events and cash consideration received by the Company for the grant of rights to commercialize RTB101 during the term of the CVR Agreement. The most significant unobservable inputs are the probabilities of achieving regulatory approval of the development projects and subsequent commercial success. Significant changes in any of the probabilities of success would result in a significantly higher or lower fair value measurement. Significant changes in the probabilities as to the periods in which commercialization of RTB101 will be achieved would result in a significantly lower or higher fair value measurement. (refer to Note 4 “Fair Value Measurements”).

The total purchase price has been allocated to the tangible and intangible assets acquired and liabilities assumed of resTORbio based on their fair values as of the completion of the Merger, with the excess allocated to goodwill. The purchase price is calculated based on the fair value of resTORbio common stock that the resTORbio stockholders owned as of the closing date of the merger because, with no active trading market for shares of Adicet, the fair value of the resTORbio’s common stock represented a more reliable measure of the fair value of consideration transferred in the Merger. The following summarizes the purchase price in the Merger (in thousands, except share and per share amounts):

Fair value of common stock shares of the combined company    owned by resTORbio stockholders (1)	$	83,516
Fair value of contingent consideration liability with respect to CVR (2)		2,880
Estimated fair value of modified stock options and    restricted stock units attributable to pre-combination services (3)		626
Purchase price	$	87,022

(1) Represents the share consideration of the combined company that the resTORbio stockholders own as of the closing of the merger calculated as follows:

Number of shares of the combined company owned by resTORbio    stockholders (a)		5,207,695
Multiplied by the fair value per share of resTORbio common    stock (b)	$	16.59
Acquisition date fair value of resTORbio		86,396
Less: portion of the fair value to be distributed as CVR (c)		(2,880	)
Fair value of shares of the combined company  owned by resTORbio    stockholders	$	83,516

a. Represents the number of shares of common stock of the combined company that the resTORbio stockholders owned as of the closing of the merger. This amount is calculated as 5,207,695 shares of resTORbio common stock outstanding as of September 15, 2020.

b. The purchase price is based on the closing price of resTORbio common stock on September 14, 2020.

c. The fair value of resTORbio common stock was further adjusted to remove the estimated fair value of the CVR embedded within the closing price, as each holder of resTORbio stock will receive one contractual CVR immediately prior to the Merger.

(2) Each holder of resTORbio common stock as of immediately prior to the completion of the merger was entitled to one CVR issued by resTORbio, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the effective time of the Merger

(3) Based on the capitalization of resTORbio as of September 15, 2020, 91,309 outstanding unvested resTORbio restricted stock units were accelerated in connection with the merger and holders of the restricted stock units were issued approximately 55,854 shares of resTORbio common stock on a net settlement basis. Similarly, in connection with the merger, vesting of outstanding resTORbio stock options was accelerated in full and the stock options that were not in the in-the-money on the close of the merger were canceled, resulting in approximately 81,370 surviving stock options. The acquisition date fair value of these modified resTORbio restricted stock units and resTORbio stock options attributable to the pre-combination services is included in the estimated purchase price.

The Merger was accounted for as a business combination which requires that assets acquired and liabilities assumed be recognized at their fair value as of the acquisition date. While the Company uses its best estimates and assumptions as part of the purchase price allocation process to value the assets acquired and liabilities assumed on the acquisition date, its estimates and assumptions are subject to refinement. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can materially impact the Company’s results of operations. The purchase price allocation is preliminary and is subject to change, including for the valuation of intangible assets and contingent consideration, income taxes and related valuation allowances and certain assets and liabilities among other items. The amounts recognized will be finalized as the information necessary to complete the analysis is obtained, but no later than one year after the acquisition date. Any potential adjustments made could be material in relation to the preliminary values presented below.

The following summarizes the allocation of the purchase price to the net tangible and intangible assets acquired (in thousands):

Net assets acquired:
Cash and cash equivalents	$	63,869
Prepaid expenses and other current assets		2,505
Property and equipment		318
IPR&D		3,490
Restricted cash		245
Accounts payable		(1,316	)
Accrued and other current liabilities		(2,421	)
Other liabilities		(40	)
Deferred tax liability		(367	)
Goodwill		20,739
Purchase price	$	87,022

The goodwill of $20.7 million is not tax deductible and represents the excess of the consideration paid over the fair value of assets acquired and liabilities assumed. Goodwill is mainly attributable to the enhanced value of the combined company, as reflected in the increase in market value of the resTORbio common shares following the announcement of the Merger with Former Adicet.

The fair value of acquired IPR&D related to the research and development of RTB101 for a COVID-19 related indication. The RTB101 compound IPR&D project was valued using an income approach, specifically a projected discounted cash flow method, adjusted for the probability of technical success (“PTS”). The projected discounted cash flow models used to estimate the Company’s IPR&D reflect significant assumptions regarding the estimates a market participant would make in order to evaluate a drug development asset, including the following:

- Estimates of potential cash flows to be generated by the project and resulting asset, which was developed utilizing estimates of total patient population, market penetration rates, demand risk adjustment factors, and product pricing;

- Estimates regarding the timing of and the expected costs of goods sold, research and development expenses, selling, general and administrative expenses to advance the clinical programs to commercialization, cash flow adjustments and partner profit split;

- The projected cash flows were then adjusted using PTS factors that were selected considering both the current state of clinical development and the nature of the proposed indication, (i.e., respiratory therapeutics.); and

- Finally, the resulting probability adjusted cash flows were discounted to a present value using a risk-adjusted discount rate, developed considering the market risk present in the forecast and the size of the asset.

This IPR&D intangible asset is not amortized, but rather are reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned, or transferred to a third party.

The contingent consideration for the CVR was valued using an income approach, leveraging the probability adjusted discounted cash flow that would accrue to the combining company and then deducting the administrative fee to be retained by the combined company and other permitted deductions in order to arrive at the net cash expected to be paid out to the CVR holders. The probability adjusted cash flow includes significant estimates and assumptions pertaining to commercialization events and cash consideration received by the Company for the grant of rights to commercialize RTB101 during the term of the CVR Agreement (as discussed above). These cash flows were then discounted to present value using the same discount rate applied in the valuation of the IPR&D.

Transaction costs for the Merger were $2.1 million and $7.1 million for the three month and nine month ended September 30, 2020, respectively and were expensed as incurred in general and administrative expenses in the condensed consolidated statements of operations.

The following supplemental unaudited pro forma information represents the Company’s financial results as if the acquisition of resTORbio had occurred on January 1, 2019 (in thousands).

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Revenue	$	3,028		$	(7,047	)	$	12,493		$	(974	)
Net loss	$	(9,791	)	$	(53,794	)	$	(26,424	)	$	(100,142	)

The above unaudited pro forma information was determined based on the historical GAAP results of the Company and resTORbio. The unaudited pro forma consolidated results are not necessarily indicative of what the Company’s consolidated results of operations would have been if the acquisition was completed on January 1, 2019. The unaudited pro forma consolidated net loss includes pro forma adjustments primarily relating to the reclassification of transaction costs and severance payments directly related to the closing of the Merger of $8.6 million from the three months ended September 30, 2020 to the three months ended September 30, 2019 and $15.6 million from the nine months ended September 30, 2020 to the nine months ended September 30, 2019. The unaudited proforma information include proforma adjustments to eliminate the impact of the change in the fair value of redeemable convertible preferred stock tranche liability, TRDF liability, and redeemable convertible warrant liability during the three and nine months ended September 30, 2020 and September 30, 2019 as the redeemable convertible preferred stock tranche liability, TRDF liability, and redeemable convertible warrant liability did not exist once the redeemable convertible preferred stock were converted to common stock in the Merger. The unaudited proforma information also includes proforma adjustments to reclassify stock compensation expense related to the conversion of resTORbio stock options and restricted stock units and the modification of stock option awards to Former Adicet CEO in connection with the Merger to January 1, 2019. Further, stock compensation expense related to resTORbio stock options and restricted stock units recognized in the books of resTORbio prior to the Merger in 2019 and 2020 was reversed in the proforma information.

Former Chief Executive Officer’s Transition Agreement

On April 28, 2020, in connection with the Merger the Company entered into a transition agreement with Anil Singhal, Former Adicet’s Chief Executive Officer and President, pursuant to which Dr. Singhal transitioned from his role as Chief Executive Officer and President to an advisory role immediately after the closing of the Merger. In accordance with such agreement, Dr. Singhal is entitled to the following compensation: (1) cash payments of (i) $470,000 within 60 days following the closing of the Merger, (ii) an amount equal to his pro-rated bonus of $212,000 for the 2020 calendar year payable within 60 days following the closing of the Merger, (iii) $250,000 payable in one lump sum on January 1, 2021 and (iv) $24,000 payable within 60 days following the closing of the Merger, (2) 12 months’ of accelerated vesting of his unvested options to purchase the Company’s common stock upon completion of the Merger, and (3) a 12-month post-termination exercise period following termination of his independent contractor services agreement, dated April 28, 2020 (the “ICSA”), subject to any earlier expiration of the options to purchase the Company’s common stock by their terms. In addition, Dr. Singhal is entitled to reimbursement of up to $15,000 of his reasonable and documented legal expenses incurred in connection with such transition agreement. Pursuant to such agreement, subject to Dr. Singhal’s continued service through the completion of the Merger and contingent on completion of the Merger, Dr. Singhal’s continued service for purposes of vesting of his options to purchase the Company’s common stock will continue until the earlier of (i) May 7, 2021 or (ii) termination of the ICSA, provided, however, if the ICSA is terminated early without cause, Dr. Singhal is entitled to accelerated vesting of unvested options that would have vested from the date of such termination through May 7, 2021. In addition, Dr. Singhal’s existing options acceleration provisions will terminate. Pursuant to the ICSA, Dr. Singhal will provide certain advisory services to the Company for a term of 12 months following the closing of the merger and is entitled to payments of $12,500 per month for such services.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements

The Company determines the fair value of financial and non-financial assets and liabilities using the fair value hierarchy which establishes three level of inputs that may be used to measure fair value, as follows:

Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities.

Level 2— Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3— Unobservable inputs which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value.

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	September 30, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	10	$	—	$	—	$	10
Cash equivalents(1)		10		—		—		10
Asset-backed securities		—		14,689		—		14,689
Corporate debt securities		—		5,722		—		5,722
Commercial paper		—		2,749		—		2,749
Marketable debt securities		—		23,160		—		23,160
Total fair value of assets	$	10	$	23,160	$	—	$	23,170
Liabilities:
Contingent consideration	$	—	$	—	$	2,880		2,880
Total fair value of liabilities	$	—	$	—	$	2,880	$	2,880

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	7,232	$	—	$	—	$	7,232
Cash equivalents(1)		7,232		—		—		7,232
Asset-backed securities		—		19,598		—		19,598
Corporate debt securities		—		19,394		—		19,394
Commercial paper		—		17,892		—		17,892
U.S. Government agency bonds		—		5,497		—		5,497
Marketable debt securities		—		62,381		—		62,381
Total fair value of assets	$	7,232	$	62,381	$	—	$	69,613
Liabilities:
Redeemable convertible preferred stock warrant    liability	$	—	$	—	$	1,881		1,881
Total fair value of liabilities	$	—	$	—	$	1,881	$	1,881

(1) Included in cash and cash equivalents in the condensed consolidated balance sheets

The following tables presents a summary of the changes in the fair value of the Company’s Level 3 financial instruments (in thousands):

	Redeemable Convertible Preferred Stock Tranche Liability			TRDF Liability			Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2018	$	3,113		$	142		$	—
Recognition of preferred stock warrant liabilities		—			—			2,131
Change in the fair value included in other income, net		(1,970	)		(54	)		(62	)
Settlement		—			(88	)		—
Termination		(1,143	)		—			—
Fair value as of September 30, 2019	$	—		$	—		$	2,069

	Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2019	$	1,881
Recognition of preferred stock warrant liability		144
Change in the fair value included in other income, net		897
Conversion of convertible preferred stock warrant into common stock warrant    in connection with Merger		(2,922	)
Fair value as of September 30, 2020	$	—

The fair value of the redeemable convertible preferred stock tranche liability, TRDF Liability and the redeemable convertible preferred stock warrant liability is based on significant unobservable inputs, which represent Level 3 measurements within the fair value hierarchy. In determining the fair value of the redeemable convertible preferred stock tranche liability and the redeemable convertible preferred stock warrants, the Company used the Black-Scholes option-pricing model to estimate the fair value using unobservable inputs including the expected term, expected volatility, risk-free interest rate and dividend yield (see Note 14). There were no warrants outstanding for the purchase of redeemable convertible preferred stock as of September 30, 2020, as all such warrants were converted to warrants for the purchase of shares of common stock upon the Merger. The fair value of the TRDF Liability was determined based on fair value of the Company’s Series A redeemable convertible preferred stock.

