10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

________________________________

FORM 10-Q

________________________________

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

For the quarterly period ended September 30, 2018

OR

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

Commission File Number: 001-33958

SELLAS Life Sciences Group, Inc.

(Exact name of registrant as specified in its charter)

________________________________

Delaware	20-8099512
(State of incorporation)	(I.R.S. Employer Identification No.)

15 West 38^th Street, 10^th Floor, New York, NY 10018

(917) 438-4353

(Address, including zip code, and telephone number, including

area code, of registrant's principal executive offices)

________________________________

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  x    No  o

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 time that the registrant was required to submit such files).   Yes  x    No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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 (Check one):

Large accelerated filer	o	Accelerated filer	o
Non-accelerated filer	x	Smaller reporting company	x
Emerging growth company	o

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. o

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

As of November 9, 2018, SELLAS Life Sciences Group, Inc. had outstanding 22,026,476 shares of common stock, $0.0001 par value per share, exclusive of treasury shares.

SELLAS LIFE SCIENCES GROUP, INC.

FORM 10-Q - Quarterly Report

For the Quarter Ended September 30, 2018

TABLE OF CONTENTS

Part No.	Item No.	Description	Page No.
I		FINANCIAL INFORMATION
	1	Financial Statements	3
		Condensed Consolidated Balance Sheets as of September 30, 2018 (unaudited) and December 31, 2017	3
		Unaudited Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2018 and 2017	4
		Unaudited Condensed Consolidated Statement of Stockholders' Equity for the nine months ended September 30, 2018	5
		Unaudited Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2018 and 2017	6
		Unaudited Notes to Condensed Consolidated Financial Statements	7
	2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
	3	Quantitative and Qualitative Disclosures About Market Risk	34
	4	Controls and Procedures	35
II		OTHER INFORMATION
	1	Legal Proceedings	36
	1A	Risk Factors	36
	2	Unregistered Sales of Equity Securities and Use of Proceeds	36
	3	Defaults Upon Senior Securities	36
	4	Mine Safety Disclosures	36
	5	Other Information	36
	6	Exhibits	36
Signatures

1

SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS

Some of the information contained in this quarterly report on Form 10-Q may include forward-looking statements that reflect our current views with respect to our development programs, business strategy, business plan, financial performance and other future events. These statements include forward-looking statements both with respect to us, specifically, and our industry, in general. Such forward-looking statements include the words “expect,” “intend,” “plan,” “believe,” “project,” “estimate,” “may,” “should,” “anticipate,” “will” and similar statements of a future or forward-looking nature identify forward-looking statements.

Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based only on our current beliefs, expectations and assumptions regarding the future of our business, future plans and strategies, projections, anticipated events and trends, the economy and other future conditions. Forward-looking statements are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict and many of which are outside of our control. There are or will be important factors that could cause actual results to differ materially from those indicated in these statements. These factors include, but are not limited to, those factors set forth in the sections captioned “Risk Factors,” “Legal Proceedings,” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in this quarterly report on Form 10-Q, in the "Management's Discussion and Analysis of Financial Condition and Results of Operations" section of our annual report on Form 10-K for the year ended December 31, 2017 as filed with the Securities and Exchange Commission, or SEC, on April 13, 2018, or the 2017 Annual Report, and under the caption "Risk Factors" in Exhibit 99.1 in our Current Report on Form 8-K dated July 18, 2018, all of which you should review carefully. We undertake no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law.

2

PART I FINANCIAL INFORMATION

ITEM  1. FINANCIAL STATEMENTS

SELLAS LIFE SCIENCES GROUP, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Amounts in thousands, except share and per share data)

	September 30, 2018			December 31, 2017
ASSETS	(Unaudited)
Current assets:
Cash and cash equivalents	$	9,968		$	2,319
Restricted cash and cash equivalents	114			10,431
Other receivable	6,600			—
Litigation settlement insurance recovery	474			—
Prepaid expenses and other current assets	651			337
Total current assets	17,807			13,087
In-process research and development	17,600			17,600
Goodwill	1,914			1,914
Deposits and other assets	1,149			925
Total assets	$	38,470		$	33,526
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt	$	76		$	8,377
Accounts payable	7,238			11,691
Accrued expenses and other current liabilities	4,683			3,201
Litigation settlement payable	—			1,300
Total current liabilities	11,997			24,569
Deferred tax liability	1,722			1,673
Warrant liability	975			1,309
Contingent consideration	5,319			1,294
Long-term debt, net of current portion	—			2,611
Total liabilities	20,013			31,456
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; Series A convertible preferred stock, 17,500 shares designated; no shares issued and outstanding at September 30, 2018 and December 31, 2017	—			—
Common stock, $0.0001 par value; 350,000,000 shares authorized, 20,501,476 shares issued and outstanding at September 30, 2018; 5,766,891 shares issued and outstanding at December 31, 2017	2			1
Additional paid-in capital	86,987			56,254
Accumulated deficit	(68,532		)	(54,185		)
Total stockholders’ equity	18,457			2,070
Total liabilities and stockholders’ equity	$	38,470		$	33,526

See accompanying notes to condensed consolidated financial statements.

3

SELLAS LIFE SCIENCES GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Amounts in thousands, except share and per share data)

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Operating expenses:
Research and development	$	1,720		$	1,068		$	5,116		$	5,079
General and administrative	1,341			3,222			10,130			9,350
Total operating expenses and operating loss	(3,061		)	(4,290		)	(15,246		)	(14,429		)
Non-operating income (expense):
Change in fair value of warrant liability	2,241			—			5,340			—
Change in fair value of contingent consideration	(162		)	—			(4,025		)	—
Loss on settlement of liability-classified warrants	—			—			(727		)	—
Gain on extinguishment of debt	766			—			766			—
Interest expense, net	(74		)	(102		)	(292		)	(360		)
Total non-operating income (expense), net	2,771			(102		)	1,062			(360		)
Loss before income taxes	(290		)	(4,392		)	(14,184		)	(14,789		)
Income tax expense	—			63			163			180
Net loss	(290		)	(4,455		)	(14,347		)	(14,969		)
Deemed dividend arising from beneficial conversion feature of convertible preferred stock	—			—			(4,436		)	—
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision	$	(8,654	)	$	—		(8,654		)	—
Impact of anti-dilution protection on liability-classified warrants	$	(491	)	$	—		(491		)	—
Net loss attributable to common stockholders	$	(9,435	)	$	(4,455	)	$	(27,928	)	$	(14,969	)
Per share information:
Net loss per common share attributable to common stockholders, basic and diluted	$	(0.53	)	$	(2.27	)	$	(2.75	)	$	(4.56	)
Weighted-average common shares outstanding, basic and diluted	17,635,671			1,962,822			10,161,153			3,284,351

See accompanying notes to condensed consolidated financial statements.

4

SELLAS LIFE SCIENCES GROUP, INC.

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY

(Amounts in thousands, except share amounts)

(Unaudited)

	Preferred Stock				Common Stock			Additional Paid-In Capital			Accumulated Deficit			Total Stockholders' Equity
	Shares		Amount		Shares	Amount
Balance at December 31, 2017	—		$	—	5,766,891	$	1	$	56,254		$	(54,185	)	$	2,070
Issuance of common stock and common stock warrants, net of issuance costs	—		—		6,845,000	1		21,563			—			21,564
Issuance of Series A convertible preferred stock, net of offering costs	10,700		—		—	—		9,647			—			9,647
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock offering	—		—		—	—		(5,039		)	—			(5,039		)
Beneficial conversion feature arising from Series A convertible preferred stock	—		—		—	—		(4,436		)	—			(4,436		)
Deemed dividend arising from beneficial conversion feature of Series A convertible preferred stock	—		—		—	—		4,436			—			4,436
Conversion of Series A convertible preferred stock	(2,898	)	—		499,682	—		—			—			—
Issuance of common stock to Series A convertible preferred stockholders under most favored nation provision	(7,802	)	—		3,748,184	—		(8,654		)	—			(8,654		)
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision	—		—		—	—		8,654			—			8,654
Impact of anti-dilution protection on liability-classified warrants	—		—		—	—		(491		)	—			(491		)
Convertible preferred stock dividends	—		—		—	—		(487		)	—			(487		)
Issuance of common stock as repayment of principal and interest on long-term debt	—		—		715,277	—		2,896			—			2,896
Issuance of common stock in connection with litigation settlements	—		—		228,672	—		1,250			—			1,250
Issuance of common stock upon conversion of promissory notes	—		—		118,644	—		825			—			825
Issuance of common stock in connection with warrant exchange agreements	—		—		54,343	—		285			—			285
Issuance of common stock upon exercise of pre-funded warrants	—		—		2,524,783	—		—			—			—
Stock-based compensation	—		—		—	—		284			—			284
Net loss	—		—		—	—		—			(14,347		)	(14,347		)
Balance at September 30, 2018	—		$	—	20,501,476	$	2	$	86,987		$	(68,532	)	$	18,457

See accompanying notes to condensed consolidated financial statements.

5

SELLAS LIFE SCIENCES GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Amounts in thousands)

(Unaudited)

	For the nine months ended September 30,
	2018			2017
Cash flows from operating activities:
Net loss	$	(14,347	)	$	(14,969	)
Adjustment to reconcile net loss to net cash used in operating activities:
Gain on extinguishment of debt	(766		)	—
Non-cash interest expense	134			258
Deferred taxes	49			7
Loss on extinguishment of payables	—			634
Non-cash stock-based compensation	284			3,776
Amortization of research and development expense	—			257
Fair value of common stock issued in exchange for services	—			325
Fair value of common stock issued in connection with litigation settlements	1,250			—
Change in fair value of common stock warrants	(5,340		)	—
Change in fair value of contingent consideration	4,025			—
Loss on settlement of liability-classified warrants	727			—
Changes in operating assets and liabilities:
Other receivable	(6,600		)	—
Prepaid expenses and other assets	(538		)	3
Litigation settlement insurance recovery	(474		)	—
Accounts payable	(4,453		)	377
Accrued expenses and other current liabilities	182			85
Net cash used in operating activities	(25,867		)	(9,247		)
Cash flows from financing activities:
Net proceeds from issuance of Series A convertible preferred stock and common stock warrants	9,647			—
Proceeds from issuance of common stock	21,564			6,007
Dividends paid	(487		)	—
Principal payments on long-term debt	(7,525		)	(353		)
Net cash provided by financing activities	23,199			5,654
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents	(2,668		)	(3,593		)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the beginning of period	12,750			5,962
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the end of period	$	10,082		$	2,369
Supplemental disclosure of cash flow information:
Cash received during the periods for interest	$	166		$	—
Cash paid during the periods for interest	$	321		$	—
Supplemental disclosure of non-cash investing and financing activities:
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock recorded as issuance cost	$	5,039		$	—
Repayment of interest and principal on long-term debt through issuance of common stock	$	3,587		$	—
Reclassification of warrant liabilities upon exchange for shares of common stock	$	285		$	—
Impact of anti-dilution protection on liability-classified warrants	$	491		$	—
Debt issued in connection with warrant exchange agreements	$	966		$	—

See accompanying notes to condensed consolidated financial statements.

6

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Organization and Description of Business

Overview

SELLAS Life Sciences Group, Inc. (the "Company," or “SELLAS”) is a late-stage biopharmaceutical company focused on the development and commercialization of novel cancer immunotherapeutics for a broad range of indications.

Merger of Galena Biopharma, Inc. and SELLAS Life Sciences Group Ltd.

As used in this quarterly report on Form 10-Q, the words the “Company,” and “SELLAS” refer to SELLAS Life Sciences Group, Inc. and its consolidated subsidiaries following completion of the business combination with Galena Biopharma, Inc., a Delaware corporation ("Galena"). This business combination is referred to as the Merger.

On December 29, 2017, Galena completed the Merger with SELLAS Life Sciences Group, Ltd., a privately held Bermuda exempted company ("Private SELLAS"), in accordance with the terms of the Agreement and Plan of Merger and Reorganization, dated as of August 7, 2017 and amended November 5, 2017 (the "Merger Agreement"), among the Company, Sellas Intermediate Holdings I, Inc., Sellas Intermediate Holdings II, Inc., Galena Bermuda Merger Sub, Ltd., and Private SELLAS. As a result of the Merger, the Company’s business is now substantially comprised of the business of Private SELLAS, and although the Company is considered the legal acquiror of Private SELLAS, for accounting purposes, Private SELLAS is considered to have acquired the Company in the Merger. Consequently, the Merger was accounted for as a reverse acquisition and the Private SELLAS financial statements became the Company's financial statements.

Immediately prior to the Merger, Galena effected a 1-for-30 reverse stock split of its outstanding common stock, par value $0.0001 per share. Under the terms of the Merger Agreement, Galena issued shares of its common stock to Private SELLAS’ securityholders at an exchange ratio of 43.9972 shares of its common stock in exchange for each common share of Private SELLAS outstanding immediately prior to the Merger. The Company also assumed all of the restricted stock units (“RSUs”) issued and outstanding under the Private SELLAS Stock Incentive Plan #1, and all of the issued and outstanding warrants of Private SELLAS. Accordingly, such RSUs will now be settled in, and such warrants now are exercisable for, shares of the Company’s common stock. Accordingly, immediately after the Merger, there were 5,766,891 shares of the Company’s common stock outstanding, with the former Private SELLAS securityholders owning 67.5% of the Company’s fully diluted common stock, and the Company’s pre-Merger securityholders owning the remaining 32.5%. The number of shares and per share amounts of common stock in the accompanying condensed consolidated financial statements and notes to the condensed consolidated financial statements have been restated to give retroactive effect to the common stock conversion ratio and reverse stock split for all periods presented, including common stock options, RSUs, and common stock warrants.

Upon completion of the Merger, the Company’s name changed from “Galena Biopharma, Inc.” to “SELLAS Life Sciences Group, Inc.," the Company’s financial statements became those of Private SELLAS and the Company's common stock began trading on The Nasdaq Capital Market under a new ticker symbol “SLS” on January 2, 2018.

7

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

2. Liquidity

The Company has not generated any revenues, including from product sales, and has funded operations primarily from the proceeds of sales of its equity interests and convertible notes, as well as through the Merger. Substantial additional financing will be required by the Company to continue to fund its research and development activities. No assurance can be given that any such financing will be available when needed or that the Company’s research and development efforts will be successful.

On July 16, 2018, the Company closed an underwritten public offering (the "July 2018 Offering"), issuing 6,845,000 shares of common stock and 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other estimated July 2018 Offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

In addition to the proceeds from the July 2018 Offering, on March 7, 2018, the Company entered into a definitive securities purchase agreement to issue shares of its Series A convertible preferred stock (“Series A Convertible Preferred”) and warrants to purchase shares of its common stock in a private placement transaction to a select group of institutional investors. The sale of the aggregate 10,700 shares of Series A Convertible Preferred and 5.5 year warrants to acquire an aggregate of 1,383,631 shares of common stock at $6.59 per share closed in two tranches and resulted in aggregate gross proceeds to the Company of approximately $10.7 million. The Company closed the first tranche for approximately $6.0 million gross proceeds on March 9, 2018. The Company closed the second tranche of the remaining $4.7 million gross proceeds on May 1, 2018, following the receipt of necessary stockholder approval.

The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with third parties and other strategic alliances and business transactions.