As part of the acquisition of resTORbio, the Company entered into a CVR Agreement and recorded the fair value of the CVR as part of consideration transferred. The Company considers the contingent consideration liability a Level 3 instrument (one with significant unobservable inputs) in the fair value hierarchy (see Note 3).

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Marketable Debt Securities

9 Months Ended

Sep. 30, 2020

Investments Debt And Equity Securities [Abstract]

Marketable Debt Securities

5. Marketable Debt Securities

The following table summarizes the Company’s marketable debt securities (in thousands):

	September 30, 2020
	Amortized Cost		Unrealized Losses		Unrealized Gains		Fair Value
Asset-backed securities	$	14,639	$	—	$	50	$	14,689
Corporate debt securities		5,700		—		22		5,722
Commercial paper		2,738		—		11		2,749
Total	$	23,077	$	—	$	83	$	23,160

	December 31, 2019
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Asset-backed securities	$	19,589	$	(1	)	$	10	$	19,598
Corporate debt securities		19,387		(3	)		9		19,393
Commercial paper		17,882		—			11		17,893
U.S. Government agency bonds		5,500		(3	)		—		5,497
Total	$	62,358	$	(7	)	$	30	$	62,381

The following table summarizes the classification of the Company’s marketable debt securities in the condensed consolidated balance sheets (in thousands):

	September 30,		December 31,
	2020		2019
Short-term marketable debt securities		23,160		51,793
Long-term marketable debt securities		—		10,588
Total	$	23,160	$	62,381

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Prepaid Expenses and Other Current Assets

9 Months Ended

Sep. 30, 2020

Prepaid Expense And Other Assets Current [Abstract]

Prepaid Expenses and Other Current Assets

6. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Prepaid expenses	$	2,416	$	615
Prepaid insurance		3,353		57
Tax receivable		3,400		722
Interest receivable		67		213
Other current assets		55		179
Total prepaid expenses and other current assets	$	9,291	$	1,786

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Property and Equipment, Net

9 Months Ended

Sep. 30, 2020

Property Plant And Equipment [Abstract]

Property and Equipment, Net

7. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	Useful life (in years)		September 30, 2020			December 31, 2019
Laboratory equipment	3		$	4,305		$	3,872
Leasehold improvements	Lesser of useful life or lease term		$	1,406		$	1,327
Furniture and fixtures	3			526			68
Construction in progress		—		94			300
Computer equipment	3			91			42
Software	3			170			150
				6,592			5,759
Less: Accumulated depreciation and amortization				(4,549	)		(3,638	)
Property and equipment, net			$	2,043		$	2,121

Depreciation and amortization expense was $0.3 million and $0.9 million for the three and nine months ended September 30, 2020, respectively. Depreciation and amortization expense was $0.3million and $1.0 million for three and nine months ended September 30, 2019, respectively.

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Accrued and Other Current Liabilities

9 Months Ended

Sep. 30, 2020

Payables And Accruals [Abstract]

Accrued and Other Current Liabilities

8. Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Accrued compensation	$	4,455	$	1,359
Accrued research and development expenses		552		450
Accrued professional services		1,016		301
Accrued other liabilities		826		710
Total accrued and other liabilities	$	6,849	$	2,820

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Term Loan

9 Months Ended

Sep. 30, 2020

Term Loan [Abstract]

Term Loan

9. Term Loan

On April 28, 2020, the Company entered into a Loan and Security Agreement with Pacific Western Bank for a term loan not exceeding $12.0 million (the “Loan Agreement”) to finance leasehold improvements for its new corporate headquarters in Redwood City, California and other purposes permitted under the Loan Agreement, with an interest rate equal to the greater of 0.25% above the Prime Rate (as defined in the Loan Agreement) or 5.00%. The Loan Agreement granted to Pacific Western Bank a security interest on substantially all of the Company’s assets other than intellectual property to secure the performance of the Company’s obligations under the Loan Agreement, and contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets or distributions, limitations on the incurrence of additional debt or liens and other customary requirements. As of September 30, 2020, the Company was in compliance with such covenants and had no indebtedness outstanding under the Loan Agreement.

In connection with the entrance into the Loan Agreement, the Company issued Pacific Western Bank a warrant to purchase shares of its Series B redeemable convertible preferred stock at an exercise price of $1.4034 per share (the “Existing PacWest Warrant”). The Existing PacWest Warrant was initially exercisable for 42,753 shares of the Company’s Series B redeemable convertible preferred stock (not adjusted for the Exchange Ratio) and will be exercisable for an additional number of shares of its Series B redeemable convertible preferred stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 128,260 shares of the Company’s Series B redeemable convertible preferred stock (not adjusted for the Exchange Ratio). Pursuant to the terms of the Existing PacWest Warrant and the merger agreement (see Note 3), at the effective time of the merger, the Company issued a new common stock warrant to Pacific Western Bank (the “New PacWest Warrant”) which replaced the Existing PacWest Warrant. The New PacWest Warrant is initially exercisable solely for 5,301 shares of the Company’s common stock will be exercisable for an additional number of shares of the Company’s common stock equal to 1.00% of the aggregate original principal amount of all term loans made pursuant to the Loan Agreement (up to an aggregate maximum of 15,903 shares of the Company’s common stock). Any restriction on the exercise set forth in the Existing PacWest Warrant are in full force and effect in the New PacWest Warrant and the term, exercisability, vesting schedule and other provisions of the Existing PacWest warrant otherwise remain unchanged in the New PacWest Warrant.

The Company may request to draw upon the term loan at any time through the date eighteen months after the date of the Loan Agreement (“Availability End Date”), which is October 28, 2021. As of September 30, 2020, no amounts have been drawn under the Loan Agreement. Further, the New PacWest Warrant to purchase 5,301 shares of the Company’s common stock is immediately exercisable. However, none of the warrants have been exercised as of September 30, 2020.

At issuance, the Company accounted for the fair value of the Existing PacWest Warrant, determined to be $0.1 million, as a liability and as a corresponding deferred debt issuance cost which was amortized on a straight-line basis until the Availability End Date in interest expenses. The liability was adjusted to fair value each reporting period through earnings.  Upon issuance of the New PacWest Warrant, the liability was reclassified to additional paid-in capital and is no longer subject to remeasurement at fair value. The fair value of the New PacWest Warrant was equal to the fair value of the Existing PacWest Warrant on the Merger date.  Accordingly, no incremental expense was recognized at the Merger date.

Upon each draw of the term loan, the Company will derecognize the proportionate unamortized amount of the deferred asset and account for it as a debt discount to the drawn term loan. The debt discount will be presented in the

consolidated balance sheet as a direct adjustment to the carrying value of the term loan. The debt discount will be amortized using the effective interest rate method over the term of the debt and recorded as an interest expense.

As of September 30, 2020, the deferred debt issuance costs were $0.2 million and are included in other non-current assets on the Company’s condensed consolidated balance sheets.

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Regeneron License and Collaboration Arrangement

9 Months Ended

Sep. 30, 2020

Revenue Recognition And Deferred Revenue [Abstract]

Regeneron License and Collaboration Arrangement

10. Regeneron License and Collaboration Arrangement

Agreement Terms

On July 29, 2016, the Company entered into a License and Collaboration Agreement with Regeneron Pharmaceuticals, Inc. (“Regeneron”) to develop engineered immune-cell therapeutics using the universal immune cell therapies platform (the “Regeneron Agreement”).

The Company received a non-refundable upfront payment of $25.0 million from Regeneron upon execution of the Regeneron Agreement, and has received an aggregate of $20.0 million of additional payments for research funding from Regeneron under the Regeneron agreement. In addition, Regeneron may have to pay the Company additional amounts in the future consisting of up to an aggregate of $100 million of option exercise fees, in each case as specified in the Regeneron Agreement. Regeneron must also pay the Company high single digit royalties as a percentage of net sales for ICPs to targets for which it has exclusive rights, and low single digit royalties as a percentage of net sales on any non-ICP product comprising a target generated by the Company through the use of Regeneron’s proprietary mice. The Company must pay Regeneron mid-single to low-double digit royalties as a percentage of net sales of ICPs to targets for which the Company has exercised exclusive rights, and low-to mid-single digit royalties as a percentage of net sales of targeting moieties generated from the Company’s license to use Regeneron’s proprietary mice. Royalties are payable until the longer of the expiration or invalidity of the licensed patent rights or 12 years from first commercial sale.

Revenue Recognition

For revenue recognition purposes, the Company determined that the duration of the contract is the same as the research term of five (5) years beginning on the execution of the Regeneron Agreement on July 29, 2016. The contract duration is defined as the period during which parties to the contract have present and enforceable rights and obligations. The Company determined that Regeneron faces significant in-substance penalties were it to terminate the Regeneron Agreement prior to the end of the research.

At contract inception, the Company determined a transaction price of the Regeneron Agreement consisting of the $25.0 million upfront payment and the aggregate research funding fees payable over the research term. In order to determine the transaction price, the Company evaluated all the payments to be received during the duration of the contract. Per the terms of the original Regeneron Agreement prior to the amendment effective from July 2019, the research funding fees were payable merely due to the passage of time and therefore did not represent a variable consideration. After the amendment became effective in July 2019, certain of these fees became contingent upon meeting certain development and regulatory milestones. Therefore, the Company concluded that after the amendment such potential payments became variable consideration. The receipt of the variable consideration was subject to substantial uncertainty and was therefore excluded from the transaction price upon the effective date of the amendment. As a result, during the three months ended September 30, 2019, the Company recorded $6.6 million as a reduction to cumulative revenue recognized prior to the amendment effective date. The Company will re-evaluate the transaction price if there is a significant change in facts and circumstances at least at the end of each reporting period. The Company increased the transaction price by $10.0 million in June 2020 when it achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement, resulting in a recognition of cumulative revenue of $5.0 million during the three months ended June 30, 2020.

For the three months ended September 30, 2020 and 2019, the Company recognized $3.0 million and $(7.0) million of license and collaboration revenue, respectively. For the nine months ended September 30, 2020 and 2019, the Company recognized $12.5 million and $(1.0) million of license and collaboration revenue, respectively.

The following tables present changes in the Company’s contract liabilities for the three and nine months ended September 30, 2020 and 2019 (in thousands):

Nine Months Ended September 30, 2020	Balance at beginning of period		Additions		Additions (Deductions) (1)			Balance at end of period
Contract asset	$	—	$	10,000	$	(10,000	)	$	—
Contract liability	$	21,883	$	10,000	$	(12,493	)	$	19,390

Nine Months Ended September 30, 2019	Balance at beginning of period		Additions		Additions (Deductions) (1)		Balance at end of period
Contract liability	$	22,878	$	—	$	974	$	23,852

⁽¹⁾ Additions (deductions) to contract liabilities relate to deferred revenue derecognized (recognized) as revenue during the reporting period.

Contract assets are reflected as accounts receivable—related party on the condensed consolidated balance sheet. The Company achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement in June 2020 and was entitled to receive a payment of $10.0 million from Regeneron. The Company received the payment from Regeneron in July 2020.

Contract liabilities related to the Regeneron Agreement of $19.4 million and $23.9 million as of September 30, 2020 and 2019, respectively, which was comprised of the $25.0 million upfront payment and additional $5.0 million research funding fees in each of 2017 and 2018, and $10.0 million for achievement of the milestone for the selection of a clinical candidate to the second collaboration target in June 2020, less $25.6 million and $11.1 million of cumulative license and collaboration revenue recognized from the inception of the Regeneron Agreement as of September 30, 2020 and 2019, respectively, and will be recognized as the combined performance obligation is satisfied.

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License Funding and Other Agreements Related to the CVR

9 Months Ended

Sep. 30, 2020

License Funding And Other Agreements [Abstract]

License, Funding and Other Agreements Related to the CVR

11. License, Funding and Other Agreements Related to the CVR

Novartis License Agreement

On March 23, 2017, resTORbio entered into an exclusive license agreement with Novartis International Pharmaceutical Ltd. (“Novartis”). Under the agreement, Novartis granted resTORbio an exclusive, field-restricted, worldwide license, to certain intellectual property rights owned or controlled by Novartis, to develop, commercialize and sell one or more therapeutic products comprising RTB101 or RTB101 in combination with everolimus in a fixed dose combination. The exclusive field under the license agreement is for the treatment, prevention and diagnosis of disease and other conditions in all indications in humans and animals.

The agreement may be terminated by either party upon a material breach of obligation by the other party that is not cured with 60 days after written notice. resTORbio may terminate the agreement in its entirety or on a product-by-product or country-by-country basis with or without cause with 60 days’ prior written notice.

Novartis may terminate the portion of the agreement related to everolimus if resTORbio fails to use commercially reasonable efforts to research, develop and commercialize a product utilizing everolimus for a period of three years. Novartis may terminate the license agreement upon resTORbio’s bankruptcy, insolvency, dissolution or winding up.

As consideration for the license, resTORbio is required to pay up to an aggregate of $4.3 million upon the satisfaction of clinical milestones, up to an aggregate of $24 million upon the satisfaction of regulatory milestones for the first indication approved, and up to an aggregate of $18 million upon the satisfaction of regulatory milestones for the second indication approved. In addition, resTORbio is required to pay up to an aggregate of $125 million upon the satisfaction of commercial milestones, based on the amount of annual net sales. resTORbio is also required to pay tiered royalties ranging from a mid-single digit percentage to a low-teen digit percentage on annual net sales of products. These royalty obligations last on a product-by-product and country-by-country basis until the latest of (i) the expiration of the last valid claim of a Novartis patent covering a subject product, (ii) the expiration of any regulatory exclusivity for the subject product in a country, or (iii) the 10^th anniversary of the first commercial sale in the country, and are subject to a reduction after the expiration of the last valid claim of a Novartis patent or the introduction of a generic equivalent of a product in a country.  As of September 30, 2020, none of the remaining clinical milestones, regulatory milestones, sales milestones, or royalties had been reached or were probable of achievement.

National Institute of Health

In May 2019, the Company was awarded a 5-year grant for up to $1.5 million from the National Institutes of Health (the “NIH”) to study RTB101 and the regulation of antiviral immunity in the elderly. The Company is entitled to use the award solely to conduct the research. The Company is solely responsible for commencing and conducting the research and will furnish periodic progress updates to the NIH throughout the term of the award. After completing the research, the Company must provide the NIH with a formal report describing the work performed and the results of the research.

For funds received under the NIH funding agreement, the Company recognizes a reduction in research and development expenses in an amount equal to the qualifying expenses incurred in each period up to the amount funded by the NIH. Qualifying expenses incurred by the Company in advance of funding by the NIH are recorded in the consolidated balance sheets as other current assets. As of September 30, 2020, $0.7 million qualifying expenses have been incurred and $0.7 million have been funded by the NIH.  

Contingent Value Rights Agreement

In connection with the Merger, the Company entered into a Contingent Value Rights Agreement (the “CVR Agreement”) with Computershare Inc. and Computershare Trust Company, N.A. as joint rights agent. Per the terms of the Merger, each holder of resTORbio common stock as of immediately prior to the completion of the Merger is entitled to one contractual contingent value right (“CVR”), subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of resTORbio common stock held by such holder as of immediately prior to the effective time of the Merger. The CVR holders are entitled to receive net proceeds from the commercialization, if any, received from a third-party commercial partner of RTB101 for a COVID-19 related indication. The total fees and expenses of the Company’s clinical trials for a COVID-19 related indication of RTB101 is limited to $3.0 million under the CVR Agreement.

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Commitments and Contingences

9 Months Ended

Sep. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. Commitments and Contingencies

Operating Leases

The Company recognizes rent expense on a straight-line basis over the lease period. Rent expense recognized under all leases was $0.2 million and $0.6 million for the three months and nine months ended September 30, 2020, respectively. Rent expense recognized under all leases was $0.2 million and $0.5 million for the three months and nine months ended September 30, 2019, respectively.

The future minimum lease payments under all non-cancelable operating lease obligations as of September 30, 2020 were as follows (in thousands):

2020 (remaining 3 months)	$	1,018
2021		4,124
2022		3,560
2023		3,428
2024		3,525
2025 and thereafter		17,371
Total	$	33,026

In conjunction with the Menlo Park lease agreement, the Company issued a cash-collateralized letter of credit in lieu of security deposit of $0.2 million. In addition, the Company issued a cash-collateralized letter of credit for $4.1 million in 2018 for the new office lease in Redwood City. The Company also maintains a letter of credit of $0.2 million for the benefit of the landlord in connection with the Company’s office lease in Boston, Massachusetts. All cash amounts are recorded as restricted cash on the condensed consolidated balance sheet as of September 30, 2020 and December 31, 2019.

Litigation

As of September 30, 2020, five of the seven lawsuits filed against the Company, its directors, Former Adicet, and/or Merger Sub in connection with the Merger had been dismissed. The Company has accrued $0.2 million as of September 30, 2020, for the resolution of claims in connection with the lawsuits. with the Merger, eight putative class action lawsuits have been filed against the Company, its directors, Former Adicet, and Merger Sub.   

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Redeemable Convertible Preferred Stock (converted to Common Stock)

9 Months Ended

Sep. 30, 2020

Temporary Equity Disclosure [Abstract]

Redeemable Convertible Preferred Stock (converted to Common Stock)

13. Redeemable Convertible Preferred Stock (converted to Common Stock)

As of December 31, 2019, redeemable convertible preferred stock consists of the following (in thousands, except per share and share amounts):

	Shares Authorized		Original Issue Price		Shares Issued and Outstanding		Carrying Value		Liquidation Preference		Common Stock Issued Upon Conversion (1)
Series A		37,104,185	$	1.20		37,104,185	$	35,960	$	44,525		4,600,920
Series A-1		629,633		1.20		629,633		447		756		78,074
Series A-2		2,428,688		1.20		2,428,688		1,749		2,914		301,157
Series B		59,200,938		1.40		57,004,415		75,927		80,000		7,068,520
		99,363,444				97,166,921	$	114,083	$	128,195		12,048,671

(1) Adjusted to reflect the Exchange Ratio.

Following the closing of the Merger, all outstanding shares of the redeemable convertible preferred stock converted into 12,048,671 shares of common stock and the related carrying value was reclassified to common stock and additional paid-in capital. There were no shares of redeemable convertible preferred stock outstanding as of September 30, 2020.

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants

9 Months Ended

Sep. 30, 2020

Liabilities And Stockholders Equity [Abstract]

Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants

14. Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants

In connection with Series B redeemable convertible preferred stock financing transactions, we issued to our financial advisor warrants to purchase 1,781,387 shares of our Series B redeemable convertible preferred stock at an exercise price of at $1.4034 per share. These warrants will terminate at the earlier of seven-year anniversary from the issuance date and a liquidation of the company. Additionally, in connection with the entrance into the Loan Agreement, the Company issued Pacific Western Bank a warrant to purchase shares of its Series B redeemable convertible preferred stock (see Note 9). These warrants together are referred to as Series B Warrants.

Prior to the Merger, the Company classified the Series B Warrants as a liability on its consolidated balance sheet because the warrants are freestanding financial instruments that may have required the Company to transfer assets upon exercise. The liability associated with each of these warrants was initially recorded at fair value upon the issuance date of each warrant and was subsequently remeasured to fair value as a component of other income (expense), net in the consolidated statement of operations and comprehensive loss. Upon the closing of the Merger (see Note 3), pursuant to the Merger Agreement, all of the outstanding redeemable convertible preferred stock was converted to shares of the Company’s common stock and the Series B Warrants converted to warrants for the purchase of the shares of the Company’s common stock. The Company assessed the features of the warrants and determined that they qualify for classification as permanent equity upon the closing of the Merger. Accordingly, the Company remeasured the warrants to fair value upon the closing of the Merger, which was $2.9 million on September 15, 2020. Upon the closing of the Merger, the warrant liability was reclassified to additional paid-in capital. The fair value of the warrants to purchase shares of the Company’s common stock was equal to the fair value of the Series B Warrants on the Merger date. Accordingly, no incremental expense was recognized at the Merger date.

The Series B Warrants had a fair value of $1.9 million as of December 31, 2019. The change in fair value of $0.9 million and $0.8 during the three and nine months ended September 30, 2020, respectively, was recorded as a component of other income (expense), net in the condensed consolidated statements of operations and comprehensive loss. The change in fair value of $0.1 million and $0.1 during the three and nine months ended September 30, 2019, respectively, was recorded as a component of other income (expense), net in the condensed consolidated statements of operations and comprehensive loss.

The redeemable convertible preferred stock warrant liability was valued using the following assumptions under the Black-Scholes option-pricing model:

	September 14, 2020 (Conversion Date)			April 28, 2020 (Issuance Date)			December 31, 2019
Stock price	$	16.59		$	11.61		$	11.32
Expected term (years)	5.86 - 6.62				7.00		6.57 - 6.74
Expected volatility	81.1% - 82.1%				91.17	%	82.1% - 93.3%
Risk-free interest rate	0.35% - 0.42%				0.52	%	1.80% - 1.81%
Dividend yield		0	%		0	%		0	%

The following table provides a roll forward of outstanding warrants:

	Number of warrants			Weighted Average Exercise Price		Weighted Average Contractual Term (Years)
Outstanding and exercisable warrants to    purchase preferred shares as of    December 31, 2019		1,781,387		$	1.4034		6.64
Issued		128,260
Converted to warrants for the purchase of    common stock and adjusted for the Exchange    Ratio and Reverse Stock Split		(1,672,854	)
Outstanding and exercisable warrants to purchase common stock as of September    30, 2020		236,793		$	11.3177		5.94

As of September 30, 2020, the Company’s outstanding warrants to purchase shares of common stock, including the New PacWest Warrant, consisted of the following:

Issuance Date	Number of Shares of Common Stock Issuable		Exercise Price		Classification	Expiration Date
September 15, 2020		101,610	$	11.3177	Equity	July 25, 2026
September 15, 2020		30,924	$	11.3177	Equity	August 21, 2026
September 15, 2020		77,312	$	11.3177	Equity	September 19, 2026
September 15, 2020		11,044	$	11.3177	Equity	September 26, 2026
September 15, 2020		15,903	$	11.3177	Equity	April 28, 2027
		236,793

As of December 31, 2019, the Company’s outstanding warrants to purchase shares of redeemable convertible preferred stock (which converted into warrants to purchase common stock upon close of the Merger) consisted of the following (not adjusted for the Exchange Ratio):

Warrant Name	Issuance Date	Number of Shares of Preferred Stock Issuable		Exercise Price		Exercisable for	Classification	Expiration Date
Series B warrants	July 25, 2019		819,438	$	1.4034	Series B	Liability	July 25, 2026
Series B warrants	August 21, 2019		249,394	$	1.4034	Series B	Liability	August 21, 2026
Series B warrants	September 19, 2019		623,486	$	1.4034	Series B	Liability	September 19, 2026
Series B warrants	September 26, 2019		89,069	$	1.4034	Series B	Liability	September 26, 2026
			1,781,387

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

15. Stock-based Compensation

The Company had reserved common stock for future issuance as follows:

	September 30, 2020		December 31, 2019
Conversion of redeemable convertible preferred stock (as converted to    common stock)		—		12,048,671
Conversion of additional authorized and unissued redeemable    convertible preferred stock		—		51,506
Stock options available for future grant		2,098,174		653,136
Stock options issued and outstanding		3,269,399		1,860,646
Redeemable convertible preferred stock warrants issued and outstanding		—		220,890
Common stock warrants issued and outstanding		226,191		—
Total		5,593,764		14,834,849

A summary of stock option activity for the nine months ended September 30, 2020 is set forth below:

	Ongoing Awards
	Number of Shares Available for Grant			Number of Shares Underlying Outstanding Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2019		653,136			1,860,646		$	4.05		8.53	$	5,812
Assumed as part of the Merger		2,707,144			81,370		$	8.39
Options granted		(1,517,446	)		1,713,344		$	16.06
Options exercised		—			(123,141	)	$	1.57
Options forfeited or cancelled		255,340			(262,820	)	$	4.80
Outstanding, September 30, 2020		2,098,174			3,269,399		$	10.49		7.73		11,780
Shares exercisable, September 30, 2020					1,195,101		$	4.20		4.95		9,246
Vested and expected to vest, September 30, 2020					3,269,399		$	10.49		7.73		11,780

Total stock-based compensation expense recognized was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Research and development	$	951	$	54	$	1,125	$	191
General and administrative		2,015		337		2,491		674
Total stock-based compensation	$	2,966	$	391	$	3,616	$	865

Summary of Plans

Upon completion of the Merger with resTORbio on September 15, 2020, Former Adicet’s 2014 Share Option Plan (the “2014 Plan”), Former Adicet’s 2015 Stock Incentive Plan (the “2015 Plan”), resTORbio’s 2017 Stock Incentive Plan (the “2017 Plan”), resTORbio’s 2018 Stock Incentive Plan (the “2018 Plan”) and resTORbio’s 2018 Employee Stock Purchase Plan (the “2018 ESPP”, and, collectively with the 2014 Plan, the 2015 Plan, the 2017 Plan and the 2018 Plan, the “Plans”) were assumed by the Company. The Plans are administered by the Board of Directors or, at the discretion of the Board of Directors, by a committee of the Board of Directors. No further shares will be issued from the 2014 Plan or 2017 Plan. The exercise prices, vesting and other restrictions are determined at the discretion of the Board of Directors, or its committee if so delegated, except that the exercise price per share of stock options may not be less than 100% of the fair market value of the share of common stock on the date of grant and the term of the stock option may not be greater than ten years. Incentive stock options granted to employees and restricted stock awards granted to employees, officers, members of the Board of Directors, advisors, and consultants of the Company typically vest over four years. Non-statutory options granted to employees, officers, members of the Board of Directors, advisors, and consultants of the Company typically vest over three or four years. Shares that are expired, terminated, surrendered or canceled under the Plans without having been fully exercised will be available for future awards. In addition, shares of common stock that are tendered to the Company by a participant to exercise an award are added to the number of shares of common stock available for the grant of awards.

The 2017 Plan and 2018 Plan

In 2017, resTORbio adopted the 2017 Plan. In connection with resTORbio’s initial public offering completed in January 2018, the resTORbio Board adopted and resTORbio’s stockholders approved the 2018 Plan. The 2018 Plan provides that the number of shares reserved and available for issuance under the plan will automatically increase each January 1, beginning on January 1, 2019, by 4% of the outstanding number of shares of resTORbio’s common stock on the immediately preceding December 31 or such lesser number of shares as determined by the Board.

Since the date of effectiveness of the 2018 Plan, resTORbio has not and will not grant any further awards under the 2017 Plan. However, any shares of common stock subject to awards under the 2017 Plan that expire, terminate, or otherwise are surrendered, canceled, forfeited or repurchased without having been fully exercised or resulting in any common stock being issued will become available for issuance under the 2018 Plan.

As of September 30, 2020, the number of shares of common stock available for grant under the 2017 and 2018 Plan is 1,462,006. As of September 30, 2020, an aggregate of 1,326,508 shares of common stock were issuable upon the exercise of outstanding stock options under the 2017 Plan and 2018 Plans at a weighted average exercise price of $15.64 per share.

The 2014 Plan and 2015 Plan

At the effective time of the Merger, each outstanding and unexercised option to purchase Former Adicet’s common stock, whether vested or unvested, pursuant to the 2015 Plan  and a subset of options issued pursuant to the 2014 Plan were converted into options to purchase a number of shares of the Company’s common stock based on the Exchange Ratio. Former Adicet warrants with rights to acquire Former Adicet capital stock were converted into rights to acquire a certain number of shares of the Company’s common stock based on the Exchange Ratio, subject to the terms of and adjustments in the merger agreement.

As of September 30, 2020, the number of shares of common stock available for grant under the 2017 and 2018 Plan is 636,168. As of September 30, 2020, an aggregate of 1,677,979 shares of Former Adicet common stock were issuable upon the exercise of outstanding stock options under the 2015 plan at a weighted average exercise price of $6.14 per share and an aggregate of 69,014 shares of Former Adicet common stock were issuable upon the exercise of outstanding stock options under the 2014 Plan at a weighted average exercise price of $1.27 per share.

Since the date of effectiveness of the Merger, the Company has not and will not grant any further awards under the 2014 Plan.

2018 Employee Stock Purchase Plan

The resTORbio Board adopted and resTORbio’s stockholders approved the 2018 ESPP, which became effective on the date immediately preceding the date on which resTORbio’s registration statement of Form S-1 became effective. The

2018 ESPP enables eligible employees to purchase shares of resTORbio’s common stock at a discount. The number of shares of common stock originally reserved for issuance under the 2018 ESPP were 39,290 shares. The 2018 ESPP provides that the number of shares reserved and available for issuance will automatically increase each January 1, beginning on January 1, 2019 and increasing each January 1 thereafter through January 1, 2028, by the least of (i) 1% of the outstanding number of shares of resTORbio’s common stock on the immediately preceding December 31; (ii) 77,703 shares or (iii) such number of shares as determined by the ESPP administrator. On January 1, 2019, as a result of the foregoing evergreen provision, the number of shares of common stock available for issuance under the 2018 ESPP automatically increased from 39,290 to 79,369 shares. On January 1, 2020, as a result of the foregoing evergreen provision, the number of shares of common stock available for issuance under the 2018 ESPP automatically increased from 79,369 to 131,432 shares. No shares have been issued under the 2018 ESPP during the three and six months ended June 30, 2020.

Inducement Grant

As of September 30, 2020, an aggregate of 195,898 shares of were issuable upon the exercise of inducement grants of stock options approved by the Company in accordance with Nasdaq listing Rule 5635(c)(4) at a weighted average exercise price of $16.11 per share.

Former CEO’s Stock Option Modification

In connection with the Merger, the stock options granted to Dr. Singhal were modified (refer to Note 3 for details), which resulted in acceleration and recognition of the stock compensation expense of $0.6 million during the quarter ended September 30, 2020. The modification also resulted in incremental stock compensation expense of $0.1 million that will be recognized through May 7, 2021 as the Company determined that Dr. Singhal will be providing substantial services under the Independent Contractor Agreement with Dr. Singhal through that date.

Former CEO’s Performance Option

On July 14, 2020, the Company’s Board of Directors confirmed that the conditions for Dr. Singhal’s Second Target Milestone Option (as defined in Dr. Singhal’s employment agreement with the Company) had been fulfilled as the Company achieved the milestone for the selection of a clinical candidate to the second collaboration target under the Regeneron Agreement. Following the Merger, on September 17, 2020, the Company’s Board of Directors granted an option to purchase 16,931 shares of the Company’s common stock at an exercise price of $16.11 per share, (i) one-third of the shares vesting on the first anniversary of May 6, 2019, (ii) one-third of the shares vesting in 12 equal monthly installments following such first anniversary, and (iii) one-third of the shares vesting in accordance with the terms of his Transition Agreement. The Company recognized $0.1 million in stock compensation expense associated with this reward during the three months ended September 30, 2020.

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Net Loss Per Share

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net Loss per Share

16. Net Loss per Share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders, which excludes unvested restricted shares and shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Net loss attributable to common stockholders	$	(14,779	)	$	(14,778	)	$	(27,720	)	$	(21,560	)
Weighted-average shares used in computing net loss    per share attributable to common shareholders,    basic and diluted		5,208,887			2,149,986			3,190,557			2,133,645
Net loss per share attributable to common stockholder,    basic and diluted	$	(2.84	)	$	(6.87	)	$	(8.69	)	$	(10.10	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the period presented because including them would have been antidilutive:

	As of September 30,
	2020		2019
Redeemable convertible preferred stock (as converted to common stock)		—		12,048,671
Options to purchase common stock		3,269,399		1,319,600
Redeemable convertible preferred stock warrants		—		220,890
Common stock warrants		226,191		—
Total		3,495,590		13,589,161

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Income Taxes

9 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Income Taxes

17. Income Taxes

The Company recorded an income tax benefit of $2.7 million during the nine months ended September 30, 2020.

The income tax benefit during the nine months ended September 30, 2020 was generated as a result of the recognition of net operating loss carryback under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) which was enacted on March 27, 2020 in response to the COVID-19 pandemic and generates a refund of income taxes paid for the year ended December 31, 2017. The Company records the effect of an enacted change in a tax law in the period that includes the enactment date in accordance with ASC 740, Income Taxes.

The tax relief measures under the CARES Act for businesses include a five-year net operating loss carryback, suspension of annual deduction limitation of 80% of taxable income from net operating losses generated in a tax year beginning after December 31, 2017, changes in the deductibility of interest, acceleration of alternative minimum tax credit refunds, payroll tax relief, and a technical correction to allow accelerated deductions for qualified improvement property.

The Company maintains a full valuation allowance against its deferred tax assets other than a deferred tax liability arising from merger with resTORbio due to the Company’s history of losses as of September 30, 2020.  The deferred tax liability recorded relates to the basis difference associated with IPR&D.

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Related Party Transactions

9 Months Ended

Sep. 30, 2020

Related Party Transactions [Abstract]

Related Party Transactions

18. Related Party

As of September 30, 2020, and December 31, 2019, Regeneron owned 883,568 shares of the Company’s common stock, respectively. Regeneron became a related party in July 2019 as a result of Series B redeemable convertible preferred stock financing. For the three and nine months ended September 30, 2020 and 2019, the Company recorded revenue of $3.0 million, $12.5 million, $(7.0) million and $(1.0) million, respectively, and as of September 30, 2020, the Company recorded accounts receivable of $0 and deferred revenue of $19.4 million related to the Regeneron Agreement. See Note 10 for a discussion of the Regeneron Agreement.

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Subsequent Event

9 Months Ended

Sep. 30, 2020

Subsequent Events [Abstract]

Subsequent Event

19. Subsequent Events

On October 22, 2020, the U.S. Food and Drug Administration cleared the Company’s Investigational New Drug (“IND”) application for ADI-001, an allogeneic gamma delta T cell therapy expressing a chimeric antigen receptor (“CAR”) targeting CD20 for treatment of non-Hodgkin’s lymphoma (“NHL”). The active IND enables the Company to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The unaudited interim condensed consolidated financial statements and related disclosures have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Principles of Consolidation

Principles of Consolidation

The interim condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The U.S. dollar is the functional and reporting currency of the Company and its subsidiaries.

Reverse Stock Split

Reverse Stock Split

On September 15, 2020, immediately before the closing of the Merger, resTORbio effected a 1-for-7 reverse stock split of resTORbio’s common stock. Accordingly, all share and per share amounts for all periods presented in the accompanying condensed consolidated financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split. No fractional shares were issued in connection with the Reverse Stock Split. Unless otherwise noted, all references to common stock share and per share amounts have also been adjusted to reflect the exchange ratio of 0.1240.