The Company currently does not have any commitments to obtain additional funds and may be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with third parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently, consider various other strategic alternatives, including a merger or sale of the Company, or cease operations. If the Company engages in collaborations, it may receive lower consideration upon commercialization of such products than if it had not entered into such arrangements or if it entered into such arrangements at later stages in the product development process.

8

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

The Company has evaluated the guidance of Accounting Standards Codification ("ASC") 205-40, Presentation of Financial Statements - Going Concern, in order to determine whether there is substantial doubt about its ability to continue as a going concern for one year from the date its financial statements are available to be issued. The Company has prepared its condensed consolidated financial statements assuming that it will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred net losses since inception and it expects to generate losses from operations for the foreseeable future primarily due to research and development costs for its potential product candidates, which raises substantial doubt about the Company’s ability to continue as a going concern. Various internal and external factors will affect whether and when the Company’s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company’s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company’s financial condition and future operations. The consolidated 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 this uncertainty.

As of September 30, 2018, the Company had cash and cash equivalents of approximately $10.0 million, restricted cash balance of $0.1 million, other receivable of $6.6 million (received in November 2018), and $0.5 million in litigation insurance recovery (received in October 2018). In addition, the Company had outstanding accounts payable and accrued expenses of $11.9 million and indebtedness of $0.1 million as of September 30, 2018. The Company expects its existing cash as of September 30, 2018, including amounts received in October and November 2018, will enable the Company to fund its operating expenses and capital expenditure requirements through March 2019.

3. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the ASC and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Principles of Consolidation

The condensed consolidated financial statements include the financial statements of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation.

Unaudited Interim Results

These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company's annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the Securities and Exchange Commission ("SEC") on April 13, 2018 (the "2017 Annual Report"). The accompanying condensed consolidated financial statements at September 30, 2018 and for the three and nine months ended September 30, 2018 and 2017, are unaudited, but include all adjustments, consisting of normal recurring entries, that management believes to be necessary for a fair presentation of the periods presented. Interim results are not necessarily indicative of results for a full year. Balance sheet amounts as of December 31, 2017 have been derived from the audited financial statements as of that date.

9

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Preferred Stock

The Company applies the accounting standards for distinguishing liabilities from equity when determining the classification and measurement of its preferred stock. Preferred shares subject to mandatory redemption are classified as liability instruments and are measured at fair value. Conditionally redeemable preferred shares (including preferred shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, preferred shares are classified as stockholders’ equity.

Convertible Instruments

The Company applies the accounting standards for derivatives and hedging and for distinguishing liabilities from equity when accounting for hybrid contracts that feature conversion options. The accounting standards require companies to bifurcate conversion options from their host instruments and account for them as free-standing derivative financial instruments according to certain criteria. The criteria include circumstances in which (i) the economic characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, (ii) the hybrid instrument that embodies both the embedded derivative instrument and the host contract is not re-measured at fair value under otherwise applicable generally accepted accounting principles with changes in fair value reported in earnings as they occur and (iii) a separate instrument with the same terms as the embedded derivative instrument would be considered a derivative instrument.

Conversion options that contain variable settlement features such as provisions to adjust the conversion price upon subsequent issuances of equity or equity linked securities at exercise prices more favorable than that featured in the hybrid contract generally result in their bifurcation from the host instrument.

The Company also records, when necessary, deemed dividends for the intrinsic value of the conversion options embedded in preferred stock based upon the difference between the fair value of the underlying common stock at the commitment date of the transaction and the effective conversion price embedded in the preferred stock.

Recent Accounting Pronouncements Pending Adoption

In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Accounting, which simplifies the accounting for share-based payments granted to nonemployees for goods and services. The ASU supersedes ASC 505-50 and expands the scope of ASC 718 to include all share-based payment arrangements related to the acquisition of goods and services from both nonemployees and employees. As a

result, most of the guidance in ASC 718 associated with employee share-based payments, including most of its requirements related to classification and measurement, applies to nonemployee share-based payment arrangements. ASU 2018-07 generally requires an entity to use a modified retrospective transition approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year, for all (1) liability-classified nonemployee awards that have not been settled as of the adoption date and (2) equity-classified nonemployee awards for which a measurement date has not been established. The guidance is applicable to public business entities for fiscal years beginning after December 15, 2019 and interim periods within those years. The Company is currently evaluating the potential impact of the adoption of this standard on its consolidated results of operations, financial position and cash flows and related disclosures.

In February 2016, the FASB issued ASU 2016-02, Leases. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, and No. 2018-11, Leases (Topic 842) - Targeted Improvements. The new standard establishes a right-of-use, or ROU, model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

10

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

In August 2018, FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 modifies, adds and removes certain specific the disclosure requirements on fair value measurements in Topic 820. The amendments in ASU 2018-13 are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

Recent Accounting Pronouncements Adopted

In November 2016, the FASB issued ASU No. 2016-18, Restricted Cash. ASU No. 2016-18 requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown in the statement of cash flows. In accordance with ASU No. 2016-18, the Company adopted this standard in the first quarter of 2018. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

The following table provides a reconciliation of the components of cash, cash equivalents, restricted cash, and restricted cash equivalents reported in the Company's condensed consolidated balance sheets to the total of the amount presented in the condensed consolidated statements of cash flows (in thousands):

	September 30, 2018		December 31, 2017
Cash and cash equivalents	$	9,968	$	2,319
Restricted cash and cash equivalents	114		10,431
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$	10,082	$	12,750

In connection with the Company's Senior Secured Debenture described in Notes 7 and 8, the Company was required to maintain a minimum of the lesser of $18.5 million or the outstanding principal amount of unencumbered cash in a restricted account. Any funds in the restricted account in excess of the outstanding principal balance were to be transferred to the Company's unrestricted account to fund its ongoing operations. As of December 31, 2017, the Company maintained $10.2 million of cash and cash equivalents in a restricted account. The Senior Secured Debenture was deemed to be no longer outstanding as of September 30, 2018. In addition, the Company maintained $0.1 million and $0.2 million as of September 30, 2018 and December 31, 2017, respectively, on hand with the Company's financial institutions as collateral for its corporate credit cards.

In May 2017, the FASB issued ASU No. 2017-09, Scope of Modification Accounting. ASU No. 2017-09 clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. This guidance is to be applied prospectively to awards modified on or after the adoption date and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, with early adoption permitted. In accordance with ASU No. 2017-09, the Company adopted this standard prospectively in the first quarter of 2018. The adoption of ASU No. 2017-09 did not have a material impact on the Company's condensed consolidated financial statements.

Reclassifications 

Certain prior year amounts have been reclassified to conform to current year presentation. These reclassifications had no effect on net loss per share.

11

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

4. Acquisition

On December 29, 2017, the Company completed the Merger with Private SELLAS as discussed in Note 1. The Merger was accounted for as a reverse merger under the acquisition method of accounting whereby Private SELLAS was considered to have acquired the Company for financial reporting purposes because, immediately upon completion of the Merger, Private SELLAS stockholders held a majority of the voting interest of the combined company.

The following summary pro forma condensed consolidated financial information reflects the Merger with Galena as if it had occurred on January 1, 2017 for purposes of the statements of operations. This summary pro forma information is not necessarily representative of what the Company’s results of operations would have been had the Merger in fact occurred on January 1, 2017, and is not intended to project the Company’s results of operations for any future period.

	Three Months Ended September 30, 2017			Nine Months Ended September 30, 2017
Net loss	$	(9,066	)	$	(21,690	)
Basic and diluted net loss per share	$	(1.61	)	$	4.92

Pro forma combined net loss includes an adjustment to reduce historical interest expense of $0.2 million and $0.3 million for the three and nine months ended September 30, 2017, respectively, due to the conversion of the convertible notes of $5.8 million. The Company excluded a $5.2 million impairment charge incurred by the Company and $3.3 million of transaction costs related to the Merger from the pro forma financial information for the three and nine months ended September 30, 2017.

5. Fair Value Measurements

The following tables present information about the Company's assets and liabilities measured at fair value on a recurring basis in the condensed consolidated balance sheets (in thousands):

Description	September 30, 2018		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	6,774	$	6,774	$	—	$	—
Total assets measured and recorded at fair value	$	6,774	$	6,774	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	975	$	—	$	—	$	975
Contingent consideration	5,319		—		—		5,319
Total liabilities measured and recorded at fair value	$	6,294	$	—	$	—	$	6,294

12

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Description	December 31, 2017		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	1,662	$	1,662	$	—	$	—
Restricted cash equivalents	10,245		10,245		—		—
Total assets measured and recorded at fair value	$	11,907	$	11,907	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	1,309	$	—	$	—	$	1,309
Contingent consideration	1,294		—		—		1,294
Total liabilities measured and recorded at fair value	$	2,603	$	—	$	—	$	2,603

The Company did not transfer any financial instruments into or out of Level 3 classification during the three and nine months endedSeptember 30, 2018 and 2017. See Note 10 for a reconciliation of the changes in the fair value of the warrant liability for the nine months endedSeptember 30, 2018.

A reconciliation of the change in the fair value of the contingent consideration liability for the nine months endedSeptember 30, 2018 is as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Contingent consideration, December 31, 2017	$	1,294
Change in the estimated fair value of the contingent consideration	4,025
Contingent consideration, September 30, 2018	$	5,319

The fair value of the contingent consideration is measured at the end of each reporting period using Level 3 inputs in a probability-weighted, discounted cash-outflow model. The contingent consideration relates to Galena’s acquisition of Apthera, Inc. in 2011 and the future contingent payments of up to $32.0 million based on the achievement of certain development and commercial milestones relating to the Company’s nelipepimut-S ("NeuVax^TM" or "NPS") product candidate. The contingent consideration is payable at the election of the Company in either cash or shares of common stock, provided that the Company may not issue any shares in satisfaction of any contingent consideration unless it has first obtained approval of its stockholders in accordance with Rule 5635(a) of the Nasdaq Marketplace Rules. The significant unobservable assumptions include the probability of achieving each milestone, the date the Company expects to reach the milestone, and a determination of present value factors used to discount future expected cash outflows. The change in the estimated fair value of the contingent consideration during the nine months endedSeptember 30, 2018 reflects an adjusted probability and timeline for the potential approval of NPS associated with the positive interim data in the triple-negative breast cancer cohort from the prospective, randomized, single-blinded, controlled Phase 2b investigator-sponsored clinical trial ("IST") of trastuzumab (Herceptin®) +/- NPS in HER2 1+/2+ breast cancer patients in the adjuvant setting to prevent recurrences that was announced on April 2, 2018.

13

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

6. Accrued Expenses and Other Current Liabilities

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

	September 30, 2018		December 31, 2017
Professional fees*	$	2,836	$	1,744
Compensation and related benefits	808		566
Clinical trial costs	583		51
Value-added tax	158		426
Rebates and returns of former commercial products	22		223
Other	276		191
Accrued expenses and other current liabilities	$	4,683	$	3,201

*Includes approximately $2.5 million of legal fees incurred related to the JGB litigation as described in Note 8 that was reimbursed to the Company in November 2018 by JGB.

7. Debt

	September 30, 2018		December 31, 2017
Debt
Current portion of Senior Secured Debenture	$	—	$	8,377
Short-term convertible promissory notes	76		—
Non-current portion of Senior Secured Debenture	—		2,611
Total debt	$	76	$	10,988

Senior Secured Debenture

On May 10, 2016, the Company's predecessor company, Galena, entered into a Securities Purchase Agreement (the “Securities Purchase Agreement”) with JGB (the "Purchaser") pursuant to which Galena sold to the JGB, at a 6.375% original issue discount, a $25.5 million Senior Secured Debenture (the "Senior Secured Debenture") and warrants to purchase up to 3,333 shares of the Company's common stock. Net proceeds to Galena from the sale of the Senior Secured Debenture and warrants, after payment of commissions and legal fees, were approximately $23.4 million.

The Senior Secured Debenture originally matured November 10, 2018, with accrued interest at 9% per year, payable monthly. In addition, on the maturity date of the Senior Secured Debenture (or such earlier date that the principal amount of the Senior Secured Debenture is paid in full by acceleration or otherwise) a fixed amount, which would have been deemed interest under the Senior Secured Debenture, equal to $0.8 million was due and payable to JGB on such date in, at the option of the Company, cash and, subject to the same conditions for the payment of interest, in shares of the Company’s common stock, or a combination of cash and the Company’s common stock.

The Company’s obligations under the Senior Secured Debenture were secured under a security agreement by a senior lien on all of the Company’s assets, including all of the Company’s interests in its consolidated subsidiaries. Private SELLAS was not a party to the security agreement. Under the terms of a subsidiary guarantee agreement, each subsidiary guaranteed the performance of the Company of the Securities Purchase Agreement, Senior Secured Debenture and related agreements.

•

14

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

The Company was required to maintain a minimum of the lesser of $18.5 million or the outstanding principal amount of unencumbered cash in a restricted account. Any funds in the restricted account in excess of the outstanding principal balance were transferred to the Company's unrestricted account to fund its ongoing operations. As of December 31, 2017, the Company maintained $10.2 million of cash and cash equivalents in a restricted account.

As of December 31, 2017, the outstanding principal balance of the Senior Secured Debenture was $10.2 million. In addition to the outstanding principal balance, the Senior Secured Debenture had $0.8 million of additional interest that was included in the current portion of long-term debt as of December 31, 2017. During the nine months ended September 30, 2018, JGB redeemed $2.8 million of outstanding principal, which the Company satisfied with 659,529 shares of its common stock and redeemed $0.6 million of outstanding principal, which the Company satisfied with cash. As a result of the redemptions during 2018, the Company transferred $1.8 million of restricted cash into unrestricted cash and cash equivalents which was used to fund the Company’s ongoing operations.

JGB commenced a lawsuit against the Company as described in Note 8 ("JGB Action"). On September 24, 2018, JGB unilaterally issued a directive to (i) the financial institution that maintained the restricted cash and cash equivalents and (ii) the manager of the account to liquidate all assets in the restricted account. As a result of such directive, approximately $8.5 million in cash was removed from the restricted account, $1.6 million in excess of the outstanding principal balance of the Senior Secured Debenture at the time of the removal. On October 16, 2018, JGB was required to deposit the $1.6 million excess that JGB removed from the restricted account into an escrow account, as ordered by the Court in the JGB Action, pending resolution of the dispute between the Company and JGB. On October 23, 2018, the Court entered an order, granting, among other things, the Company's Motion for Judgment seeking dismissal of JGB's amended complaint and allowing four of the Company's counterclaims to proceed to trial. As a result of the October 23rd Court order, on November 5, 2018, the parties to the JGB Action entered into a settlement agreement. The settlement agreement provides, among other things, that JGB make a one-time payment to the Company of $6.6 million, representing the $1.6 million excess cash removed from the amount in the restricted account from the outstanding principal balance of the Senior Secured Debenture and reimbursement of approximately $5.0 million of legal fees incurred by the Company. The Company recognized a gain on extinguishment of debt of $0.8 million that was previously accrued in long-term debt representing an additional interest payable at maturity as the amount is no longer required to be repaid by the Company. Accordingly, the Senior Secured Debenture is no longer outstanding and the related agreements have been terminated.