Unaudited Interim Financial Information

Unaudited Interim Financial Information

The condensed consolidated balance sheet as of December 31, 2019 was derived from the Company’s audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of September 30, 2020 and for the three and nine months ended September 30, 2020 and 2019, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2019 included in the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 16, 2020. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of September 30, 2020 and condensed consolidated results of operations for the three and nine months ended September 30, 2020 and 2019 and condensed consolidated cash flows for the nine months ended September 30, 2020 and 2019 have been made. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2020.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements as well as the reported amounts of revenues and expenses during the reporting period. Such estimates include the valuation of the intangible assets acquired in business combinations, redeemable convertible preferred stock warrant liability, redeemable convertible preferred stock tranche liability, the Technion Research and Development Foundation liability (“TRDF Liability”), contingent consideration liability for contingent value right (“CVR”), deferred tax assets, useful lives of property and equipment, accruals for research and development activities, revenue recognition and stock-based compensation. Actual results could differ from those estimates. The current COVID-19 (coronavirus) pandemic, which is impacting worldwide economic activity, poses risk that the Company or its employees, contractors, suppliers, and other partners may be prevented from conducting business activities for an indefinite period of time, including due to shutdowns that may be requested or mandated by governmental authorities. The extent to which the coronavirus impacts the Company’s operations will depend on future developments, which are highly uncertain and cannot be predicted with confidence, including the duration of the outbreak, new information that will emerge concerning the severity of the coronavirus and the actions to contain the coronavirus or treat its impact, among others. COVID-19 may impact the timing of regulatory approval of the INDs for clinical trials, the enrollment of any clinical trials that are approved, the availability of clinical trial materials and regulatory approval and commercialization of our products. COVID-19 may also impact the Company’s ability to access capital, which could negatively impact short-term and long-term liquidity.

Business Combinations

Business Combinations

Business combinations are accounted for under the acquisition method. The Company recognizes the assets acquired and liabilities assumed in business combinations on the basis of their fair values at the date of acquisition. The Company assesses the fair value of assets acquired, including intangible assets, and liabilities assumed using a variety of methods. Each asset acquired and liability assumed is measured at fair value from the perspective of a market participant. The method used to estimate the fair values of intangible assets incorporates significant estimates and assumptions regarding the estimates a market participant would make in order to evaluate an asset, including a market participant’s use of the asset, future cash inflows and outflows, probabilities of success, asset lives, and the appropriate discount rates. Acquired in-process research and development (“IPR&D”) is recognized at fair value and initially characterized as an indefinite-lived intangible asset, irrespective of whether the acquired IPR&D has an alternative future use. Any excess purchase price over the fair value of the net tangible and intangible assets acquired is allocated to goodwill. Transaction costs and restructuring costs associated with a business combination are expensed as incurred.

During the measurement period, which extends no later than one year from the acquisition date, the Company may record certain adjustments to the carrying value of the assets acquired and liabilities assumed with the corresponding offset to goodwill. After the measurement period, all adjustments are recorded in the condensed consolidated statements of operations as operating expenses or income.

Contingent Consideration Liability

Contingent Consideration Liability

The estimated fair value of contingent consideration liability, initially measured and recorded on the acquisition date, is considered to be a Level 3 instrument. The contingent consideration liability is recorded at fair value at the end of each reporting period with changes in estimated fair values recorded in research and development expenses in the condensed consolidated statements of operations.

Goodwill

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net tangible and identified intangible assets acquired in a business combination. Goodwill is not amortized but is evaluated at least annually for impairment or when a change in facts and circumstances indicate that the fair value of the goodwill may be below its carrying value.

Goodwill is tested for impairment at the reporting unit level annually in the fourth quarter, or more frequently when events or changes in circumstances indicate that the asset might be impaired. Examples of such events or circumstances include, but are not limited to, a significant adverse change in legal or business climate, an adverse regulatory action or unanticipated competition. The Company has determined that it operates in a single operating segment and has a single reporting unit.

Prior to performing the impairment test, the Company assesses qualitative factors to determine whether the existence of events or circumstances would indicate that it is more likely than not that the fair value of the reporting unit was less than its carrying amount. If after assessing the totality of events or circumstances, the Company were to determine that it is more likely than not that the fair value of the reporting unit is less than its carrying amount, then the Company would perform a quantitative impairment test.

The quantitative impairment test involves comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets, goodwill is not impaired, and no further testing is required. If the fair value of the reporting unit is less than the carrying value, the Company measures the amount of impairment loss, if any, as the excess of the carrying value over the fair value of the reporting unit. The Company has determined there were no indicators of goodwill impairment as of September 30, 2020.

Intangible Assets

Intangible Assets

In connection with the Merger, the Company acquired certain IPR&D assets, which were classified as indefinite-lived intangible assets. Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires and have not been completed at the acquisition date. The fair value of IPR&D acquired in a business combination is recorded on the Company’s condensed consolidated balance sheets at the acquisition-date fair value and is determined by estimating the costs to develop the technology into commercially viable products, estimating the resulting revenue from the products, and discounting the projected net cash flows to present value. IPR&D is not amortized, but rather is reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned, or transferred to a third party.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the FASB ASC or other standard setting bodies and adopted by the Company as of the specified effective date, unless otherwise discussed below.

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. The new disclosure requirements include disclosure related to changes in unrealized gains or losses included in other comprehensive income (loss) for recurring Level 3 fair value measurements held at the end of each reporting period and the explicit requirement to disclose the range and weighted-average of significant unobservable inputs used for Level 3 fair value measurements. This ASU removes the requirement to disclose: the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. For all entities, this ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company adopted this ASU effective January 1, 2020. The adoption of this ASU did not have a material effect on the Company’s condensed consolidated financial statements and related disclosures.

Recently Issued Accounting Pronouncements

In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) (“ASU 2020-04”). The amendments in ASU 2020-04 provide optional expedients and exceptions for applying generally accepted accounting principles to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2022. An entity may elect to apply the amendments for contract modifications by Topic or Industry Subtopic as of any date from the beginning an interim period that includes or is subsequent to March 12, 2020, or prospectively from the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic, the amendments must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. The Company may elect to apply ASU 2020-04 as its contracts referenced in London Interbank Offered Rate (“LIBOR”) are impacted by reference rate reform. The Company is currently evaluating the impact of the adoption of this ASU on the Company’s consolidated financial statements.

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Business Combination (Tables)

9 Months Ended

Sep. 30, 2020

Business Combinations [Abstract]

Schedule of Summarizes the Purchase Price in the Merger

The following summarizes the purchase price in the Merger (in thousands, except share and per share amounts):

Fair value of common stock shares of the combined company    owned by resTORbio stockholders (1)	$	83,516
Fair value of contingent consideration liability with respect to CVR (2)		2,880
Estimated fair value of modified stock options and    restricted stock units attributable to pre-combination services (3)		626
Purchase price	$	87,022

Schedule of Estimated Share Consideration of Combined Company

(1) Represents the share consideration of the combined company that the resTORbio stockholders own as of the closing of the merger calculated as follows:

Number of shares of the combined company owned by resTORbio    stockholders (a)		5,207,695
Multiplied by the fair value per share of resTORbio common    stock (b)	$	16.59
Acquisition date fair value of resTORbio		86,396
Less: portion of the fair value to be distributed as CVR (c)		(2,880	)
Fair value of shares of the combined company  owned by resTORbio    stockholders	$	83,516

Schedule of Summarizes the Allocation of the Purchase Price to the Net Tangible and Intangible Assets Acquired

The following summarizes the allocation of the purchase price to the net tangible and intangible assets acquired (in thousands):

Net assets acquired:
Cash and cash equivalents	$	63,869
Prepaid expenses and other current assets		2,505
Property and equipment		318
IPR&D		3,490
Restricted cash		245
Accounts payable		(1,316	)
Accrued and other current liabilities		(2,421	)
Other liabilities		(40	)
Deferred tax liability		(367	)
Goodwill		20,739
Purchase price	$	87,022

Schedule of Supplemental Unaudited Pro Forma Information

The following supplemental unaudited pro forma information represents the Company’s financial results as if the acquisition of resTORbio had occurred on January 1, 2019 (in thousands).

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Revenue	$	3,028		$	(7,047	)	$	12,493		$	(974	)
Net loss	$	(9,791	)	$	(53,794	)	$	(26,424	)	$	(100,142	)

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured on Recurring Basis

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	September 30, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	10	$	—	$	—	$	10
Cash equivalents(1)		10		—		—		10
Asset-backed securities		—		14,689		—		14,689
Corporate debt securities		—		5,722		—		5,722
Commercial paper		—		2,749		—		2,749
Marketable debt securities		—		23,160		—		23,160
Total fair value of assets	$	10	$	23,160	$	—	$	23,170
Liabilities:
Contingent consideration	$	—	$	—	$	2,880		2,880
Total fair value of liabilities	$	—	$	—	$	2,880	$	2,880

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	7,232	$	—	$	—	$	7,232
Cash equivalents(1)		7,232		—		—		7,232
Asset-backed securities		—		19,598		—		19,598
Corporate debt securities		—		19,394		—		19,394
Commercial paper		—		17,892		—		17,892
U.S. Government agency bonds		—		5,497		—		5,497
Marketable debt securities		—		62,381		—		62,381
Total fair value of assets	$	7,232	$	62,381	$	—	$	69,613
Liabilities:
Redeemable convertible preferred stock warrant    liability	$	—	$	—	$	1,881		1,881
Total fair value of liabilities	$	—	$	—	$	1,881	$	1,881

(1) Included in cash and cash equivalents in the condensed consolidated balance sheets

Schedule of Changes in Fair Value of Level 3 Financial Instruments

The following tables presents a summary of the changes in the fair value of the Company’s Level 3 financial instruments (in thousands):

	Redeemable Convertible Preferred Stock Tranche Liability			TRDF Liability			Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2018	$	3,113		$	142		$	—
Recognition of preferred stock warrant liabilities		—			—			2,131
Change in the fair value included in other income, net		(1,970	)		(54	)		(62	)
Settlement		—			(88	)		—
Termination		(1,143	)		—			—
Fair value as of September 30, 2019	$	—		$	—		$	2,069

	Redeemable Convertible Preferred Stock Warrant Liability
Fair value as of December 31, 2019	$	1,881
Recognition of preferred stock warrant liability		144
Change in the fair value included in other income, net		897
Conversion of convertible preferred stock warrant into common stock warrant    in connection with Merger		(2,922	)
Fair value as of September 30, 2020	$	—

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Marketable Debt Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Debt Securities

The following table summarizes the Company’s marketable debt securities (in thousands):

	September 30, 2020
	Amortized Cost		Unrealized Losses		Unrealized Gains		Fair Value
Asset-backed securities	$	14,639	$	—	$	50	$	14,689
Corporate debt securities		5,700		—		22		5,722
Commercial paper		2,738		—		11		2,749
Total	$	23,077	$	—	$	83	$	23,160

	December 31, 2019
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Asset-backed securities	$	19,589	$	(1	)	$	10	$	19,598
Corporate debt securities		19,387		(3	)		9		19,393
Commercial paper		17,882		—			11		17,893
U.S. Government agency bonds		5,500		(3	)		—		5,497
Total	$	62,358	$	(7	)	$	30	$	62,381

Summary of Classification of Marketable Debt Securities in Condensed Consolidated Balance Sheets

The following table summarizes the classification of the Company’s marketable debt securities in the condensed consolidated balance sheets (in thousands):

	September 30,		December 31,
	2020		2019
Short-term marketable debt securities		23,160		51,793
Long-term marketable debt securities		—		10,588
Total	$	23,160	$	62,381

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Prepaid Expenses and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2020

Prepaid Expense And Other Assets Current [Abstract]

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Prepaid expenses	$	2,416	$	615
Prepaid insurance		3,353		57
Tax receivable		3,400		722
Interest receivable		67		213
Other current assets		55		179
Total prepaid expenses and other current assets	$	9,291	$	1,786

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Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2020

Property Plant And Equipment [Abstract]

Summary of Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	Useful life (in years)		September 30, 2020			December 31, 2019
Laboratory equipment	3		$	4,305		$	3,872
Leasehold improvements	Lesser of useful life or lease term		$	1,406		$	1,327
Furniture and fixtures	3			526			68
Construction in progress		—		94			300
Computer equipment	3			91			42
Software	3			170			150
				6,592			5,759
Less: Accumulated depreciation and amortization				(4,549	)		(3,638	)
Property and equipment, net			$	2,043		$	2,121

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Accrued and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Payables And Accruals [Abstract]

Summary of Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following (in thousands):

	September 30, 2020		December 31, 2019
Accrued compensation	$	4,455	$	1,359
Accrued research and development expenses		552		450
Accrued professional services		1,016		301
Accrued other liabilities		826		710
Total accrued and other liabilities	$	6,849	$	2,820

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Regeneron License and Collaboration Arrangement (Tables)

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Change in Company's Contract Liabilities

The following tables present changes in the Company’s contract liabilities for the three and nine months ended September 30, 2020 and 2019 (in thousands):

Nine Months Ended September 30, 2020	Balance at beginning of period		Additions		Additions (Deductions) (1)			Balance at end of period
Contract asset	$	—	$	10,000	$	(10,000	)	$	—
Contract liability	$	21,883	$	10,000	$	(12,493	)	$	19,390

Nine Months Ended September 30, 2019	Balance at beginning of period		Additions		Additions (Deductions) (1)		Balance at end of period
Contract liability	$	22,878	$	—	$	974	$	23,852

⁽¹⁾ Additions (deductions) to contract liabilities relate to deferred revenue derecognized (recognized) as revenue during the reporting period.

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Commitments and Contingences (Tables)

9 Months Ended

Sep. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Schedule Of Future Minimum Rental Payments For Operating Leases

The future minimum lease payments under all non-cancelable operating lease obligations as of September 30, 2020 were as follows (in thousands):

2020 (remaining 3 months)	$	1,018
2021		4,124
2022		3,560
2023		3,428
2024		3,525
2025 and thereafter		17,371
Total	$	33,026

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Redeemable Convertible Preferred Stock (converted to Common Stock) (Tables)

9 Months Ended

Sep. 30, 2020

Temporary Equity Disclosure [Abstract]

Summary of Redeemable Convertible Preferred Stock

As of December 31, 2019, redeemable convertible preferred stock consists of the following (in thousands, except per share and share amounts):

	Shares Authorized		Original Issue Price		Shares Issued and Outstanding		Carrying Value		Liquidation Preference		Common Stock Issued Upon Conversion (1)
Series A		37,104,185	$	1.20		37,104,185	$	35,960	$	44,525		4,600,920
Series A-1		629,633		1.20		629,633		447		756		78,074
Series A-2		2,428,688		1.20		2,428,688		1,749		2,914		301,157
Series B		59,200,938		1.40		57,004,415		75,927		80,000		7,068,520
		99,363,444				97,166,921	$	114,083	$	128,195		12,048,671

(1) Adjusted to reflect the Exchange Ratio.

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants (Tables)

9 Months Ended

Sep. 30, 2020

Liabilities And Stockholders Equity [Abstract]

Schedule of Redeemable Convertible Preferred Stock Warrant Liability using Black-Scholes Option-Pricing Model

The redeemable convertible preferred stock warrant liability was valued using the following assumptions under the Black-Scholes option-pricing model:

	September 14, 2020 (Conversion Date)			April 28, 2020 (Issuance Date)			December 31, 2019
Stock price	$	16.59		$	11.61		$	11.32
Expected term (years)	5.86 - 6.62				7.00		6.57 - 6.74
Expected volatility	81.1% - 82.1%				91.17	%	82.1% - 93.3%
Risk-free interest rate	0.35% - 0.42%				0.52	%	1.80% - 1.81%
Dividend yield		0	%		0	%		0	%

Schedule of Outstanding Warrants

The following table provides a roll forward of outstanding warrants:

	Number of warrants			Weighted Average Exercise Price		Weighted Average Contractual Term (Years)
Outstanding and exercisable warrants to    purchase preferred shares as of    December 31, 2019		1,781,387		$	1.4034		6.64
Issued		128,260
Converted to warrants for the purchase of    common stock and adjusted for the Exchange    Ratio and Reverse Stock Split		(1,672,854	)
Outstanding and exercisable warrants to purchase common stock as of September    30, 2020		236,793		$	11.3177		5.94

Schedule of Outstanding Warrants to Purchase Shares of Common Stock

As of September 30, 2020, the Company’s outstanding warrants to purchase shares of common stock, including the New PacWest Warrant, consisted of the following:

Issuance Date	Number of Shares of Common Stock Issuable		Exercise Price		Classification	Expiration Date
September 15, 2020		101,610	$	11.3177	Equity	July 25, 2026
September 15, 2020		30,924	$	11.3177	Equity	August 21, 2026
September 15, 2020		77,312	$	11.3177	Equity	September 19, 2026
September 15, 2020		11,044	$	11.3177	Equity	September 26, 2026
September 15, 2020		15,903	$	11.3177	Equity	April 28, 2027
		236,793

Schedule of Outstanding Warrants to Purchase Shares of Redeemable Convertible Preferred Stock

As of December 31, 2019, the Company’s outstanding warrants to purchase shares of redeemable convertible preferred stock (which converted into warrants to purchase common stock upon close of the Merger) consisted of the following (not adjusted for the Exchange Ratio):

Warrant Name	Issuance Date	Number of Shares of Preferred Stock Issuable		Exercise Price		Exercisable for	Classification	Expiration Date
Series B warrants	July 25, 2019		819,438	$	1.4034	Series B	Liability	July 25, 2026
Series B warrants	August 21, 2019		249,394	$	1.4034	Series B	Liability	August 21, 2026
Series B warrants	September 19, 2019		623,486	$	1.4034	Series B	Liability	September 19, 2026
Series B warrants	September 26, 2019		89,069	$	1.4034	Series B	Liability	September 26, 2026
			1,781,387

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Number of Shares of Common Stock Reserved for Future Issuance

The Company had reserved common stock for future issuance as follows:

	September 30, 2020		December 31, 2019
Conversion of redeemable convertible preferred stock (as converted to    common stock)		—		12,048,671
Conversion of additional authorized and unissued redeemable    convertible preferred stock		—		51,506
Stock options available for future grant		2,098,174		653,136
Stock options issued and outstanding		3,269,399		1,860,646
Redeemable convertible preferred stock warrants issued and outstanding		—		220,890
Common stock warrants issued and outstanding		226,191		—
Total		5,593,764		14,834,849

Summary of Stock Option Activity

A summary of stock option activity for the nine months ended September 30, 2020 is set forth below:

	Ongoing Awards
	Number of Shares Available for Grant			Number of Shares Underlying Outstanding Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2019		653,136			1,860,646		$	4.05		8.53	$	5,812
Assumed as part of the Merger		2,707,144			81,370		$	8.39
Options granted		(1,517,446	)		1,713,344		$	16.06
Options exercised		—			(123,141	)	$	1.57
Options forfeited or cancelled		255,340			(262,820	)	$	4.80
Outstanding, September 30, 2020		2,098,174			3,269,399		$	10.49		7.73		11,780
Shares exercisable, September 30, 2020					1,195,101		$	4.20		4.95		9,246
Vested and expected to vest, September 30, 2020					3,269,399		$	10.49		7.73		11,780

Summary of Stock-Based Compensation Expense

Total stock-based compensation expense recognized was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Research and development	$	951	$	54	$	1,125	$	191
General and administrative		2,015		337		2,491		674
Total stock-based compensation	$	2,966	$	391	$	3,616	$	865

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Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders, which excludes unvested restricted shares and shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Net loss attributable to common stockholders	$	(14,779	)	$	(14,778	)	$	(27,720	)	$	(21,560	)
Weighted-average shares used in computing net loss    per share attributable to common shareholders,    basic and diluted		5,208,887			2,149,986			3,190,557			2,133,645
Net loss per share attributable to common stockholder,    basic and diluted	$	(2.84	)	$	(6.87	)	$	(8.69	)	$	(10.10	)

Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the period presented because including them would have been antidilutive:

	As of September 30,
	2020		2019
Redeemable convertible preferred stock (as converted to common stock)		—		12,048,671
Options to purchase common stock		3,269,399		1,319,600
Redeemable convertible preferred stock warrants		—		220,890
Common stock warrants		226,191		—
Total		3,495,590		13,589,161

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Organization and Nature of the Business - Additional Information (Details) $ in Thousands			9 Months Ended
	Sep. 15, 2020	Sep. 15, 2020	Sep. 30, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Schedule Of Equity Method Investments [Line Items]
Entity incorporation date			Nov. 30, 2014
Entity date of merger			Apr. 28, 2020
Equity method investment, Ownership percentage			25.00%
Reverse stock split	1-for-7	1-for-7
Exchange ratio	0.1240
Common stock, shares outstanding | shares			19,589,637	2,155,578
Accumulated deficit			$ (97,367)	$ (69,647)
Adicet Therapeutics [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, Ownership percentage			75.00%
Common stock, shares outstanding | shares			19,589,828
Cash, cash equivalents and marketable securities			$ 108,100
Accumulated deficit			$ 97,400

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Summary of Significant Accounting Policies - Additional Information (Details)			9 Months Ended
	Sep. 15, 2020 shares	Sep. 15, 2020	Sep. 30, 2020 USD ($)
Accounting Policies [Abstract]
Reverse stock split	1-for-7	1-for-7
Fractional shares for reverse stock split ratio | shares	0
Reverse stock split exchange ratio	0.1240
Goodwill impairment | $			$ 0

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Business Combination - Additional Information (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 15, 2020 shares	Sep. 15, 2020 shares	Apr. 28, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Reverse stock split exchange ratio		0.1240
Percentage of outstanding capital stock	75.00%	75.00%
Reverse stock split	1-for-7	1-for-7
Goodwill				$ 20,739		$ 20,739
Transition Agreement [Member]
Business Acquisition [Line Items]
Amount equal to pro-rated bonus			$ 212,000
Lump sum payable			250,000
Payable upon closing of merger			24,000
Legal fees			15,000
Advisory services annual fee			12,500
resTORbio
Business Acquisition [Line Items]
Reverse stock split exchange ratio		0.1240
Number of shares of surviving stock options | shares		81,370
Unvested restricted stock units outstanding | shares	91,309	91,309
Common stock share issued on a net settlement basis | shares		55,854
Goodwill				20,739		20,739
Transaction cost for merger				2,100		7,100
Transaction cost for business acquisition				$ 8,600	$ 8,600	$ 15,600	$ 15,600
resTORbio | Transition Agreement [Member]
Business Acquisition [Line Items]
Cash payment			$ 470,000
Expiration period closing of the merger			60 days
resTORbio | Common Stock
Business Acquisition [Line Items]
Percentage of outstanding capital stock	25.00%	25.00%

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Business Combination - Schedule of Summarizes the Purchase Price in the Merger (Details) - USD ($) $ in Thousands	Sep. 15, 2020	Sep. 30, 2020
Business Acquisition [Line Items]
Contingent consideration liability		$ 2,880
resTORbio
Business Acquisition [Line Items]
Fair value of common stock shares of the combined company owned by resTORbio stockholders	$ 83,516
Contingent consideration liability	2,880
Estimated fair value of modified stock options and restricted stock units attributable to pre-combination services	626
Purchase price	$ 87,022

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Business Combination - Schedule of Estimated Share Consideration of Combined Company (Details) - resTORbio $ / shares in Units, $ in Thousands	Sep. 15, 2020 USD ($) $ / shares shares
Business Acquisition [Line Items]
Number of shares of the combined company owned by resTORbio stockholders | shares	5,207,695
Multiplied by the fair value per share of resTORbio common stock | $ / shares	$ 16.59
Acquisition date fair value of resTORbio	$ 86,396
Less: portion of the fair value to be distributed as CVR	(2,880)
Fair value of common stock shares of the combined company owned by resTORbio stockholders	$ 83,516