Short-term Convertible Promissory Notes

During the nine months ended September 30, 2018, the Company entered into convertible promissory notes in the principal amount of $1.0 million in exchange for the surrender and cancellation of warrants to purchase 412,667 shares of its common stock pursuant to the February 2017 offering by Galena. The convertible promissory notes accrue interest at a rate of 5% per annum and the remaining outstanding principal balance and accrued interest is due and payable in November 2018. The outstanding principal balance and accrued interest is convertible into shares of the Company's common stock at a conversion price equal to $7.00. In April 2018, $0.8 million of outstanding principal and accrued interest was converted into 118,644 shares of common stock. As of September 30, 2018, $0.1 million principal balance and accrued interest remains outstanding.

15

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

8. Legal Proceedings, Commitments and Contingencies

Legal Proceedings

From time to time, the Company is subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business, which may include employment matters, breach of contract disputes and stockholder litigation. Such actions and proceedings are subject to many uncertainties and to outcomes that are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its condensed consolidated financial statements for costs related to claims, including future legal costs, settlements and judgments, when the Company has assessed that a loss is probable and an amount can be reasonably estimated. If the reasonable estimate of a probable loss is a range, the Company records the most probable estimate of the loss or the minimum amount when no amount within the range is a better estimate than any other amount. The Company discloses a contingent liability even if the liability is not probable or the amount is not estimable, or both, if there is a reasonable possibility that a material loss may have been incurred. In the opinion of management, as of the date hereof, the amount of liability, if any, with respect to these matters, individually or in the aggregate, will not materially affect the Company’s consolidated results of operations, financial position or cash flows.

The Company’s predecessor company, Galena, was involved in multiple legal proceedings and administrative actions, including stockholder class actions, both state and federal, some of which are ongoing and to which the Company are now subject as a result of the Merger. The Company is also involved in litigation matters as follows:

On February 13, 2017, putative shareholder securities class action complaints were filed in federal court alleging, among other things, that the Company and certain of the Company's former officers and directors failed to disclose that Galena’s promotional practices for Abstral^® (fentanyl sublingual tablets) were allegedly improper and that Galena may be subject to civil and criminal liability, and that these alleged failures rendered Galena’s statements about its business misleading. The actions were consolidated, lead plaintiffs were named by the Court and a consolidated complaint was filed. The Company filed a motion to dismiss the consolidated complaint. On August 21, 2018, the Company's motion to dismiss the consolidated complaint was granted without prejudice to file an amended complaint. On September 20, 2018, the plaintiffs filed an amended complaint. On October 22, 2018, the Company filed a motion to dismiss the amended complaint.

In March 2017, a derivative complaint was filed in U.S. District Court for the District of New Jersey against the Company’s former directors and Galena, as a nominal defendant. In July 2017, a derivative complaint was filed in California state court against the Company’s former directors and Galena, as a nominal defendant. In January 2018, a derivative complaint was filed in the U.S. District Court for the District of New Jersey against the Company’s former directors, officers and employees, and the Company as a nominal defendant. In June 2018, a derivative complaint was filed in U.S. District Court for the Northern District of California against the Company’s current and former directors, and the Company as a nominal defendant. The plaintiff in the June 2018 case voluntarily withdrew his complaint from the U.S District Court of the Northern District of California and on August 27, 2018 refiled the complaint in the Court of Chancery of the State of Delaware. These complaints purport to assert derivative claims for breach of fiduciary duty on the Company’s behalf against the Company’s former directors and, in certain of the complaints, the Company’s current directors, and the Company’s former officers and former employees, based on substantially similar facts as alleged in the putative shareholder securities class action complaints mentioned above. The March 2017, July 2017, and January 2018 lawsuits are currently stayed pending resolution of motions to dismiss in the referenced securities class action. On October 29, 2018, the defendants in the August 2018 lawsuit notified the plaintiff of its intent to file a motion to dismiss the lawsuit.

16

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

In April 2017, a putative stockholder class action, captioned Patel vs. Galena Biopharma Inc. et. al, was filed in Delaware state court seeking relief under Section 225 of the Delaware General Corporation Law ("DGCL") and alleging breaches of fiduciary duties by Galena’s former board of directors and former interim chief executive officer regarding the proposals to amend Galena’s certificate of incorporation to increase the amount of authorized shares of common stock and effectuate a reverse stock split at the July 2016 and October 2016 stockholder meetings, respectively. On June 2, 2017, an amended verified complaint was filed along with a motion to expedite the proceedings. On June 20, 2017, the Court consolidated the claims into In re Galena Biopharma, Inc., C. A. No. 2017-0423-JTL. On July 24, 2017, Galena entered into a binding settlement term sheet, involvingpayment of $50,000 in cash and $1,250,000 in unrestricted shares of common stock. The Court enforced the settlement term sheet on November 30, 2017. On February 22, 2018, the plaintiff filed his brief in support of the settlement as well as his request for attorneys’ fees and an incentive award. On June 14, 2018, the Court entered an Order and Final Judgment approving the settlement and awarding attorneys’ fees to the plaintiff. All obligations related to the Order and Final Judgment were satisfied in full by the Company in June 2018. In October 2018, the Company received $0.5 million from its insurance carrier for previous amounts paid by the Company in excess of its deductible. The amount is recorded as a litigation insurance recovery as of September 30, 2018 in the Company's condensed consolidated balance sheet.

On or about April 9, 2018, JGB filed a lawsuit in the U.S. District Court for the Southern District of New York (the "Court") captioned JGB (Cayman) Newton, Ltd. v. Sellas Life Sciences Group, Inc., et al., Case 1:18-cv-3095 (DLC) (the "JGB Action"). The complaint in the JGB Action asserted claims under state law and federal securities law against the Company, the Company's Chief Executive Officer, Angelos M. Stergiou, M.D., ScD h.c., and the Company's former Interim Chief Financial Officer, Aleksey N. Krylov. On or about May 2, 2018, JGB filed an amended complaint, adding as defendants Jane Wasman, Stephen Ghiglieri, David Scheinberg, M.D., Robert Van Nostrand and John Varian, each of whom is a member of the Company's Board of Directors. On May 18, 2018, the Company filed an answer to the amended complaint and filed seven counterclaims. On June 18, 2018, the Company filed a motion for judgment on the pleadings and a motion to dismiss the amended complaint. On July 6, 2018, JGB filed a motion for partial judgment on the pleadings and motion to dismiss all of the Company's counterclaims. On September 24, 2018, without any prior written notice, JGB unilaterally directed that all of the funds, approximately $8.5 million in cash, be removed from the restricted account, an amount in excess of the outstanding principal balance of the Senior Secured Debenture.

On October 23, 2018, the Court entered an Opinion and Order, granting, in full, the Company's motion to dismiss JGB's amended complaint and allowing four of the Company's counterclaims to proceed to trial. Following the October 23 Opinion and Order of the Court, the parties to the JGB Action entered into a settlement agreement on November 5, 2018. The settlement agreement provides, among other things, that JGB will make a one-time payment to the Company of $6.6 million, inclusive of the $1.6 million excess amount removed from the restricted account. The entire settlement amount was recorded as an other receivable as of September 30, 2018 in the condensed consolidated balance sheet as of September 30, 2018 and the amount was received in November 2018. The Company offset approximately $2.5 million of legal fees incurred during the three months ended September 30, 2018 previously recorded in general and administrative expense in the condensed consolidated statement of operations with proceeds from the settlement and $2.5 million legal fees incurred subsequent to September 30, 2018 recorded as an accrued liability in the condensed consolidated balance sheet. The Company recognized a gain on extinguishment of debt of $0.8 million that was previously accrued in long-term debt for an additional interest payable at maturity as the amount is no longer payable by the Company. The settlement agreement also provides for the termination of the Senior Secured Debenture and all ancillary agreements, including the security agreement covering the Company's assets as well as a release of all security interests in the collateral.

17

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

9. Stockholders’ Equity

Preferred Stock

The Company has authorized up to 5,000,000 shares of preferred stock, $0.0001 par value per share, for issuance.

Series A Convertible Preferred

On March 7, 2018, the Company entered into a securities purchase agreement with investors, pursuant to which the Company agreed to sell to the investors, in a private placement pursuant to Rule 4(a)(2) and Regulation S under the Securities Act, an aggregate of 10,700 shares of the Company’s newly-created non-voting Series A Convertible Preferred, and warrants to acquire an aggregate 1,383,631 shares of the Company’s common stock, par value $0.0001 per share at an aggregate purchase price of $10.7 million. The Series A Convertible Preferred was initially convertible into 1,844,835 shares of common stock based on an initial conversion price of $5.80 per share.

At the first closing of the Series A Convertible Preferred on March 9, 2018, the Company issued an aggregate 5,987 shares of Series A Convertible Preferred and warrants to acquire 774,186 shares of common stock for aggregate gross proceeds of $6.0 million. The second closing of the remaining 4,713 shares of the Series A Convertible Preferred and warrants to acquire 609,445 shares of its common stock, for aggregate gross proceeds of $4.7 million, occurred on May 1, 2018 following receipt of stockholder approval.

In the event of a "qualified offering," as defined in the securities purchase agreement, holders of the Series A Convertible Preferred (the "Series A Holders"), had the right to exchange their shares of Series A Convertible Preferred for the same securities sold in a qualified offering on a $1.00 for $1.00 basis based on the stated value of their shares of Series A Convertible Preferred under the most favored nation provision. On July 16, 2018, following consummation of the July 2018 Offering, which was deemed a qualified offering as described below and also in Note 2 above, the Series A Holders exchanged an aggregate of $7,871,186 of stated valued and accrued but unpaid dividends on their Series A Convertible Preferred for an aggregate of 3,748,184 shares of the Company’s common stock and warrants to purchase an aggregate of 3,748,184 shares of the Company’s common stock. Following such exchange there are no shares of Series A Convertible Preferred issued and outstanding. The warrants have an exercise price of $2.10 per share and a term of five years. The fair value of the common stock and warrants to purchase shares of common stock exceeded the carrying amount of the Series A Preferred by $8.7 million and that amount is recorded as a deemed dividend in the condensed consolidated statements of operations during the three and nine months endedSeptember 30, 2018 as it represents a transfer of value from the common stockholders to the preferred investors. Since the Company does not have accumulated earnings, the deemed dividend is taken from additional paid-in capital. This one-time, non-cash charge impacted net loss attributable to common stockholders and loss per share for the three and nine months ended September 30, 2018.

In addition, pursuant to the terms of the warrants, the exercise price of the warrants issued to the investors in March 2018 and May 2018 was adjusted to $2.10 per share from the original exercise price of $6.59 per share. The Company recognized the $0.5 million increase to the fair value of the warrant liability as a result of the adjusted stock price as a deemed dividend in the condensed consolidated statements of operations during the three and nine months endedSeptember 30, 2018. This one-time, non-cash charge impacted net loss attributable to common stockholders and loss per share for the three and nine months ended September 30, 2018.

The Series A Convertible Preferred generally had no voting rights. However, for so long as any shares of Series A Convertible Preferred were outstanding, the affirmative vote of the holders of a majority of the then outstanding shares of the Series A Convertible Preferred was required to: (a) alter or change adversely the powers, preferences or rights given to the Series A Convertible Preferred or alter or amend the Certificate of Designation, (b) authorize or create any class of stock ranking as to dividends, redemption or distribution of assets upon a Liquidation (as defined in the Certificate of Designation) senior to, or otherwise pari passu with, the Series A Convertible Preferred, (c) amend the Company's certificate of incorporation or other charter documents in any manner that adversely affects any rights of the holders of Series A Convertible Preferred, (d) increase the number of authorized shares of Series A Convertible Preferred, or (e) enter into any agreement with respect to any of the foregoing.

18

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary that is not a Fundamental Transaction (as defined in the Certificate of Designation), the holders of Series A Convertible Preferred were entitled to receive from the Company's assets the same amount they would have received on an as converted basis, disregarding any conversion limitations. Such amounts would have been paid on apari passu basis with all holders of common stock.

The Company evaluated the Series A Convertible Preferred in accordance with the provisions of ASC 815, Derivatives and Hedging, including consideration of embedded derivatives requiring bifurcation. The issuance of the Series A Convertible Preferred could generate a beneficial conversion feature (“BCF”), which arises when a debt or equity security is issued with an embedded conversion option that is beneficial to the investor or in the money at inception because the conversion option has an effective conversion price that is less than the market price of the underlying stock at the commitment date. The Company recognized the BCF by allocating the intrinsic value of the conversion option, which is the number of shares of common stock available upon conversion multiplied by the difference between the effective conversion price per share and the fair value of common stock per share on the commitment date, to additional paid-in capital, resulting in a discount on the convertible preferred stock. As the Series A Convertible Preferred could have been converted immediately, the Company recognized a BCF of $2.0 million as a deemed dividend in the condensed consolidated statements of operations related to the first closing on March 9, 2018 and an additional BCF of $2.5 million as a deemed dividend related to the second closing on May 1, 2018. These one-time, non-cash charges impacted net loss attributable to common stockholders and loss per share for the nine months ended September 30, 2018.

Common Stock

The Company has authorized up to 350,000,000 shares of common stock, $0.0001 par value per share, for issuance.

On July 16, 2018, the Company closed the July 2018 Offering, issuing 6,845,000 shares of common stock and 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each accompanying common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other estimated offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

During its evaluation of equity classification for the pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock issued in the July 2018 Offering, the Company considered the conditions as prescribed within ASC 815-40, Derivatives and Hedging, Contracts in an Entity’s own Equity (“ASC 815-40”). The conditions within ASC 815-40 are not subject to a probability assessment. The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock do not fall under the liability criteria within ASC 480, Distinguishing Liabilities from Equity, as they are not puttable and do not represent an instrument that has a redeemable underlying security. The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock do meet the definition of a derivative instrument under ASC 815, but are eligible for the scope exception as they are indexed to the Company’s own stock and would be classified in permanent equity if freestanding.

19

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Shares of common stock for future issuance are reserved for as follows (in thousands):

	September 30, 2018
Warrants outstanding	19,224
Stock options outstanding	434
Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan	381
Shares reserved for future issuance under the Employee Stock Purchase Plan	115
Restricted stock units	13
Total reserved for future issuance	20,167

10. Warrants to Acquire Shares of Common Stock

The following is a summary of the Company's warrants to acquire shares of common stock activity for the nine months ended September 30, 2018 (in thousands):

Warrant Issuance	Outstanding, December 31, 2017	Granted	Exercised		Canceled/Expired		Outstanding, September 30, 2018	Expiration
July 2018 Offering	—	15,268	—		—		15,268	July 2023
Pre-funded July 2018 Offering	—	4,675	(2,525	)	—		2,150	July 2023
Series A Convertible Preferred	—	1,384	—				1,384	September 2023
2017 Equilibria	316	—	—				316	December 2022
Galena February 2017	567	—	—		(535	)	32	February 2022
Galena Other	80	—	—		(6	)	74	January 2022
	963	21,327	(2,525	)	(541	)	19,224

Warrants to acquire shares of common stock consist of warrants that may be settled in cash, which are liability-classified warrants, and equity-classified warrants. During the nine months ended September 30, 2018, a total of 534,333 of the Galena February 2017 liability-classified warrants to purchase shares of common stock were canceled under various warrant exchange agreements. The Company issued 54,613 shares of its common stock in exchange for the surrender and cancellation of warrants to acquire 121,667 shares of its common stock and $1.0 million in convertible promissory notes in exchange for the surrender and cancellation of warrants to acquire 412,667 shares of its common stock, as described in Note 7. The fair value of the common stock and promissory notes exchanged totaled $1.2 million, which exceeded the fair value of the warrant liability of the warrants canceled by $0.7 million and is recorded as loss on settlement of liability-classified warrants in the condensed consolidated statement of operations for the nine months ended September 30, 2018. In April 2018, $0.8 million of outstanding principal and accrued interest was converted into 118,644 shares of common stock.

Warrants Classified as Liabilities

Liability-classified warrants consist of warrants to acquire common stock issued in connection with previous equity financings for the Series A Convertible Preferred, Galena's February 2017 financing, and various other Galena equity financings that were assumed by the Company at the consummation of the Merger. These warrants may be settled in cash and were determined to not be indexed to the Company’s common stock.

20

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Prior to the consummation of the July 2018 Offering, the initial exercise price of the warrants to acquire shares of common stock in connection with the Series A Convertible Preferred was $6.59 per share of common stock, subject to standard adjustments for certain transactions affecting the Company’s securities (such as stock dividends, and stock splits). From the original issue date until the one-year anniversary of a qualified offering, the initial exercise price and number of warrants to acquire shares of common stock are subject to anti-dilution protection in the event of non-exempt equity issuances at a price per share lower than the then exercise price (the "Base Share Price"). Simultaneously with the consummation of each non-exempt equity issuance the exercise price shall be reduced to equal the Base Share Price. Such adjustment shall be made whenever such common stock or common stock equivalents are issued.

The estimated fair value of outstanding warrants accounted for as liabilities is determined at each balance sheet date. Any decrease or increase in the estimated fair value of the warrant liability since the most recent balance sheet date is recorded in the condensed consolidated statement of operations as change in fair value of warrant liability. The fair value of the warrants is estimated using a Black-Scholes pricing model with the following inputs:

As of September 30, 2018
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Series A Convertible Preferred	1,384	$	2.10	5.01	83.18	%	2.94	%
Galena February 2017	32	$	33.00	3.38	85.39	%	2.25	%
Galena Other	74	$	888.22	2.68	85.96	%	2.32	%
As of December 31, 2017
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Galena February 2017	567	$	13.00	4.12	79.29	%	2.09	%
Galena Other	80	$	28.40	3.19	74.05	%	2.09	%

The expected volatility assumptions are based on the Company's implied volatility in combination with the implied volatilities of similar publicly traded entities. The expected life assumption is based on the remaining contractual terms of the warrants. The risk-free rate is based on the zero coupon rates in effect at the time of valuation. The dividend yield used in the pricing model is zero, because the Company has no present intention to pay cash dividends.

The changes in fair value of the warrant liability for the nine months ended September 30, 2018 were as follows (in thousands):

Warrant Issuance	Warrant liability, December 31, 2017		Fair value of warrants granted		Fair value of warrants canceled			Adjustment to exercise price of warrants		Change in fair value of warrants			Warrant liability, September 30, 2018
Series A Convertible Preferred	$	—	$	5,039	$	—		$	491	$	(4,558	)	$	972
Galena February 2017	1,305		—		(524		)	—		(778		)	3
Galena Other	4		—		—			—		(4		)	—
	$	1,309	$	5,039	$	(524	)	$	491	$	(5,340	)	$	975

21

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Warrants Classified as Equity

The Company issued warrants to acquire 316,163 shares of the its common stock at an exercise price of $7.42 per share, maturing five years from issuance, to EQC Private Markets SAC Fund Ltd-EQC Biotech Sely I Fund on December 29, 2017. These warrants are recorded in equity at fair value upon issuance, and not as liabilities, and are not subject to adjustment to fair value in subsequent reporting periods. The fair value of the warrants granted was $5.60 per share using the Black-Scholes pricing model with the fair value assumptions for the grant including a volatility of 90.10%, expected term of five years, risk free rate of 2.20%, and a dividend rate of 0.00.

The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock issued during the July 2018 offering are recorded in equity upon issuance as described in Note 9.

11. Stock-Based Compensation

Share and per share amounts below have been retroactively adjusted to reflect the exchange ratio and reverse stock split as described in Note 1.

2017 Equity Incentive Plan

On December 29, 2017, the 2017 Equity Incentive Plan was approved, and currently allows for the issuance of up to a maximum of approximately 575,000 shares of common stock in connection with the grant of stock-based awards, including stock options, restricted stock, restricted stock units, stock appreciation rights and other types of awards as deemed appropriate, not including shares subject to awards assumed in connection with certain transactions, including the Merger. Upon the consummation of the Merger, the Company assumed approximately 10,171 shares subject to outstanding common stock options granted under the Company’s 2016 Incentive Plan that will remain exercisable through December 29, 2018 for former Company employees and directors.

The number of shares reserved for issuance under the 2017 Equity Incentive Plan will automatically increase on January 1 of each year, for a period of not more than ten years, commencing on January 1 of the year following the year in which the effective date occurs and ending on (and including) January 1, 2027, in an amount equal to 4% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year. Notwithstanding the foregoing, the board of directors may act prior to January 1 of a given year to provide that there will be no January 1 increase in the share reserve for such year or that the increase in the share reserve for such year will be a lesser number of shares of common stock than would otherwise occur pursuant to the preceding sentence. The number of shares reserved for issuance under the 2017 Equity Incentive Plan was automatically increased to approximately 805,000 on January 1, 2018. As of September 30, 2018, an aggregate of approximately 381,000 shares of common stock were reserved for future grants under the Company’s 2017 Equity Incentive Plan. There were no common stock options granted under the 2017 Equity Incentive Plan for the year ended December 31, 2017.

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	21	$	543	$	55	$	729
General and administrative	115		724		229		3,047
Total stock-based compensation	$	136	$	1,267	$	284	$	3,776

22

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

Options to Purchase Shares of Common Stock

The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the fair value of all its stock options granted during the nine months ended September 30, 2018:

	Nine Months Ended September 30, 2018
Risk free interest rate	2.73	%
Volatility	80.83	%
Expected lives (years)	6.20
Expected dividend yield	—	%

The weighted-average grant date fair value of options granted during the nine months ended September 30, 2018 was $3.73. There were no stock options granted during the three months ended September 30, 2018 and the nine months ended September 30, 2017.

The Company’s expected common stock price volatility assumption is based upon the Company's own implied volatility in combination with the implied volatility of a basket of comparable companies. The expected life assumptions for employee grants were based upon the simplified method, which averages the contractual term of the Company’s options of ten years with the average vesting term of four years for an average of six years. The expected life assumptions for non-employees were based upon the contractual term of the option. The dividend yield assumption is zero, because the Company has never paid cash dividends and presently has no intention to do so. The risk-free interest rate used for each grant was also based upon prevailing short-term interest rates. The Company accounts for forfeitures as they occur.

As of September 30, 2018, there was $1.2 million of unrecognized compensation cost related to outstanding stock options that is expected to be recognized as a component of the Company’s operating expenses over a weighted-average period of 2.46 years.

The following table summarizes stock option activity of the Company for the nine months ended September 30, 2018:

	Total Number of Shares (In Thousands)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2018	10		$	1,240.55	1.00	$	—
Granted	483		5.24			—
Canceled	(59	)	5.24			$	—
Outstanding at September 30, 2018	434		$	34.17	9.26	$	—
Options exercisable at September 30, 2018	43		$	265.35	7.51	$	—

The aggregate intrinsic values of outstanding and exercisable stock options at September 30, 2018 were calculated based on the closing price of the Company’s common stock as reported on the Nasdaq Capital Market on September 30, 2018 of $1.22 per share. The aggregate intrinsic value equals the positive difference between the closing fair market value of the Company’s common stock and the exercise price of the underlying stock options.

23

SELLAS LIFE SCIENCES GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

RSUs with Time-Based and Performance-Based Conditions

The Company granted RSUs subject to both time-based and performance-based vesting conditions to certain of its employees and non-employees pursuant to the 2016 Incentive Plan. These RSUs vest based on both (i) continued service either over a three-year measurement period or at the end of the required service period and (ii) the achievement of a liquidity event. The initial vesting date for these RSUs was February 27, 2018. The liquidity event, as defined in the relevant RSU grant agreements, will be satisfied upon the earlier of either: (a) change of control or (b) a qualified public offering. As of September 30, 2018 and December 31, 2017, there were approximately 13,000 RSUs outstanding with a weighted average grant date fair value of $52.94.

The Company recognizes compensation expense related to these RSUs when the liquidity event is deemed probable. As such, no compensation expense was recorded to date as the liquidity event is outside the Company’s control and not deemed probable until it occurs.

12. Subsequent Events

The Company evaluated all events or transactions that occurred after September 30, 2018 up through the date these financial statements were issued. Other than as disclosed elsewhere in the notes to the condensed consolidated financial statements, the Company did not have any material subsequent events.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This management’s discussion and analysis of financial condition as of September 30, 2018 and results of operations for the three and nine months ended September 30, 2018 and 2017, respectively, should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations included in the 2017 Annual Report, and our other public reports filed with the SEC.

Merger of Galena Biopharma, Inc. and SELLAS Life Sciences Group Ltd.

On December 29, 2017, we completed the business combination with the privately held Bermuda exempted company, SELLAS Life Sciences Group Ltd., or Private SELLAS, in accordance with the terms of the Agreement and Plan of Merger and Reorganization, dated as of August 7, 2017 and amended November 5, 2017, or the Merger Agreement, among the Company, Sellas Intermediate Holdings I, Inc., Sellas Intermediate Holdings II, Inc., Galena Bermuda Merger Sub, Ltd., and Private SELLAS. We refer to this business combination throughout this quarterly report on Form 10-Q as the Merger. As a result of the Merger, our business is now substantially comprised of the business of Private SELLAS, and although we are considered the legal acquiror of Private SELLAS, for accounting purposes, Private SELLAS is considered to have acquired our Company in the Merger. Consequently, the Merger was accounted for as a reverse acquisition and the Private SELLAS financial statements became our financial statements.

Immediately prior to the Merger, we effected a 1-for-30 reverse stock split of our outstanding common stock, par value $0.0001 per share. Under the terms of the Merger Agreement, we issued shares of our common stock to Private SELLAS’ securityholders at an exchange ratio of 43.9972 shares of our common stock in exchange for each common share of Private SELLAS outstanding immediately prior to the Merger. We also assumed all of the restricted stock units, or RSUs, issued and outstanding under the Private SELLAS Stock Incentive Plan #1, and all of the issued and outstanding warrants of Private SELLAS. Accordingly, such RSUs will now be settled in, and such warrants now are exercisable for, shares of our common stock. Accordingly, immediately after the Merger, there were 5,766,891 shares of our common stock outstanding, with the former Private SELLAS securityholders owning 67.5% of our fully diluted common stock, and our pre-Merger securityholders owning the remaining 32.5%.

Upon completion of the Merger, we changed our name from “Galena Biopharma, Inc.” to “SELLAS Life Sciences Group, Inc.,” our financial statements became those of Private SELLAS and our common stock began trading on The Nasdaq Capital Market under a new ticker symbol “SLS” on January 2, 2018 and our financial statements became those of Private SELLAS.

As used in this quarterly report on Form 10-Q, the words “we,” “us,” “our,” the “Company,” and “SELLAS” refer to SELLAS Life Sciences Group, Inc. and our consolidated subsidiaries following completion of the Merger.

Overview

We are a late-stage biopharmaceutical company focused on the development and commercialization of novel cancer immunotherapeutics for a broad range of indications. Our lead product candidate, galinpepimut-S, or GPS, is an immunotherapeutic agent licensed from Memorial Sloan Kettering Cancer Center, or MSK, which targets the Wilms tumor 1, or WT1, protein. WT1 has been shown to be present in 20 or more cancer types and is one of the most commonly expressed cancer antigens. GPS has been engineered to incorporate novel technology to preserve WT1 antigenicity and overcome the tolerance the immune system commonly develops to tumor antigens, a major challenge in the development of effective immunotherapies for cancer. Based on its mechanism of action as a direct immunizing agent, GPS has potential as a monotherapy or in combination with other immunotherapeutic agents to address a broad spectrum of hematological malignancies and solid tumor indications.

25

Phase 2 clinical trials for GPS in two potential indications, acute myeloid leukemia, or AML, and malignant pleural mesothelioma, or MPM, are completed. We have planned Phase 3 clinical trials (pending funding availability) evaluating GPS as monotherapy for these two indications with AML being our priority. GPS is also in early clinical development as a potential treatment for multiple myeloma, or MM, and epithelial ovarian cancer. We also plan to study GPS in up to four additional indications: as a combination therapy in small cell lung cancer, colorectal cancer, triple-negative breast cancer, or TNBC; and, as a monotherapy in chronic myelogenous leukemia, or CML. We received Orphan Drug Product designations from the U.S. Food and Drug Administration, or FDA, as well as Orphan Medicinal Product designations from the European Medicines Agency, or EMA, for GPS for AML, MPM and MM, and Fast Track designation for AML, MPM, and MM from the FDA.

Our pipeline also includes the ongoing development programs of our predecessor company, including novel cancer immunotherapy programs for nelipepimut-S (NeuVax^TM or NPS; a vaccine against the E75 peptide derived from the human epidermal growth factor 2, or HER2, protein), GALE-301 (a vaccine against the E39 peptide derived from the folate binding protein, or FBP), GALE-302 (a vaccine against the J65 peptide derived from FBP) and GALE-401 (a controlled release version of the approved drug anagrelide). NPS is currently in multiple investigator-sponsored Phase 2 clinical trials in breast cancer.

On April 2, 2018, we announced that a pre-specified interim analysis of safety and efficacy, conducted by an independent Data Safety Monitoring Board, or DSMB, for the investigator sponsored Phase 2b NPS + trastuzumab study demonstrated a clinically meaningful difference in median disease-free survival, or DFS, in favor of the active arm, a primary endpoint of the study. The interim analysis further demonstrated a statistically significant and clinically meaningful improvement in DFS among a cohort of patients with triple negative breast cancer, or TNBC, associated with the NPS + trastuzumab combination. Patients in the TNBC cohort were defined as harboring tumors that were hormone receptor-negative and had low expression (IHC 1+/2+) of HER2. Based on these results, and the DSMB’s recommendation, we plan to expeditiously seek regulatory guidance by the FDA for further development of NPS + trastuzumab combination therapy in TNBC, a population of breast cancer patients with large unmet need. In June 2018, we announced that the sponsor-principal investigator of this study, after taking into account that key clinical development objectives were met as well as other regulatory considerations, and with our agreement, determined to terminate the study early. In addition, in late May 2018, we conducted two advisory meetings with global experts in regulatory affairs and breast cancer clinical development in order to determine the optimal path for further development of the NPS + trastuzumab combination in TNBC in a pivotal setting and for engagement with the FDA and EMA. Moreover, on October 22, 2018, we announced that the final analysis of data from the Phase 2b NPS + trastuzumab study for the TNBC cohort confirmed the previously reported positive data (from the interim analysis), and further strengthened the evidence for a statistically significant and clinically positive outcome with the combination. This data was presented at the European Society for Medical Oncology (ESMO) 2018 Annual Meeting. GALE-301 and GALE-302, our E39 folate binding peptide vaccine product candidates, have completed early stage trials in ovarian, endometrial and breast cancers. Both candidates have received Orphan Drug Product designation by the FDA.

Recent Developments

On July 16, 2018, we consummated an underwritten public offering of 6,845,000 shares of common stock, 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. At closing, we received aggregate net proceeds from the offering of approximately $21.6 million, after deducting underwriting discounts and commissions and estimated offering expenses.

Following the consummation of the underwritten public offering, pursuant to Section 4.17 of the March 2018 securities purchase agreement, on July 16, 2018, the holders of our Series A Convertible Preferred exchanged an aggregate of $7,871,186 of stated valued and accrued but unpaid dividends on their Series A Convertible Preferred for an aggregate of 3,748,184 shares of our common stock and warrants to purchase an aggregate of 3,748,184 shares of our common stock, and there are no longer any shares of Series A Convertible Preferred issued and outstanding. The warrants have an exercise price of $2.10 per share and a term of five years. In addition, pursuant to their terms, the exercise price of the warrants was adjusted to $2.10 per share from the original exercise price of $6.59 per share.

26

On November 5, 2018, we announced that we have agreed to a settlement with JGB (Cayman) Newton, Ltd., or JGB, regarding our counterclaims against JGB that were asserted in the litigation originally commenced by JGB. As part of the settlement, JGB paid us approximately $6.6 million in exchange for a full discharge of all counterclaims asserted by us against JGB in the litigation. We and JGB have also agreed to terminate the senior secured debenture agreement and all related agreements, with JGB releasing all of its interests in the collateral for the senior secured debenture. See Note 8 to the condensed consolidated financial statements for a description of the litigation and settlement agreement.

Components of Results of Operations

Research and Development

Research and development expenses consist of expenses incurred in connection with the discovery and development of our product candidates. We expense research and development costs as incurred. These expenses primarily include expenses incurred under agreements with contract research organizations, as well as investigative sites and consultants that conduct our preclinical studies and clinical trials, manufacturing expenses, outsourced professional scientific development services, employee-related expenses, which include salaries, benefits and stock-based compensation, expenses relating to regulatory activities, including filing fees paid to regulatory agencies, laboratory materials and supplies used to support our research activities; and allocated expenses, utilities and other facility-related costs.

The successful development of our current and future product candidates is highly uncertain. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the remainder of the development of, or when, if ever, material net cash inflows may commence from any current or future product candidates. This uncertainty is due to the numerous risks and uncertainties associated with the duration and cost of clinical trials, which vary significantly over the life of a project as a result of many factors, including the number of clinical sites included in the trials, the length of time required to enroll suitable patients, the number of patients that ultimately participate in the trials, the number of doses patients receive, the duration of patient follow-up, the results of our clinical trials, the expenses associated with manufacturing, the receipt of marketing approvals, and the commercialization of current and future product candidates.

Our expenditures are subject to additional uncertainties, including the terms and timing of regulatory approvals. We may never succeed in achieving regulatory approval for any of our current or future product candidates. We may obtain unexpected results from our clinical trials. We may elect to discontinue, delay or modify clinical trials of some product candidates or target indications or focus on others. A change in the outcome of any of these variables with respect to the development of a product candidate could mean a significant change in the costs and timing associated with the development of that product candidate. 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. Cancer immunotherapy product commercialization may take several years and millions of dollars in development costs.

Research and development activities are central to our business model. Cancer immunotherapy product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. We expect our research and development expenses to increase significantly over the next several years as we add personnel which will increase costs, including stock-based compensation, conduct clinical trials and prepare regulatory filings for our product candidates.

27

General and Administrative

General and administrative expenses consist principally of salaries and related costs for personnel in executive, administrative, finance and legal functions, including stock-based compensation, travel expenses and recruiting expenses. Other general and administrative expenses include facility related costs, patent filing and prosecution costs, professional fees for business development, legal, auditing and tax services and insurance costs.

We anticipate that our general and administrative expenses will increase as a result of increased payroll, expanded infrastructure and an increase in accounting, consulting, legal and tax-related services associated with maintaining compliance with stock exchange listing and SEC requirements, investor relations costs, and director and officer insurance premiums associated with being a public company. We also anticipate that our general and administrative expenses will increase in support of our clinical trials as we expand and progress our development programs.

Non-Operating Income (Expense), Net

Non-operating income (expense), net consists of change in fair value of our warrant liability, change in fair value of our contingent consideration, loss on settlement of liability-classified warrants, and interest expense, net. Interest expense, net primarily reflects interest expense incurred on our convertible term notes and other loans held with current and former stockholders, offset by the interest earned from our cash and cash equivalents.

28

Results of Operations for the Three and Nine Months Ended September 30, 2018 and 2017

The following table summarizes our results of operations for the three and nine months ended September 30, 2018 and 2017:

(dollars in thousands)	Three Months Ended September 30,
	2018			2017			Change
Operating expenses:
Research and development	$	1,720		$	1,068		$	652
General and administrative	1,341			3,222			(1,881		)
Total operating expenses and operating loss	(3,061		)	(4,290		)	(1,229		)
Non-operating income (expense)	2,771			(102		)	(2,873		)
Loss before income taxes	(290		)	(4,392		)	(4,102		)
Income tax expense	—			63			(63		)
Net loss	$	(290	)	$	(4,455	)	$	4,165

For the three months ended September 30, 2018, our net loss was $0.3 million compared to a net loss of $4.5 million for the three months ended September 30, 2017. The decrease of $4.2 million in net loss was primarily attributable to a decrease in operating loss of $1.2 million and an increase in non-operating income (expense) of $2.9 million.

(dollars in thousands)	Nine Months Ended September 30,
	2018			2017			Change
Operating expenses:
Research and development	$	5,116		$	5,079		$	37
General and administrative	10,130			9,350			780
Total operating expenses and operating loss	(15,246		)	(14,429		)	817
Non-operating income (expense)	1,062			(360		)	(1,422		)
Loss before income taxes	(14,184		)	(14,789		)	(605		)
Income tax expense	163			180			(17		)
Net loss	$	(14,347	)	$	(14,969	)	$	(588	)

For the nine months ended September 30, 2018, our net loss was $14.3 million compared with a net loss of $15.0 million for the nine months ended September 30, 2017. The decrease of $0.6 million in net loss was primarily attributable to an increase in non-operating income (expense) of $1.4 million partially offset by an increase in operating loss of $0.8 million.

Further analysis of the changes and trends in our operating results are discussed below.

Research and Development

Research and development expenses were $1.7 million for the three months ended September 30, 2018 compared to $1.1 million for the three months ended September 30, 2017. The $0.7 million increase was primarily attributable to a $0.4 million increase in outsourced clinical and regulatory consulting and a $0.5 million increase in clinical expenses driven by startup costs incurred related to the Phase 1/2 basket trial of GPS in combination with pembrolizumab (Keytruda^®)in multiple tumor types during the third quarter of 2018 and ongoing costs incurred related to the Phase 2b trial of NPS in combination with trastuzumab. In addition, licensing fees increased $0.3 million due to our expanded clinical portfolio as a result of the Merger. These increases were partially offset by a reduction of $0.5 million in stock-based compensation. We anticipate that our research and development expenses will increase in the remainder of 2018 as we continue to advance our product candidates into and through clinical trials.

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Research and development expenses were $5.1 million for the nine months ended September 30, 2018 compared to $5.1 million for the nine months ended September 30, 2017. As compared to the prior period, research and development expenses experienced a $0.7 million increase in clinical and regulatory consulting and a $0.3 million increase in clinical expenses driven by driven by startup costs incurred related to the Phase 1/2 basket trial of GPS in combination with pembrolizumab (Keytruda^®)in multiple tumor types during the third quarter of 2018 and ongoing costs incurred related to the Phase 2b trial of NPS in combination with trastuzumab. In addition, personnel related expenses during the period increased $0.3 million due to a one-time severance charge. These increases were partially offset by a $0.7 million decrease in stock-based compensation expense, a $0.3 million decrease in licensing fees due to the timing of milestone payments, and a $0.3 million decrease in manufacturing expenses. We anticipate that our research and development expenses will increase in the remainder of 2018 as we continue to advance our product candidates into and through clinical trials.

General and Administrative

General and administrative expenses were $1.3 million for the three months ended September 30, 2018 compared to $3.2 million for the three months ended September 30, 2017. The $1.9 million decrease was primarily driven by a $2.0 million decrease in legal fees, a $0.6 million decrease in stock-based compensation, and a $0.2 million decrease in accounting and audit fees. These decreases were partially offset by an increase of $0.4 million in personnel related expenses, a $0.3 million increase in insurance premiums, and a $0.2 million increase in other expenses. The reduction in legal fees during the three months ended September 30, 2018 was primarily attributable to the settlement of the JGB litigation in November 2018 as described in Note 8 to the condensed consolidated financial statements. We recorded legal fee reimbursements totaling $2.5 million through September 30, 2018 related to the settlement with JGB. In addition, we received reimbursement for legal fees of $0.5 million from our insurance carrier for previous amounts paid in excess of our deductible related to the Patel litigation described in Note 8 to the condensed consolidated financial statements. These amounts were recorded as a reduction of our general and administrative expenses for the three months ended September 30, 2018.

General and administrative expenses were $10.1 million for the nine months ended September 30, 2018 compared to $9.4 million for the nine months ended September 30, 2017. The $0.8 million increase was primarily driven by a $0.9 million increase in outside services and public company costs, a $0.9 million increase in insurance premiums, a $0.7 million increase in personnel related expenses, a $0.4 million increase in accounting and audit fees and $0.7 million in other expenses. These increases were partially offset by a $2.8 million decrease in stock-based compensation expense. Overall, general and administrative expenses increased during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017, as a result of an increase in accounting, consulting, and tax-related services associated with maintaining compliance with listing and SEC requirements, investor relations costs, and director and officer insurance premiums associated with being a public company.

Non-Operating Income (Expense), Net

Non-operating income (expense), net for the three and nine months ended September 30, 2018 and 2017, respectively, was as follows (dollars in thousands):

	Three Months Ended September 30,									Nine Months Ended September 30,
	2018			2017			Change			2018			2017			Change
Change in fair value of warrant liability	$	2,241		$	—		$	2,241		$	5,340		$	—		$	5,340
Change in fair value of the contingent consideration	(162		)	—			(162		)	(4,025		)	—			(4,025		)
Loss on settlement of liability-classified warrants	—			—			—			(727		)	—			(727		)
Gain on extinguishment of debt	766			—			766			766			—			766
Interest expense, net	(74		)	(102		)	28			(292		)	(360		)	68
Total non-operating income (expense), net	$	2,771		$	(102	)	$	2,873		$	1,062		$	(360	)	$	1,422

30

The increase in our net non-operating income during the three months ended September 30, 2018 compared to the three months ended September 30, 2017 was primarily due to a $2.2 million gain arising from the decrease in the fair value of liability-classified warrants to acquire shares of common stock and a $0.8 million gain on extinguishment of debt partially offset by a $0.2 million increase in the fair value of the contingent consideration liability. The increase in our net non-operating income during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017 was primarily due to a $5.3 million gain arising from the decrease in the fair value of liability-classified warrants to acquire shares of common stock and a $0.8 million gain on extinguishment of debt partially offset by a $4.0 million increase in the fair value of the contingent consideration liability. The decrease in the estimated fair value of our warrant liability was primarily due to the decrease in our common stock price. The change in the estimated fair value of the contingent consideration during the three and nine months endedSeptember 30, 2018 reflects an adjusted probability and time line for the potential approval of NPS associated with the positive interim data from the prospective, randomized, single-blinded, controlled Phase 2b investigator-sponsored clinical trial of trastuzumab +/- NPS in HER2 1+/2+ breast cancer patients in the adjuvant setting to prevent recurrences that was announced on April 2, 2018.

The $0.8 million gain on extinguishment of debt relates to the settlement with JGB, the holder of our former senior secured debenture. As disclosed in the Overview and elsewhere in this quarterly report on Form 10-Q, we were involved in litigation with JGB regarding the senior secured debenture, and entered into a settlement agreement in November 2018. As a result of the settlement, the $0.8 million of additional interest that was due at maturity was forgiven. See Note 8 to the condensed consolidated financial statements for a description of the litigation and settlement agreement.

The $0.7 million loss on settlement of liability-classified warrants relates to warrants to acquire shares of common stock issued by Galena in February 2017 that were assumed in the Merger. During the nine months endedSeptember 30, 2018, a total of 534,333 of the Galena February 2017 liability-classified warrants to acquire shares of common stock were canceled under various warrant exchange agreements. We issued 54,343 shares of our common stock in exchange for the surrender and cancellation of warrants to acquire 121,667 shares of our common stock and $1.0 million in convertible promissory notes in exchange for the surrender and cancellation of warrants to acquire 412,667 shares of our common stock, as described in Note 7 to the condensed consolidated financial statements. The fair value of the consideration exchanged totaling $1.3 million exceeded the fair value of the warrant liability of the warrants canceled by $0.7 million and is recorded as loss on settlement of liability-classified warrants in the condensed consolidated statement of operations for the nine months endedSeptember 30, 2018.

Interest expense, net for the three and nine months ended September 30, 2018 and 2017 primarily consists of interest expense incurred on our long-term debt, partially offset by nominal interest earned from our cash and cash equivalents.

The change in fair value of warrant liability, change in fair value of contingent consideration, loss on settlement of liability-classified warrants, and gain on extinguishment of debt are all non-cash in nature.

Income Tax Expense

For the nine months ended September 30, 2018 and 2017, we recognized income tax expense of $0.2 million and for the three months ended September 30, 2017 we recognized $0.1 million of income tax expense. We continue to maintain a full valuation allowance against our net deferred tax assets.

31

Liquidity and Capital Resources

We have not generated any revenue from product sales or collaboration and licensing agreements in the nine months ended September 30, 2018 and 2017. Since inception, we have incurred net losses, used net cash from our operations, and have funded substantially all of our operations through proceeds of private placements and convertible notes.

On July 16, 2018, we closed an underwritten public offering, or the July 2018 Offering, issuing 6,845,000 shares of common stock and 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and accompanying common stock warrant. Each common stock warrant sold with the shares of common stock represents the right to purchase one share of our common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to us from the July 2018 Offering, after deducting the underwriting discounts and commissions and other estimated offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

On March 7, 2018, we entered into a definitive securities purchase agreement to issue an aggregate of 10,700 shares of Series A Convertible Preferred, and warrants to acquire 1,383,631 shares of our common stock in a private placement transaction to a select group of institutional investors. The sale of the Series A Convertible Preferred closed in two tranches and resulted in aggregate gross proceeds to us of approximately $10.7 million. We closed the first tranche for approximately $6.0 million gross proceeds on March 9, 2018. We closed the second tranche of the remaining $4.7 million gross proceeds on May 1, 2018, following the receipt of necessary stockholder approval.

In addition, in the first half of 2018, JGB redeemed $2.8 million of outstanding principal that was satisfied with 659,529 shares of our common stock and redeemed $0.6 million of outstanding principal, which we satisfied in cash. As a result of the redemptions, we transferred $1.8 million out of restricted cash and cash equivalents and into unrestricted cash and cash equivalents to be used to fund our ongoing operations. Pursuant to the terms of the settlement agreement in the JGB Action, as described in Note 8 to the condensed consolidated financial statements, JGB made a one-time payment to the Company of $6.6 million in November 2018. We recorded the entire settlement amount as an other receivable as of September 30, 2018 in the condensed consolidated balance sheet as of September 30, 2018 and received the amount in November 2018.

As of September 30, 2018, we had an accumulated deficit of $68.5 million, cash and cash equivalents of $10.0 million, and restricted cash and cash equivalents of $0.1 million. We also received $6.6 million in November 2018 pursuant to the settlement agreement with JGB and $0.5 million in litigation insurance recovery in October 2018. In addition, we had accounts payable and accrued expenses and other current liabilities of $11.9 million and indebtedness of $0.1 million as of September 30, 2018. Our outstanding indebtedness consists of $0.1 million in promissory notes. These matters raise substantial doubt about our ability to continue as a going concern. Our condensed consolidated financial statements do not include any adjustments related to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. We anticipate incurring additional losses until such time, if ever, that we can generate significant sales of any current or future product candidates in development.

32

This going concern assumption is based on management’s assessment of the sufficiency of our current and future sources of liquidity considering whether or not it is probable we will be able to meet our obligations as they become due for at least one year from the date our condensed consolidated financial statements are available to be issued, and if not, whether our liquidation is imminent. Our management believes that our cash of $10.0 million as of September 30, 2018, including amounts received in October and November 2018, will enable us to fund our operating expenses and capital expenditure requirements through March 2019. We will require substantial additional financing to fund our operations thereafter and to commercially develop any current or future product candidates. Alternatively, we will be required to scale back our plans and place certain activities on hold. We currently do not have any commitments to obtain additional funds and may be unable to obtain sufficient funding in the future on acceptable terms, if at all. However, our management is currently evaluating different strategies to obtain the required funding for future operations. These strategies may include public and private placements of equity and/or debt securities, payments from potential strategic research and development collaborations, and licensing and/or marketing arrangements with pharmaceutical companies. Additionally, we continue to engage in active discussions with global and regional pharmaceutical companies for licensing and/or co-development rights to our late- and early-stage pipeline candidates. There can be no assurance that these future funding efforts will be successful. If we cannot obtain the necessary funding, we will need to delay, scale back or eliminate some or all of our research and development programs; consider other various strategic alternatives, including a merger or sale; or cease operations. However, at this stage our management does not believe liquidation is imminent.

Our future operations are highly dependent on a combination of factors, including (i) the timely and successful completion of additional financing discussed above, (ii) our ability to complete revenue-generating partnerships with pharmaceutical companies, (iii) the success of our research and development activities, (iv) the development of competitive therapies by other biotechnology and pharmaceutical companies, and, ultimately, (v) regulatory approval and market acceptance of our proposed future products.

Cash Flows

The following table summarizes our cash flows from operating, investing, and financing activities for the nine months ended September 30, 2018 and 2017 (amounts in thousands):

	For the Nine Months Ended September 30,
	2018			2017
Net cash (used in) provided by:
Operating activities	(25,867		)	(9,247		)
Financing activities	23,199			5,654
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents	$	(2,668	)	$	(3,593	)

Net Cash Flow from Operating Activities

Net cash used in operating activities of $25.9 million during the nine months endedSeptember 30, 2018 was primarily attributable to our net loss of $14.3 million. This amount was offset by various net non-cash charges of $0.4 million, which was comprised of $4.0 million increase in the fair value of our contingent consideration liability, $1.3 million increase in the fair value of common stock issued in connection with litigation settlements, and $0.7 million loss on settlement of liability-classified warrants, partially offset by a gain of $5.3 million from the decrease in the fair value of liability-classified warrants and a $0.8 million gain on extinguishment of debt. The net change in our operating assets and liabilities of $11.9 million is primarily attributable to an increase in other receivables of $6.6 million related to the settlement with JGB that was received in November 2018 and a decrease in our accounts payable and accrued expenses.

33

Net cash used in operating activities was $9.2 million for the nine months endedSeptember 30, 2017, which was primarily attributable to our net loss of $15.0 million. This amount was offset by $3.8 million in non-cash stock-based compensation, $0.6 million on the loss on extinguishment of accounts payable satisfied with shares of common stock, and $0.3 million of services paid with shares of common stock.

Net Cash Flow from Financing Activities

We generated $23.2 million of net cash from financing activities for the nine months endedSeptember 30, 2018, which was primarily attributable to $21.6 million in net proceeds from the sale of common stock and common stock warrants, $9.6 million in net proceeds from the sale of the Series A Convertible Preferred and warrants, partially offset by $7.5 million in principal payments on our previously outstanding Senior Secured Debenture. We generated $5.7 million of net cash from financing activities for the nine months endedSeptember 30, 2017, which was primarily attributable to $6.0 million in net proceeds from the sale of shares of our common stock, partially offset by $0.3 million in principal payments on long-term debt.

Off-Balance Sheet Arrangements

We have not entered into any off-balance sheet financing arrangements other than operating leases as of September 30, 2018.

Critical Accounting Policies and Estimates

In the 2017 Annual Report, we disclosed our critical accounting policies and estimates upon which our financial statements are derived. There have been no material changes to these policies since December 31, 2017 that are not included in Note 3 of the accompanying condensed consolidated financial statements for the three and nine months endedSeptember 30, 2018. Readers are encouraged to read the 2017 Annual Report in conjunction with this quarterly report.

 ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

Not applicable.

34

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on the evaluation of our disclosure controls and procedures (as defined in the Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act) required by Exchange Act Rules 13a-15(b) or 15d-15(b), our principal executive officer and our principal financial officer have concluded that as of the end of the period covered by this report, our disclosure controls and procedures were not effective as a result of the material weakness in our internal control over financial reporting discussed below.

Material Weakness and Remediation Plan

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 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 2017 consolidated financial statements, we were informed by our independent registered public accounting firm that we had a material weakness in our internal control over financial reporting due to our lack of sufficient management and personnel with appropriate expertise in GAAP and SEC rules and regulations with respect to financial reporting during the year ended December 31, 2017. At that time, we had only one designated finance and accounting employee and relied primarily on consultants to provide many accounting, book-keeping, and administrative services. This reflects the fact that prior to the Merger, Private SELLAS was a small privately-held company, and that in connection with the Merger, Private SELLAS historical operations, and not that of the predecessor company, represent virtually the entirety of the combined business. In addition, following the Merger, which occurred on December 29, 2017, our accounting and financial systems, as well as personnel, were replaced by those of Private SELLAS,

In order to remedy these material weaknesses, during the nine months ended September 30, 2018, we hired three additional finance and accounting personnel, including a Chief Financial Officer, to build out our financial reporting team and further develop and document accounting policies and procedures. Additionally, during the first quarter of 2018, we engaged a consulting firm to assist us in evaluating the design of our internal control over financial reporting, including disclosure controls and procedures. Our goal is to remediate this material weakness as soon as practical as part of our plan to implement and mature our system of internal control over financial reporting. We expect to complete our remediation of the material weakness by December 31, 2018.

Changes in Internal Control over Financial Reporting

Other than the remedial activities described above, there has been no change in our internal control over financial reporting (as defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarter ended September 30, 2018 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

35

PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Please refer to Note 8 (Legal Proceedings, Commitments and Contingencies) to our condensed consolidated financial statements contained in Part I, Item 1 (Financial Statements) of this quarterly report on Form 10-Q, which is incorporated into this item by reference.

ITEM 1A. RISK FACTORS

Please refer to our note on forward-looking statements on page 2 of this quarterly report on Form 10-Q, which is incorporated into this item by reference.

In addition to the other information set forth in this report, you should carefully consider the risk factors discussed in Exhibit 99.1 in our Current Report on Form 8-K dated July 18, 2018, which could materially affect our business, financial condition or future results. The risks described in such Current Report on Form 8-K are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition, operating results and stock price.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. Mine Safety Disclosures

Not applicable.

ITEM 5. Other Information

None.

36

ITEM 6. EXHIBITS

Exhibit #	Description	Form	Exhibit	Filing Date
3.1	Composite Amended and Restated Certificate of Incorporation of the Registrant (formerly, Galena Biopharma, Inc.) amended as of December 27, 2017	10-K	3.1	April 13, 2018
3.2	Amended and Restated By-Laws of the Registrant	8-K	3.3	January 5, 2018
10.1	Underwriting Agreement dated July 12, 2018 between the Registrant and Cantor Fitzgerald & Co. and Oppenheimer & Co. Inc.	8-K	1.1	July 18, 2018
10.2	Warrant Agreement including form of accompanying Common Warrant as Exhibit B thereto, dated as of July 16, 2018, among the Registrant, Computershare, Inc., and Computershare Trust Company N.A.	8-K	10.1	July 18, 2018
10.3	Form of Pre-funded Warrant	8-K	10.2	July 18, 2018
10.4	Form of Warrant issued in exchange of Series A Preferred Stock	8-K	10.3	July 18, 2018
10.5	Settlement Agreement between SELLAS Life Sciences Group, Inc. and individual named defendants, on the one hand, and JGB (Cayman) Newton, Ltd., JGB Collateral LLC, JGB Capital Offshore Ltd., JGB Partners L.P., and JGB Capital L.P., on the other hand, dated as of November 5, 2018.	8-K	10.1	November 9, 2018
31.1	Certification of Principal Executive Officer pursuant to Rule13a-14(a) and Rule 15d-14(a) of the Securities and Exchange Act, as amended.*
31.2	Certification of Principal Financial Officer pursuant to Rule13a-14(a) and Rule 15d-14(a) of the Securities and Exchange Act, as amended.*
32.1	Certification of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. **
101.INS	XBRL Instance Document.*
101.SCH	XBRL Taxonomy Extension Schema.*
101.CAL	XBRL Taxonomy Extension Calculation Linkbase.*
101.DEF	XBRL Taxonomy Extension Definition Linkbase.*
101.LAB	XBRL Taxonomy Extension Label Linkbase.*
101.PRE	XBRL Taxonomy Extension Presentation Linkbase.*

*

Filed herewith

**

The certification attached as Exhibit 32.1 accompany this quarterly report on Form 10-Q pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not be deemed “filed” by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference into any filing of the registrant under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

37

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.

SELLAS Life Sciences Group, Inc.
By:	/s/ Angelos M. Stergiou
	Angelos M. Stergiou, MD, ScD h.c.
	President and Chief Executive Officer
	Date: November 14, 2018
By:	/s/ Gene Mack
	Gene Mack
	Chief Financial Officer
	Date: November 14, 2018

38

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Angelos M. Stergiou, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of SELLAS Life Sciences Group, 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 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 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 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.

Dated: November 14, 2018

/s/ Angelos M. Stergiou

Angelos M. Stergious, MD, ScD h.c.

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Gene Mack, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of SELLAS Life Sciences Group, 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 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 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 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.

Dated: November 14, 2018

/s/ Gene Mack

Gene Mack

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION 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 accompanying Quarterly Report of SELLAS Life Sciences Group, Inc., (the “Company”) on Form 10-Q for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officers of the Company certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to their knowledge:

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

2. The information contained in the Report fairly presents, in all material respects, the Company’s financial condition and result of operations.

By:	/s/ Angelos M. Stergiou
	Angelos M. Stergious, MD, ScD h.c.
	President and Chief Executive Officer
	Date: November 14, 2018
By:	/s/ Gene Mack
	Gene Mack
	Chief Financial Officer
	Date: November 14, 2018

A signed original of this written statement required by Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. Section 1350 has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Registrant under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, (whether made before or after the date of the Report), irrespective of any general incorporation language contained in such filing.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 09, 2018
Document Document And Entity Information [Abstract]
Entity Registrant Name	SELLAS Life Sciences Group, Inc.
Trading Symbol	SLS
Entity Central Index Key	0001390478
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		22,026,476

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 9,968	$ 2,319
Restricted cash and cash equivalents	114	10,431
Other receivable	6,600	0
Litigation settlement insurance recovery	474	0
Prepaid expenses and other current assets	651	337
Total current assets	17,807	13,087
In-process research and development	17,600	17,600
Goodwill	1,914	1,914
Deposits and other assets	1,149	925
Total assets	38,470	33,526
Current liabilities:
Current portion of long-term debt	76	8,377
Accounts payable	7,238	11,691
Accrued expenses and other current liabilities	4,683	3,201
Litigation settlement payable	0	1,300
Total current liabilities	11,997	24,569
Deferred tax liability	1,722	1,673
Warrant liability	975	1,309
Contingent consideration	5,319	1,294
Long-term debt, net of current portion	0	2,611
Total liabilities	20,013	31,456
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; Series A convertible preferred stock, 17,500 shares designated; no shares issued and outstanding at September 30, 2018 and December 31, 2017	0	0
Common stock, $0.0001 par value; 350,000,000 shares authorized, 20,501,476 shares issued and outstanding at September 30, 2018; 5,766,891 shares issued and outstanding at December 31, 2017	2	1
Additional paid-in capital	86,987	56,254
Accumulated deficit	(68,532)	(54,185)
Total stockholders’ equity	18,457	2,070
Total liabilities and stockholders’ equity	$ 38,470	$ 33,526

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common stock, shares issued (in shares)	20,501,476	5,766,891
Common stock, shares outstanding (in shares)	20,501,476	5,766,891
Series A Preferred Stock
Preferred stock, shares authorized (in shares)	17,500

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating expenses:
Research and development	$ 1,720	$ 1,068	$ 5,116	$ 5,079
General and administrative	1,341	3,222	10,130	9,350
Total operating expenses and operating loss	(3,061)	(4,290)	(15,246)	(14,429)
Non-operating income (expense):
Change in fair value of warrant liability	2,241	0	5,340	0
Change in fair value of contingent consideration	(162)	0	(4,025)	0
Loss on settlement of liability-classified warrants	0	0	(727)	0
Gain on extinguishment of debt	766	0	766	0
Interest expense, net	(74)	(102)	(292)	(360)
Total non-operating income (expense), net	2,771	(102)	1,062	(360)
Loss before income taxes	(290)	(4,392)	(14,184)	(14,789)
Income tax expense	0	63	163	180
Net loss	(290)	(4,455)	(14,347)	(14,969)
Deemed dividend arising from beneficial conversion feature of convertible preferred stock	0	0	(4,436)	0
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision	(8,654)	0	(8,654)	0
Impact of anti-dilution protection on liability-classified warrants	(491)	0	(491)	0
Net loss attributable to common stockholders	$ (9,435)	$ (4,455)	$ (27,928)	$ (14,969)
Per share information:
Net loss per common share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.53)	$ (2.27)	$ (2.75)	$ (4.56)
Weighted-average common shares outstanding, basic and diluted (in shares)	17,635,671	1,962,822	10,161,153	3,284,351

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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Patel vs Galena biopharma, Inc	Patel vs Galena biopharma, Inc Common Stock	Patel vs Galena biopharma, Inc Additional Paid-In Capital	Secured Debt	Secured Debt Common Stock	Secured Debt Additional Paid-In Capital	Convertible Preferred Stock	Convertible Preferred Stock Preferred Stock	Convertible Preferred Stock Common Stock	Convertible Preferred Stock Additional Paid-In Capital	Convertible Notes Payable	Convertible Notes Payable Common Stock	Convertible Notes Payable Additional Paid-In Capital
Beginning balance (in shares) at Dec. 31, 2017		0	5,766,891
Beginning balance at Dec. 31, 2017	$ 2,070	$ 0	$ 1	$ 56,254	$ (54,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Stock (in shares)		10,700	6,845,000				228,672			715,277
Issuance of Series A convertible preferred stock, net of offering costs	9,647			9,647
Issuance of stock, amount	21,564		$ 1	21,563		$ 1,250		$ 1,250	$ 2,896		$ 2,896
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock offering	(5,039)			(5,039)
Beneficial conversion feature arising from Series A convertible preferred stock	(4,436)			(4,436)
Deemed dividend arising from beneficial conversion feature of Series A convertible preferred stock	4,436			4,436
Issuance of common stock (in shares)		2,898	499,682										(7,802)	3,748,184			118,644
Convertible preferred stock dividends	(487)			(487)
Issuance of common stock as result of conversion												$ (8,654)			$ (8,654)	$ 825		$ 825
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision	8,654			8,654
Impact of anti-dilution protection on liability-classified warrants	(491)			(491)
Issuance of common stock in connection with warrant exchange agreements (in shares)			54,343
Issuance of common stock in connection with warrant exchange agreements	285			285
Issuance of common stock upon exercise of pre-funded warrants			2,524,783
Stock-based compensation	284			284
Net loss	(14,347)				(14,347)
Ending balance (in shares) at Sep. 30, 2018		0	20,501,476
Ending balance at Sep. 30, 2018	$ 18,457	$ 0	$ 2	$ 86,987	$ (68,532)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (14,347)	$ (14,969)
Adjustment to reconcile net loss to net cash used in operating activities:
Gain on extinguishment of debt	(766)	0
Non-cash interest expense	134	258
Deferred taxes	49	7
Loss on extinguishment of payables	0	634
Non-cash stock-based compensation	284	3,776
Amortization of research and development expense		257
Fair value of common stock issued in exchange for services	0	325
Fair value of common stock issued in connection with litigation settlements	1,250	0
Change in fair value of common stock warrants	(5,340)	0
Change in fair value of contingent consideration	4,025	0
Loss on settlement of liability-classified warrants	727	0
Changes in operating assets and liabilities:
Other receivable	(6,600)	0
Prepaid expenses and other assets	(538)	3
Litigation settlement insurance recovery	(474)	0
Accounts payable	(4,453)	377
Accrued expenses and other current liabilities	182	85
Net cash used in operating activities	(25,867)	(9,247)
Cash flows from financing activities:
Net proceeds from issuance of Series A convertible preferred stock and common stock warrants	9,647	0
Proceeds from issuance of common stock	21,564	6,007
Dividends paid	(487)	0
Principal payments on long-term debt	(7,525)	(353)
Net cash provided by financing activities	23,199	5,654
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents	(2,668)	(3,593)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the beginning of period	12,750	5,962
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the end of period	10,082	2,369
Supplemental disclosure of cash flow information:
Cash received during the periods for interest	166	0
Cash paid during the periods for interest	321	0
Supplemental disclosure of non-cash investing and financing activities:
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock recorded as issuance cost	5,039
Repayment of interest and principal on long-term debt through issuance of common stock	3,587	0
Reclassification of warrant liabilities upon exchange for shares of common stock	285	0
Impact of anti-dilution protection on liability-classified warrants	491	0
Debt issued in connection with warrant exchange agreements	$ 966	$ 0

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Organization and Description of Business

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Organization and Description of Business

Organization and Description of Business

Overview

SELLAS Life Sciences Group, Inc. (the "Company," or “SELLAS”) is a late-stage biopharmaceutical company focused on the development and commercialization of novel cancer immunotherapeutics for a broad range of indications.

Merger of Galena Biopharma, Inc. and SELLAS Life Sciences Group Ltd.

As used in this quarterly report on Form 10-Q, the words the “Company,” and “SELLAS” refer to SELLAS Life Sciences Group, Inc. and its consolidated subsidiaries following completion of the business combination with Galena Biopharma, Inc., a Delaware corporation ("Galena"). This business combination is referred to as the Merger.

On December 29, 2017, Galena completed the Merger with SELLAS Life Sciences Group, Ltd., a privately held Bermuda exempted company ("Private SELLAS"), in accordance with the terms of the Agreement and Plan of Merger and Reorganization, dated as of August 7, 2017 and amended November 5, 2017 (the "Merger Agreement"), among the Company, Sellas Intermediate Holdings I, Inc., Sellas Intermediate Holdings II, Inc., Galena Bermuda Merger Sub, Ltd., and Private SELLAS. As a result of the Merger, the Company’s business is now substantially comprised of the business of Private SELLAS, and although the Company is considered the legal acquiror of Private SELLAS, for accounting purposes, Private SELLAS is considered to have acquired the Company in the Merger. Consequently, the Merger was accounted for as a reverse acquisition and the Private SELLAS financial statements became the Company's financial statements.

Immediately prior to the Merger, Galena effected a 1-for-30 reverse stock split of its outstanding common stock, par value $0.0001 per share. Under the terms of the Merger Agreement, Galena issued shares of its common stock to Private SELLAS’ securityholders at an exchange ratio of 43.9972 shares of its common stock in exchange for each common share of Private SELLAS outstanding immediately prior to the Merger. The Company also assumed all of the restricted stock units (“RSUs”) issued and outstanding under the Private SELLAS Stock Incentive Plan #1, and all of the issued and outstanding warrants of Private SELLAS. Accordingly, such RSUs will now be settled in, and such warrants now are exercisable for, shares of the Company’s common stock. Accordingly, immediately after the Merger, there were 5,766,891 shares of the Company’s common stock outstanding, with the former Private SELLAS securityholders owning 67.5% of the Company’s fully diluted common stock, and the Company’s pre-Merger securityholders owning the remaining 32.5%. The number of shares and per share amounts of common stock in the accompanying condensed consolidated financial statements and notes to the condensed consolidated financial statements have been restated to give retroactive effect to the common stock conversion ratio and reverse stock split for all periods presented, including common stock options, RSUs, and common stock warrants.

Upon completion of the Merger, the Company’s name changed from “Galena Biopharma, Inc.” to “SELLAS Life Sciences Group, Inc.," the Company’s financial statements became those of Private SELLAS and the Company's common stock began trading on The Nasdaq Capital Market under a new ticker symbol “SLS” on January 2, 2018.

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Liquidity

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Liquidity

Liquidity

The Company has not generated any revenues, including from product sales, and has funded operations primarily from the proceeds of sales of its equity interests and convertible notes, as well as through the Merger. Substantial additional financing will be required by the Company to continue to fund its research and development activities. No assurance can be given that any such financing will be available when needed or that the Company’s research and development efforts will be successful.

On July 16, 2018, the Company closed an underwritten public offering (the "July 2018 Offering"), issuing 6,845,000 shares of common stock and 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other estimated July 2018 Offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

In addition to the proceeds from the July 2018 Offering, on March 7, 2018, the Company entered into a definitive securities purchase agreement to issue shares of its Series A convertible preferred stock (“Series A Convertible Preferred”) and warrants to purchase shares of its common stock in a private placement transaction to a select group of institutional investors. The sale of the aggregate 10,700 shares of Series A Convertible Preferred and 5.5 year warrants to acquire an aggregate of 1,383,631 shares of common stock at $6.59 per share closed in two tranches and resulted in aggregate gross proceeds to the Company of approximately $10.7 million. The Company closed the first tranche for approximately $6.0 million gross proceeds on March 9, 2018. The Company closed the second tranche of the remaining $4.7 million gross proceeds on May 1, 2018, following the receipt of necessary stockholder approval.

The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with third parties and other strategic alliances and business transactions.

The Company currently does not have any commitments to obtain additional funds and may be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with third parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently, consider various other strategic alternatives, including a merger or sale of the Company, or cease operations. If the Company engages in collaborations, it may receive lower consideration upon commercialization of such products than if it had not entered into such arrangements or if it entered into such arrangements at later stages in the product development process.

The Company has evaluated the guidance of Accounting Standards Codification ("ASC") 205-40, Presentation of Financial Statements - Going Concern, in order to determine whether there is substantial doubt about its ability to continue as a going concern for one year from the date its financial statements are available to be issued. The Company has prepared its condensed consolidated financial statements assuming that it will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred net losses since inception and it expects to generate losses from operations for the foreseeable future primarily due to research and development costs for its potential product candidates, which raises substantial doubt about the Company’s ability to continue as a going concern. Various internal and external factors will affect whether and when the Company’s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company’s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company’s financial condition and future operations. The consolidated 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 this uncertainty.

As of September 30, 2018, the Company had cash and cash equivalents of approximately $10.0 million, restricted cash balance of $0.1 million, other receivable of $6.6 million (received in November 2018), and $0.5 million in litigation insurance recovery (received in October 2018). In addition, the Company had outstanding accounts payable and accrued expenses of $11.9 million and indebtedness of $0.1 million as of September 30, 2018. The Company expects its existing cash as of September 30, 2018, including amounts received in October and November 2018, will enable the Company to fund its operating expenses and capital expenditure requirements through March 2019.

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Basis Of Presentation and Significant Accounting Policies

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the ASC and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Principles of Consolidation

The condensed consolidated financial statements include the financial statements of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation.

Unaudited Interim Results

These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company's annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the Securities and Exchange Commission ("SEC") on April 13, 2018 (the "2017 Annual Report"). The accompanying condensed consolidated financial statements at September 30, 2018 and for the three and nine months ended September 30, 2018 and 2017, are unaudited, but include all adjustments, consisting of normal recurring entries, that management believes to be necessary for a fair presentation of the periods presented. Interim results are not necessarily indicative of results for a full year. Balance sheet amounts as of December 31, 2017 have been derived from the audited financial statements as of that date.

Preferred Stock

The Company applies the accounting standards for distinguishing liabilities from equity when determining the classification and measurement of its preferred stock. Preferred shares subject to mandatory redemption are classified as liability instruments and are measured at fair value. Conditionally redeemable preferred shares (including preferred shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, preferred shares are classified as stockholders’ equity.

Convertible Instruments

The Company applies the accounting standards for derivatives and hedging and for distinguishing liabilities from equity when accounting for hybrid contracts that feature conversion options. The accounting standards require companies to bifurcate conversion options from their host instruments and account for them as free-standing derivative financial instruments according to certain criteria. The criteria include circumstances in which (i) the economic characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, (ii) the hybrid instrument that embodies both the embedded derivative instrument and the host contract is not re-measured at fair value under otherwise applicable generally accepted accounting principles with changes in fair value reported in earnings as they occur and (iii) a separate instrument with the same terms as the embedded derivative instrument would be considered a derivative instrument.

Conversion options that contain variable settlement features such as provisions to adjust the conversion price upon subsequent issuances of equity or equity linked securities at exercise prices more favorable than that featured in the hybrid contract generally result in their bifurcation from the host instrument.

The Company also records, when necessary, deemed dividends for the intrinsic value of the conversion options embedded in preferred stock based upon the difference between the fair value of the underlying common stock at the commitment date of the transaction and the effective conversion price embedded in the preferred stock.

Recent Accounting Pronouncements Pending Adoption

In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Accounting, which simplifies the accounting for share-based payments granted to nonemployees for goods and services. The ASU supersedes ASC 505-50 and expands the scope of ASC 718 to include all share-based payment arrangements related to the acquisition of goods and services from both nonemployees and employees. As a

result, most of the guidance in ASC 718 associated with employee share-based payments, including most of its requirements related to classification and measurement, applies to nonemployee share-based payment arrangements. ASU 2018-07 generally requires an entity to use a modified retrospective transition approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year, for all (1) liability-classified nonemployee awards that have not been settled as of the adoption date and (2) equity-classified nonemployee awards for which a measurement date has not been established. The guidance is applicable to public business entities for fiscal years beginning after December 15, 2019 and interim periods within those years. The Company is currently evaluating the potential impact of the adoption of this standard on its consolidated results of operations, financial position and cash flows and related disclosures.

In February 2016, the FASB issued ASU 2016-02, Leases. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, and No. 2018-11, Leases (Topic 842) - Targeted Improvements. The new standard establishes a right-of-use, or ROU, model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

In August 2018, FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 modifies, adds and removes certain specific the disclosure requirements on fair value measurements in Topic 820. The amendments in ASU 2018-13 are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

Recent Accounting Pronouncements Adopted

In November 2016, the FASB issued ASU No. 2016-18, Restricted Cash. ASU No. 2016-18 requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown in the statement of cash flows. In accordance with ASU No. 2016-18, the Company adopted this standard in the first quarter of 2018. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

The following table provides a reconciliation of the components of cash, cash equivalents, restricted cash, and restricted cash equivalents reported in the Company's condensed consolidated balance sheets to the total of the amount presented in the condensed consolidated statements of cash flows (in thousands):

	September 30, 2018		December 31, 2017
Cash and cash equivalents	$	9,968	$	2,319
Restricted cash and cash equivalents	114		10,431
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$	10,082	$	12,750

In connection with the Company's Senior Secured Debenture described in Notes 7 and 8, the Company was required to maintain a minimum of the lesser of $18.5 million or the outstanding principal amount of unencumbered cash in a restricted account. Any funds in the restricted account in excess of the outstanding principal balance were to be transferred to the Company's unrestricted account to fund its ongoing operations. As of December 31, 2017, the Company maintained $10.2 million of cash and cash equivalents in a restricted account. The Senior Secured Debenture was deemed to be no longer outstanding as of September 30, 2018. In addition, the Company maintained $0.1 million and $0.2 million as of September 30, 2018 and December 31, 2017, respectively, on hand with the Company's financial institutions as collateral for its corporate credit cards.

In May 2017, the FASB issued ASU No. 2017-09, Scope of Modification Accounting. ASU No. 2017-09 clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. This guidance is to be applied prospectively to awards modified on or after the adoption date and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, with early adoption permitted. In accordance with ASU No. 2017-09, the Company adopted this standard prospectively in the first quarter of 2018. The adoption of ASU No. 2017-09 did not have a material impact on the Company's condensed consolidated financial statements.

Reclassifications 

Certain prior year amounts have been reclassified to conform to current year presentation. These reclassifications had no effect on net loss per share.

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Acquisition

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Acquisition

Acquisition

On December 29, 2017, the Company completed the Merger with Private SELLAS as discussed in Note 1. The Merger was accounted for as a reverse merger under the acquisition method of accounting whereby Private SELLAS was considered to have acquired the Company for financial reporting purposes because, immediately upon completion of the Merger, Private SELLAS stockholders held a majority of the voting interest of the combined company.

The following summary pro forma condensed consolidated financial information reflects the Merger with Galena as if it had occurred on January 1, 2017 for purposes of the statements of operations. This summary pro forma information is not necessarily representative of what the Company’s results of operations would have been had the Merger in fact occurred on January 1, 2017, and is not intended to project the Company’s results of operations for any future period.

	Three Months Ended September 30, 2017			Nine Months Ended September 30, 2017
Net loss	$	(9,066	)	$	(21,690	)
Basic and diluted net loss per share	$	(1.61	)	$	4.92

Pro forma combined net loss includes an adjustment to reduce historical interest expense of $0.2 million and $0.3 million for the three and nine months ended September 30, 2017, respectively, due to the conversion of the convertible notes of $5.8 million. The Company excluded a $5.2 million impairment charge incurred by the Company and $3.3 million of transaction costs related to the Merger from the pro forma financial information for the three and nine months ended September 30, 2017.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The following tables present information about the Company's assets and liabilities measured at fair value on a recurring basis in the condensed consolidated balance sheets (in thousands):

Description	September 30, 2018		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	6,774	$	6,774	$	—	$	—
Total assets measured and recorded at fair value	$	6,774	$	6,774	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	975	$	—	$	—	$	975
Contingent consideration	5,319		—		—		5,319
Total liabilities measured and recorded at fair value	$	6,294	$	—	$	—	$	6,294

Description	December 31, 2017		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	1,662	$	1,662	$	—	$	—
Restricted cash equivalents	10,245		10,245		—		—
Total assets measured and recorded at fair value	$	11,907	$	11,907	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	1,309	$	—	$	—	$	1,309
Contingent consideration	1,294		—		—		1,294
Total liabilities measured and recorded at fair value	$	2,603	$	—	$	—	$	2,603

The Company did not transfer any financial instruments into or out of Level 3 classification during the three and nine months endedSeptember 30, 2018 and 2017. See Note 10 for a reconciliation of the changes in the fair value of the warrant liability for the nine months endedSeptember 30, 2018.

A reconciliation of the change in the fair value of the contingent consideration liability for the nine months endedSeptember 30, 2018 is as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Contingent consideration, December 31, 2017	$	1,294
Change in the estimated fair value of the contingent consideration	4,025
Contingent consideration, September 30, 2018	$	5,319

The fair value of the contingent consideration is measured at the end of each reporting period using Level 3 inputs in a probability-weighted, discounted cash-outflow model. The contingent consideration relates to Galena’s acquisition of Apthera, Inc. in 2011 and the future contingent payments of up to $32.0 million based on the achievement of certain development and commercial milestones relating to the Company’s nelipepimut-S ("NeuVax^TM" or "NPS") product candidate. The contingent consideration is payable at the election of the Company in either cash or shares of common stock, provided that the Company may not issue any shares in satisfaction of any contingent consideration unless it has first obtained approval of its stockholders in accordance with Rule 5635(a) of the Nasdaq Marketplace Rules. The significant unobservable assumptions include the probability of achieving each milestone, the date the Company expects to reach the milestone, and a determination of present value factors used to discount future expected cash outflows. The change in the estimated fair value of the contingent consideration during the nine months endedSeptember 30, 2018 reflects an adjusted probability and timeline for the potential approval of NPS associated with the positive interim data in the triple-negative breast cancer cohort from the prospective, randomized, single-blinded, controlled Phase 2b investigator-sponsored clinical trial ("IST") of trastuzumab (Herceptin®) +/- NPS in HER2 1+/2+ breast cancer patients in the adjuvant setting to prevent recurrences that was announced on April 2, 2018.

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Accrued Expenses and Other Current Liabilities

9 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

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

	September 30, 2018		December 31, 2017
Professional fees*	$	2,836	$	1,744
Compensation and related benefits	808		566
Clinical trial costs	583		51
Value-added tax	158		426
Rebates and returns of former commercial products	22		223
Other	276		191
Accrued expenses and other current liabilities	$	4,683	$	3,201

*Includes approximately $2.5 million of legal fees incurred related to the JGB litigation as described in Note 8 that was reimbursed to the Company in November 2018 by JGB.

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Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

	September 30, 2018		December 31, 2017
Debt
Current portion of Senior Secured Debenture	$	—	$	8,377
Short-term convertible promissory notes	76		—
Non-current portion of Senior Secured Debenture	—		2,611
Total debt	$	76	$	10,988

Senior Secured Debenture

On May 10, 2016, the Company's predecessor company, Galena, entered into a Securities Purchase Agreement (the “Securities Purchase Agreement”) with JGB (the "Purchaser") pursuant to which Galena sold to the JGB, at a 6.375% original issue discount, a $25.5 million Senior Secured Debenture (the "Senior Secured Debenture") and warrants to purchase up to 3,333 shares of the Company's common stock. Net proceeds to Galena from the sale of the Senior Secured Debenture and warrants, after payment of commissions and legal fees, were approximately $23.4 million.

The Senior Secured Debenture originally matured November 10, 2018, with accrued interest at 9% per year, payable monthly. In addition, on the maturity date of the Senior Secured Debenture (or such earlier date that the principal amount of the Senior Secured Debenture is paid in full by acceleration or otherwise) a fixed amount, which would have been deemed interest under the Senior Secured Debenture, equal to $0.8 million was due and payable to JGB on such date in, at the option of the Company, cash and, subject to the same conditions for the payment of interest, in shares of the Company’s common stock, or a combination of cash and the Company’s common stock.

The Company’s obligations under the Senior Secured Debenture were secured under a security agreement by a senior lien on all of the Company’s assets, including all of the Company’s interests in its consolidated subsidiaries. Private SELLAS was not a party to the security agreement. Under the terms of a subsidiary guarantee agreement, each subsidiary guaranteed the performance of the Company of the Securities Purchase Agreement, Senior Secured Debenture and related agreements.

•

The Company was required to maintain a minimum of the lesser of $18.5 million or the outstanding principal amount of unencumbered cash in a restricted account. Any funds in the restricted account in excess of the outstanding principal balance were transferred to the Company's unrestricted account to fund its ongoing operations. As of December 31, 2017, the Company maintained $10.2 million of cash and cash equivalents in a restricted account.

As of December 31, 2017, the outstanding principal balance of the Senior Secured Debenture was $10.2 million. In addition to the outstanding principal balance, the Senior Secured Debenture had $0.8 million of additional interest that was included in the current portion of long-term debt as of December 31, 2017. During the nine months ended September 30, 2018, JGB redeemed $2.8 million of outstanding principal, which the Company satisfied with 659,529 shares of its common stock and redeemed $0.6 million of outstanding principal, which the Company satisfied with cash. As a result of the redemptions during 2018, the Company transferred $1.8 million of restricted cash into unrestricted cash and cash equivalents which was used to fund the Company’s ongoing operations.

JGB commenced a lawsuit against the Company as described in Note 8 ("JGB Action"). On September 24, 2018, JGB unilaterally issued a directive to (i) the financial institution that maintained the restricted cash and cash equivalents and (ii) the manager of the account to liquidate all assets in the restricted account. As a result of such directive, approximately $8.5 million in cash was removed from the restricted account, $1.6 million in excess of the outstanding principal balance of the Senior Secured Debenture at the time of the removal. On October 16, 2018, JGB was required to deposit the $1.6 million excess that JGB removed from the restricted account into an escrow account, as ordered by the Court in the JGB Action, pending resolution of the dispute between the Company and JGB. On October 23, 2018, the Court entered an order, granting, among other things, the Company's Motion for Judgment seeking dismissal of JGB's amended complaint and allowing four of the Company's counterclaims to proceed to trial. As a result of the October 23rd Court order, on November 5, 2018, the parties to the JGB Action entered into a settlement agreement. The settlement agreement provides, among other things, that JGB make a one-time payment to the Company of $6.6 million, representing the $1.6 million excess cash removed from the amount in the restricted account from the outstanding principal balance of the Senior Secured Debenture and reimbursement of approximately $5.0 million of legal fees incurred by the Company. The Company recognized a gain on extinguishment of debt of $0.8 million that was previously accrued in long-term debt representing an additional interest payable at maturity as the amount is no longer required to be repaid by the Company. Accordingly, the Senior Secured Debenture is no longer outstanding and the related agreements have been terminated.

Short-term Convertible Promissory Notes

During the nine months ended September 30, 2018, the Company entered into convertible promissory notes in the principal amount of $1.0 million in exchange for the surrender and cancellation of warrants to purchase 412,667 shares of its common stock pursuant to the February 2017 offering by Galena. The convertible promissory notes accrue interest at a rate of 5% per annum and the remaining outstanding principal balance and accrued interest is due and payable in November 2018. The outstanding principal balance and accrued interest is convertible into shares of the Company's common stock at a conversion price equal to $7.00. In April 2018, $0.8 million of outstanding principal and accrued interest was converted into 118,644 shares of common stock. As of September 30, 2018, $0.1 million principal balance and accrued interest remains outstanding.

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Legal Proceedings, Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Legal Proceedings, Commitments and Contingencies

Legal Proceedings, Commitments and Contingencies

Legal Proceedings

From time to time, the Company is subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business, which may include employment matters, breach of contract disputes and stockholder litigation. Such actions and proceedings are subject to many uncertainties and to outcomes that are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its condensed consolidated financial statements for costs related to claims, including future legal costs, settlements and judgments, when the Company has assessed that a loss is probable and an amount can be reasonably estimated. If the reasonable estimate of a probable loss is a range, the Company records the most probable estimate of the loss or the minimum amount when no amount within the range is a better estimate than any other amount. The Company discloses a contingent liability even if the liability is not probable or the amount is not estimable, or both, if there is a reasonable possibility that a material loss may have been incurred. In the opinion of management, as of the date hereof, the amount of liability, if any, with respect to these matters, individually or in the aggregate, will not materially affect the Company’s consolidated results of operations, financial position or cash flows.

The Company’s predecessor company, Galena, was involved in multiple legal proceedings and administrative actions, including stockholder class actions, both state and federal, some of which are ongoing and to which the Company are now subject as a result of the Merger. The Company is also involved in litigation matters as follows:

On February 13, 2017, putative shareholder securities class action complaints were filed in federal court alleging, among other things, that the Company and certain of the Company's former officers and directors failed to disclose that Galena’s promotional practices for Abstral^® (fentanyl sublingual tablets) were allegedly improper and that Galena may be subject to civil and criminal liability, and that these alleged failures rendered Galena’s statements about its business misleading. The actions were consolidated, lead plaintiffs were named by the Court and a consolidated complaint was filed. The Company filed a motion to dismiss the consolidated complaint. On August 21, 2018, the Company's motion to dismiss the consolidated complaint was granted without prejudice to file an amended complaint. On September 20, 2018, the plaintiffs filed an amended complaint. On October 22, 2018, the Company filed a motion to dismiss the amended complaint.

In March 2017, a derivative complaint was filed in U.S. District Court for the District of New Jersey against the Company’s former directors and Galena, as a nominal defendant. In July 2017, a derivative complaint was filed in California state court against the Company’s former directors and Galena, as a nominal defendant. In January 2018, a derivative complaint was filed in the U.S. District Court for the District of New Jersey against the Company’s former directors, officers and employees, and the Company as a nominal defendant. In June 2018, a derivative complaint was filed in U.S. District Court for the Northern District of California against the Company’s current and former directors, and the Company as a nominal defendant. The plaintiff in the June 2018 case voluntarily withdrew his complaint from the U.S District Court of the Northern District of California and on August 27, 2018 refiled the complaint in the Court of Chancery of the State of Delaware. These complaints purport to assert derivative claims for breach of fiduciary duty on the Company’s behalf against the Company’s former directors and, in certain of the complaints, the Company’s current directors, and the Company’s former officers and former employees, based on substantially similar facts as alleged in the putative shareholder securities class action complaints mentioned above. The March 2017, July 2017, and January 2018 lawsuits are currently stayed pending resolution of motions to dismiss in the referenced securities class action. On October 29, 2018, the defendants in the August 2018 lawsuit notified the plaintiff of its intent to file a motion to dismiss the lawsuit.

In April 2017, a putative stockholder class action, captioned Patel vs. Galena Biopharma Inc. et. al, was filed in Delaware state court seeking relief under Section 225 of the Delaware General Corporation Law ("DGCL") and alleging breaches of fiduciary duties by Galena’s former board of directors and former interim chief executive officer regarding the proposals to amend Galena’s certificate of incorporation to increase the amount of authorized shares of common stock and effectuate a reverse stock split at the July 2016 and October 2016 stockholder meetings, respectively. On June 2, 2017, an amended verified complaint was filed along with a motion to expedite the proceedings. On June 20, 2017, the Court consolidated the claims into In re Galena Biopharma, Inc., C. A. No. 2017-0423-JTL. On July 24, 2017, Galena entered into a binding settlement term sheet, involvingpayment of $50,000 in cash and $1,250,000 in unrestricted shares of common stock. The Court enforced the settlement term sheet on November 30, 2017. On February 22, 2018, the plaintiff filed his brief in support of the settlement as well as his request for attorneys’ fees and an incentive award. On June 14, 2018, the Court entered an Order and Final Judgment approving the settlement and awarding attorneys’ fees to the plaintiff. All obligations related to the Order and Final Judgment were satisfied in full by the Company in June 2018. In October 2018, the Company received $0.5 million from its insurance carrier for previous amounts paid by the Company in excess of its deductible. The amount is recorded as a litigation insurance recovery as of September 30, 2018 in the Company's condensed consolidated balance sheet.

On or about April 9, 2018, JGB filed a lawsuit in the U.S. District Court for the Southern District of New York (the "Court") captioned JGB (Cayman) Newton, Ltd. v. Sellas Life Sciences Group, Inc., et al., Case 1:18-cv-3095 (DLC) (the "JGB Action"). The complaint in the JGB Action asserted claims under state law and federal securities law against the Company, the Company's Chief Executive Officer, Angelos M. Stergiou, M.D., ScD h.c., and the Company's former Interim Chief Financial Officer, Aleksey N. Krylov. On or about May 2, 2018, JGB filed an amended complaint, adding as defendants Jane Wasman, Stephen Ghiglieri, David Scheinberg, M.D., Robert Van Nostrand and John Varian, each of whom is a member of the Company's Board of Directors. On May 18, 2018, the Company filed an answer to the amended complaint and filed seven counterclaims. On June 18, 2018, the Company filed a motion for judgment on the pleadings and a motion to dismiss the amended complaint. On July 6, 2018, JGB filed a motion for partial judgment on the pleadings and motion to dismiss all of the Company's counterclaims. On September 24, 2018, without any prior written notice, JGB unilaterally directed that all of the funds, approximately $8.5 million in cash, be removed from the restricted account, an amount in excess of the outstanding principal balance of the Senior Secured Debenture.

On October 23, 2018, the Court entered an Opinion and Order, granting, in full, the Company's motion to dismiss JGB's amended complaint and allowing four of the Company's counterclaims to proceed to trial. Following the October 23 Opinion and Order of the Court, the parties to the JGB Action entered into a settlement agreement on November 5, 2018. The settlement agreement provides, among other things, that JGB will make a one-time payment to the Company of $6.6 million, inclusive of the $1.6 million excess amount removed from the restricted account. The entire settlement amount was recorded as an other receivable as of September 30, 2018 in the condensed consolidated balance sheet as of September 30, 2018 and the amount was received in November 2018. The Company offset approximately $2.5 million of legal fees incurred during the three months ended September 30, 2018 previously recorded in general and administrative expense in the condensed consolidated statement of operations with proceeds from the settlement and $2.5 million legal fees incurred subsequent to September 30, 2018 recorded as an accrued liability in the condensed consolidated balance sheet. The Company recognized a gain on extinguishment of debt of $0.8 million that was previously accrued in long-term debt for an additional interest payable at maturity as the amount is no longer payable by the Company. The settlement agreement also provides for the termination of the Senior Secured Debenture and all ancillary agreements, including the security agreement covering the Company's assets as well as a release of all security interests in the collateral.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock

The Company has authorized up to 5,000,000 shares of preferred stock, $0.0001 par value per share, for issuance.

Series A Convertible Preferred

On March 7, 2018, the Company entered into a securities purchase agreement with investors, pursuant to which the Company agreed to sell to the investors, in a private placement pursuant to Rule 4(a)(2) and Regulation S under the Securities Act, an aggregate of 10,700 shares of the Company’s newly-created non-voting Series A Convertible Preferred, and warrants to acquire an aggregate 1,383,631 shares of the Company’s common stock, par value $0.0001 per share at an aggregate purchase price of $10.7 million. The Series