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Business Combination - Schedule of Estimated Share Consideration of Combined Company (Parenthetical) (Details)	Sep. 15, 2020 shares
resTORbio
Business Acquisition [Line Items]
Number of shares of the combined company owned by resTORbio stockholders	5,207,695

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Business Combination - Schedule of Summarizes the Purchase Price in the Merger (Parenthetical) (Details) - resTORbio	Sep. 15, 2020 shares
Business Acquisition [Line Items]
Unvested restricted stock units outstanding	91,309
Common stock share issued on a net settlement basis	55,854
Number of shares of surviving stock options	81,370

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Business Combination - Schedule of Summarizes the Allocation of the Purchase Price to the Net Tangible and Intangible Assets Acquired (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Net assets acquired:
Goodwill	$ 20,739
resTORbio
Net assets acquired:
Cash and cash equivalents	63,869
Prepaid expenses and other current assets	2,505
Property and equipment	318
IPR&D	3,490
Restricted cash	245
Accounts payable	(1,316)
Accrued and other current liabilities	(2,421)
Other liabilities	(40)
Deferred tax liability	(367)
Goodwill	20,739
Purchase price	$ 87,022

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Business Combination - Schedule of Supplemental Unaudited Pro Forma Information (Details) - resTORbio - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Revenue	$ 3,028	$ (7,047)	$ 12,493	$ (974)
Net loss	$ (9,791)	$ (53,794)	$ (26,424)	$ (100,142)

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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	$ 23,170	$ 69,613
Total fair value of liabilities	2,880	1,881
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	10	7,232
Cash Equivalents
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	10	7,232
Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	2,749	17,892
Fair Value Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	10	7,232
Fair Value Level 1 | Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	10	7,232
Fair Value Level 1 | Cash Equivalents
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	10	7,232
Fair Value Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	23,160	62,381
Fair Value Level 2 | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	2,749	17,892
Fair Value Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of liabilities	2,880	1,881
Asset Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	14,689	19,598
Asset Backed Securities | Fair Value Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	14,689	19,598
Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	5,722	19,394
Corporate Debt Securities | Fair Value Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	5,722	19,394
Marketable Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	23,160	62,381
Marketable Securities | Fair Value Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets	23,160	62,381
Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of liabilities	2,880
Contingent Consideration [Member] | Fair Value Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of liabilities	$ 2,880
US Government Agency Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets		5,497
US Government Agency Bonds | Fair Value Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of assets		5,497
Redeemable Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of liabilities		1,881
Redeemable Convertible Preferred Stock Warrant Liability | Fair Value Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of liabilities		$ 1,881

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Fair Value Measurements - Schedule of Changes in Fair Value of Level 3 Financial Instruments (Details) - Fair Value Level 3 - Measure of Changes in Fair Value - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Redeemable Convertible Preferred Stock Tranche Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value, beginning balance		$ 3,113
Recognition of preferred stock warrant liabilities		0
Change in the fair value included in other income, net		(1,970)
Settlement		0
Termination		(1,143)
Fair value, ending balance		0
TRDF Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value, beginning balance		142
Recognition of preferred stock warrant liabilities		0
Change in the fair value included in other income, net		(54)
Settlement		(88)
Termination		0
Fair value, ending balance		0
Redeemable Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value, beginning balance	$ 1,881	0
Recognition of preferred stock warrant liabilities	144	2,131
Change in the fair value included in other income, net	897	(62)
Settlement		0
Termination		0
Fair value, ending balance	0	$ 2,069
Conversion of convertible preferred stock warrant into common stock warrant in connection with Merger	$ (2,922)

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Marketable Debt Securities - Schedule of Marketable Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 23,077	$ 62,358
Unrealized Losses		(7)
Unrealized Gains	83	30
Fair Value	23,160	62,381
Asset Backed Securities
Marketable Securities [Line Items]
Amortized Cost	14,639	19,589
Unrealized Losses		(1)
Unrealized Gains	50	10
Fair Value	14,689	19,598
Corporate Debt Securities
Marketable Securities [Line Items]
Amortized Cost	5,700	19,387
Unrealized Losses		(3)
Unrealized Gains	22	9
Fair Value	5,722	19,393
Commercial Paper
Marketable Securities [Line Items]
Amortized Cost	2,738	17,882
Unrealized Gains	11	11
Fair Value	$ 2,749	17,893
US Government Agency Bonds
Marketable Securities [Line Items]
Amortized Cost		5,500
Unrealized Losses		(3)
Fair Value		$ 5,497

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Marketable Debt Securities - Summary of Classification of Marketable Debt Securities in Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Short-term marketable debt securities	$ 23,160	$ 51,793
Long-term marketable debt securities		10,588
Marketable debt securities	$ 23,160	$ 62,381

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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 2,416	$ 615
Prepaid insurance	3,353	57
Tax receivable	3,400	722
Interest receivable	67	213
Other current assets	55	179
Total prepaid expenses and other current assets	$ 9,291	$ 1,786

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Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total property and equipment	$ 6,592	$ 5,759
Less: Accumulated depreciation and amortization	(4,549)	(3,638)
Property and equipment, net	2,043	2,121
Laboratory Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	$ 4,305	3,872
Useful life (in years)	3 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 1,406	1,327
Useful life (in years)	Lesser of useful life or lease term
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	$ 526	68
Useful life (in years)	3 years
Construction In Progress
Property Plant And Equipment [Line Items]
Total property and equipment	$ 94	300
Computer Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	$ 91	42
Useful life (in years)	3 years
Software
Property Plant And Equipment [Line Items]
Total property and equipment	$ 170	$ 150
Useful life (in years)	3 years

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Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Depreciation and amortization expense	$ 300	$ 300	$ 911	$ 962

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Accrued and Other Current Liabilities - Summary of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accrued compensation	$ 4,455	$ 1,359
Accrued research and development expenses	552	450
Accrued professional services	1,016	301
Accrued other liabilities	826	710
Total accrued and other liabilities	$ 6,849	$ 2,820

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Term Loan - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Apr. 28, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Warrant exercise price	$ 11.3177		$ 1.4034
Loan availability end date	Oct. 28, 2021
Loan amount drawn	$ 0
Number of warrants exercised	$ 0
Deferred debt issuance cost	$ 100,000
Incremental expense	0
Debt issuance costs, gross	$ 200,000
Common Stock
Class Of Warrant Or Right [Line Items]
Number of securities called		5,301
Series B Convertible Preferred Stock [ Member ]
Class Of Warrant Or Right [Line Items]
Warrant exercise price		$ 1.4034
Number of securities called		42,753
Maximum
Class Of Warrant Or Right [Line Items]
Term loan to finance leasehold improvements		$ 12,000,000.0
Maximum | Common Stock
Class Of Warrant Or Right [Line Items]
Number of additional securities called		15,903
Maximum | Series B Convertible Preferred Stock [ Member ]
Class Of Warrant Or Right [Line Items]
Number of additional securities called		128,260
Minimum | Prime Rate
Class Of Warrant Or Right [Line Items]
Interest rate for term loan to finance leasehold improvements		0.25%

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Regeneron License and Collaboration Arrangement - Additional Information (Details) - Regeneron Pharmaceuticals, Inc. - USD ($) $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Jul. 29, 2016	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Non refundable upfront payment received	$ 25.0
Additional payment for research funding received	$ 20.0							$ 5.0	$ 5.0
License agreement termination description	12 years
Contract research term period	5 years
Upfront payment	$ 25.0					$ 25.0
Licence agreement cumulative revenue recognised			$ 5.0		$ 10.0	25.6	$ 11.1
License agreement cumulative revenue reduction recognised				$ 6.6
Increase in estimated transaction price			$ 10.0
License and collaboration revenue		$ 3.0		$ (7.0)		12.5	(1.0)
Contract liability						$ 19.4	$ 23.9
Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Licence agreement additional amount payable of option exercise fees	$ 100.0

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Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Contract Asset
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Additions		$ 10,000
Additions (Deductions)	[1]	(10,000)
Contract Liability
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Balance at beginning of period		21,883	$ 22,878
Additions		10,000
Additions (Deductions)	[1]	(12,493)	974
Balance at end of period		$ 19,390	$ 23,852

[1] Additions (deductions) to contract liabilities relate to deferred revenue derecognized (recognized) as revenue during the reporting period.

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License Funding and Other Agreements Related to the CVR - Additional Information (Details) $ in Millions	1 Months Ended	9 Months Ended
	May 31, 2019 USD ($)	Sep. 30, 2020 USD ($) Right	Mar. 23, 2017 USD ($)
National Institute of Health
Research And Development Arrangement Contract To Perform For Others [Line Items]
Grant term	5 years
Grants receivable	$ 1.5
Qualifying expenses		$ 0.7
National Institute of Health | Funding Agreement
Research And Development Arrangement Contract To Perform For Others [Line Items]
Qualifying expenses		$ 0.7
Novartis License Agreement | Novartis International Pharmaceutical Ltd.
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement termination description		The agreement may be terminated by either party upon a material breach of obligation by the other party that is not cured with 60 days after written notice. resTORbio may terminate the agreement in its entirety or on a product-by-product or country-by-country basis with or without cause with 60 days’ prior written notice.
Novartis License Agreement | Novartis International Pharmaceutical Ltd. | Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Aggregate amount payable upon satisfaction of clinical milestones			$ 4.3
Aggregate amount payable upon satisfaction of regulatory milestones for first indication approved			24.0
Aggregate amount payable upon satisfaction of regulatory milestones for second indication approved			18.0
Aggregate amount payable upon satisfaction of commercial milestones			$ 125.0
Contingent Value Rights Agreement [Member] | COVID-19 [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Common stock value right | Right		1
Total fees and expenses related to clinical trials		$ 3.0

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Commitment and Contingencies - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Lawsuit	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Long Term Purchase Commitment [Line Items]
Lease payments	$ 0.2	$ 0.2	$ 0.6	$ 0.5
Lawsuits Filed Against Company | Lawsuit			5
Litigation settlement expense			$ 0.2
Maximum
Long Term Purchase Commitment [Line Items]
Lawsuits Filed Against Company | Lawsuit			7
Putative Class [Member]
Long Term Purchase Commitment [Line Items]
Number of settled and dismissed lawsuits | Lawsuit			8
Menlo Park Lease Agreement [Member]
Long Term Purchase Commitment [Line Items]
Letters of Credit issued amount	0.2		$ 0.2
Redwood City Lease Agreement [Member]
Long Term Purchase Commitment [Line Items]
Letters of Credit issued amount					$ 4.1
Boston, Massachusetts [Member]
Long Term Purchase Commitment [Line Items]
Letters of Credit issued amount	$ 0.2		$ 0.2

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Commitments and Contingencies - Summary of Obligations Future Minimum Lease Payments (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2020	$ 1,018
2021	4,124
2022	3,560
2023	3,428
2024	3,525
Years thereafter	17,371
Total	$ 33,026

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Redeemable Convertible Preferred Stock (converted to Common Stock) - Summary of Redeemable Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands	Dec. 31, 2019 USD ($) $ / shares shares
Temporary Equity [Line Items]
Shares Authorized	99,363,444
Shares Issued and Outstanding	97,166,921
Carrying Value | $	$ 114,083
Liquidation Preference | $	$ 128,195
Common Stock Issued Upon Conversion (1)	12,048,671	[1]
Series A Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	37,104,185
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	37,104,185
Carrying Value | $	$ 35,960
Liquidation Preference | $	$ 44,525
Common Stock Issued Upon Conversion (1)	4,600,920	[1]
Series A-1 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	629,633
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	629,633
Carrying Value | $	$ 447
Liquidation Preference | $	$ 756
Common Stock Issued Upon Conversion (1)	78,074	[1]
Series A-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	2,428,688
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	2,428,688
Carrying Value | $	$ 1,749
Liquidation Preference | $	$ 2,914
Common Stock Issued Upon Conversion (1)	301,157	[1]
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	59,200,938
Original Issue Price | $ / shares	$ 1.40
Shares Issued and Outstanding	57,004,415
Carrying Value | $	$ 75,927
Liquidation Preference | $	$ 80,000
Common Stock Issued Upon Conversion (1)	7,068,520	[1]

[1] Adjusted to reflect the Exchange Ratio.

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Redeemable Convertible Preferred Stock (converted to Common Stock) - Additional Information (Details) - shares		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Number of common stock shares issued upon conversion	[1]				12,048,671
Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Number of common stock shares issued upon conversion		12,048,671
Number of shares outstanding		0	97,166,921	97,166,921	97,166,921	97,166,921	40,162,506	40,162,506	40,094,850

[1] Adjusted to reflect the Exchange Ratio.

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 15, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Number of warrants, Outstanding and exercisable to purchase preferred shares						1,781,387
Warrants outstanding and exercisable, Weighted average exercise price	$ 11.3177		$ 11.3177			$ 1.4034
Fair value of warrants outstanding					$ 2,900
Change in fair value of redeemable convertible preferred stock warrant liability			$ 897	$ (62)
Series B Warrants
Class Of Warrant Or Right [Line Items]
Fair value of warrants outstanding						$ 1,900
Series B Warrants | Maximum
Class Of Warrant Or Right [Line Items]
Change in fair value of redeemable convertible preferred stock warrant liability	$ 900	$ 100	$ 800	$ 100
Redeemable Convertible Preferred Stock | Series B Warrants
Class Of Warrant Or Right [Line Items]
Number of warrants, Outstanding and exercisable to purchase preferred shares	1,781,387		1,781,387
Warrants outstanding and exercisable, Weighted average exercise price	$ 1.4034		$ 1.4034

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Redeemable Convertible Preferred Stock Warrant Liability Using Black-Scholes Option Pricing Model (Details)	Sep. 14, 2020 $ / shares	Apr. 28, 2020 $ / shares	Dec. 31, 2019 $ / shares
Share Price
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement price	$ 16.59	$ 11.61	$ 11.32
Expected term (years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement term		7 years
Expected term (years) | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement term	5 years 10 months 9 days		6 years 6 months 25 days
Expected term (years) | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement term	6 years 7 months 13 days		6 years 8 months 26 days
Expected volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input		91.17
Expected volatility | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	81.1		82.1
Expected volatility | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	82.1		93.3
Risk-free interest rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input		0.52
Risk-free interest rate | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.35		1.80
Risk-free interest rate | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.42		1.81
Dividend yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0	0	0

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Outstanding Warrants (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Liabilities And Stockholders Equity [Abstract]
Number of warrants, Outstanding and exercisable to purchase preferred shares as of December 31, 2019	1,781,387
Number of warrants, Issued	128,260
Number of warrants, Converted to warrants for the purchase of common stock and adjusted for the Exchange Ratio and Reverse Stock Split	(1,672,854)
Number of warrants, Outstanding and exercisable to purchase common stock as of September 30, 2020	236,793
Warrant exercise price	$ 11.3177	$ 1.4034
Warrants outstanding and exercisable, Weighted average remaining contractual term	5 years 11 months 8 days	6 years 7 months 20 days

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Outstanding Warrants to Purchase Shares of Common Stock (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Number of Shares of Common Stock Issuable	236,793
Warrant exercise price	$ 11.3177	$ 1.4034
September 15, 2020 Warrant One
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 15, 2020
Number of Shares of Common Stock Issuable	101,610
Warrant exercise price	$ 11.3177
Expiration Date	Jul. 25, 2026
September 15, 2020 Warrant Two
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 15, 2020
Number of Shares of Common Stock Issuable	30,924
Warrant exercise price	$ 11.3177
Expiration Date	Aug. 21, 2026
September 15, 2020 Warrant Three
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 15, 2020
Number of Shares of Common Stock Issuable	77,312
Warrant exercise price	$ 11.3177
Expiration Date	Sep. 19, 2026
September 15, 2020 Warrant Four
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 15, 2020
Number of Shares of Common Stock Issuable	11,044
Warrant exercise price	$ 11.3177
Expiration Date	Sep. 26, 2026
September 15, 2020 Warrant Five
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 15, 2020
Number of Shares of Common Stock Issuable	15,903
Warrant exercise price	$ 11.3177
Expiration Date	Apr. 28, 2027

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Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Outstanding Warrants to Purchase Shares of Redeemable Convertible Preferred Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2020
Class Of Warrant Or Right [Line Items]
Number of Shares of Common Stock Issuable		236,793
Warrant exercise price	$ 1.4034	$ 11.3177
Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Number of Shares of Common Stock Issuable	1,781,387
Series B Warrants | Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrant exercise price		$ 1.4034
Series B Warrants | July 25, 2019 Warrant | Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Issuance Date	Jul. 25, 2019
Number of Shares of Common Stock Issuable	819,438
Warrant exercise price	$ 1.4034
Expiration Date	Jul. 25, 2026
Series B Warrants | August 21, 2019 Warrant | Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Issuance Date	Aug. 21, 2019
Number of Shares of Common Stock Issuable	249,394
Warrant exercise price	$ 1.4034
Expiration Date	Aug. 21, 2026
Series B Warrants | September 19, 2019 Warrant | Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 19, 2019
Number of Shares of Common Stock Issuable	623,486
Warrant exercise price	$ 1.4034
Expiration Date	Sep. 19, 2026
Series B Warrants | September 26, 2019 Warrant | Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Issuance Date	Sep. 26, 2019
Number of Shares of Common Stock Issuable	89,069
Warrant exercise price	$ 1.4034
Expiration Date	Sep. 26, 2026

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Stock-Based Compensation - Schedule of Number of Shares of Common Stock Reserved for Future Issuance (Details) - shares	Sep. 30, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance	5,593,764	14,834,849
Stock Options Available for Future Grant
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance	2,098,174	653,136
Options Issued and Outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance	3,269,399	1,860,646
Redeemable Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance		12,048,671
Conversion of Additional Authorized and Unissued Redeemable Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance		51,506
Redeemable Convertible Preferred Stock Warrant Liability
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance		220,890
Common Stock Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for future issuance	226,191

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Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options exercised, Weighted-Average Exercise Price | $ / shares	$ 16.11
Options Issued and Outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, beginning, Number of Shares Available for Grant	653,136
Assumed as part of merger, Number of Shares Available for Grant	2,707,144
Options granted, Number of Shares Available for Grant	(1,517,446)
Options forfeited or cancelled, Number of Shares Available for Grant	255,340
Outstanding, ending, Number of Shares Available for Grant	2,098,174	653,136
Outstanding, beginning, Number of Shares Underlying Outstanding Options	1,860,646
Assumed as part of the Merger, Number of Shares Underlying Oustanding Options	81,370
Options granted, Number of Shares Underlying Outstanding Options	1,713,344
Options exercised, Number of Shares Underlying Outstanding Options	(123,141)
Options forfeited or cancelled, Number of Shares Underlying Outstanding Options	(262,820)
Outstanding, ending, Number of Shares Underlying Outstanding Options	3,269,399	1,860,646
Shares exercisable, Number of Shares Underlying Outstanding Options	1,195,101
Vested and expected to vest, Number of Shares Underlying Outstanding Options	3,269,399
Outstanding, beginning, Weighted-Average Exercise Price | $ / shares	$ 4.05
Assumed as part of the Merger, Weighted-Average Exercise Price | $ / shares	8.39
Options granted, Weighted-Average Exercise Price | $ / shares	16.06
Options exercised, Weighted-Average Exercise Price | $ / shares	1.57
Options forfeited or cancelled, Weighted-Average Exercise Price | $ / shares	4.80
Outstanding, ending, Weighted-Average Exercise Price | $ / shares	10.49	$ 4.05
Shares exercisable, Weighted-Average Exercise Price | $ / shares	4.20
Vested and expected to vest, Weighted-Average Exercise Price | $ / shares	$ 10.49
Outstanding, Weighted-Average Remaining Contract Term	7 years 8 months 23 days	8 years 6 months 10 days
Shares exercisable, Outstanding, Weighted-Average Remaining Contract Term	4 years 11 months 12 days
Vested and expected to vest, Weighted-Average Remaining Contract Term	7 years 8 months 23 days
Outstanding, beginning, Aggregate Intrinsic Value | $	$ 11,780	$ 5,812
Shares exercisable, Aggregate Intrinsic Value | $	9,246
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 11,780

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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 2,966	$ 391	$ 3,616	$ 865
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	951	54	1,125	191
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 2,015	$ 337	$ 2,491	$ 674

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 17, 2020	Jan. 01, 2020	Jan. 01, 2019	May 07, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance					195,898			195,898
Options exercised, Weighted-Average Exercise Price								$ 16.11
Total stock-based compensation expense					$ 2,966		$ 391	$ 3,616	$ 865
Merger
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense					100
Option granted	16,931
Options granted, Weighted-Average Exercise Price	$ 16.11
Merger | Share-based Payment Arrangement, Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights								one-third of the shares vesting on the first anniversary
Merger | Share-based Payment Arrangement, Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights								one-third of the shares vesting in 12 equal monthly installments following such first anniversary
Merger | Share-based Payment Arrangement, Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights								one-third of the shares vesting in accordance with the terms of his Transition Agreement.
CEO Stock Option Modification
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense					$ 600
CEO Stock Option Modification | Scenario Forecast
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense				$ 100
2018 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of additional shares added on outstanding shares								4.00%
2017 and 2018 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock available for grant					1,462,006			1,462,006
Number of shares reserved for issuance					1,326,508			1,326,508
Options exercised, Weighted-Average Exercise Price								$ 15.64
2014 Stock Incentive Plan Member
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance					69,014			69,014
Options exercised, Weighted-Average Exercise Price								$ 1.27
2015 Stock Incentive Plan Member
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance					1,677,979			1,677,979
Options exercised, Weighted-Average Exercise Price								$ 6.14
2017 and 2018 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock available for grant					636,168			636,168
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of additional shares added on outstanding shares										1.00%
Number of shares reserved for issuance										39,290
Number of additional shares reserved for issuance		131,432	79,369
Number Of Shares Available For Sale Under Employee Stock Purchase Plan						0
2018 Employee Stock Purchase Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares reserved for issuance								77,703

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Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	$ (14,779)	$ (14,778)	$ (27,720)	$ (21,560)
Weighted-average common shares used in computing net loss per share attributable to common stockholders, basic and diluted	5,208,887	2,149,986	3,190,557	2,133,645
Net loss per share attributable to common stockholders, basic and diluted	$ (2.84)	$ (6.87)	$ (8.69)	$ (10.10)

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Net Loss Per Share - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,495,590	13,589,161
Options To Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,269,399	1,319,600
Common Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	226,191
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share		12,048,671
Redeemable Convertible Preferred Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share		220,890

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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Income Taxes Disclosure [Line Items]
Income tax expense (benefit)	$ 3	$ (2,676)	$ 1
COVID-19
Income Taxes Disclosure [Line Items]
Income tax expense (benefit)		$ (2,700)
Operating loss carryback duration under CARES Act		5 years
Percentage of net operating loss carryforwards		80.00%

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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Preferred stock shares issued	0		0		0
Revenue—related party	$ 3,028	$ (7,047)	$ 12,493	$ (974)
Regeneron Pharmaceuticals, Inc.
Related Party Transaction [Line Items]
Revenue—related party	3,000	$ (7,000)	12,500	$ (1,000)
Accounts receivable	0		0
Deferred revenue	$ 19,400		$ 19,400
Regeneron Pharmaceuticals, Inc. | Series B Convertible Preferred Stock [ Member ]
Related Party Transaction [Line Items]
Preferred stock shares issued	883,568		883,568		883,568

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Subsequent Events - Additional Information (Details)	Oct. 22, 2020
Subsequent Event
Subsequent Event [Line Items]
Subsequent event, description	On October 22, 2020, the U.S. Food and Drug Administration cleared the Company’s Investigational New Drug (“IND”) application for ADI-001, an allogeneic gamma delta T cell therapy expressing a chimeric antigen receptor (“CAR”) targeting CD20 for treatment of non-Hodgkin’s lymphoma (“NHL”). The active IND enables the Company to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients.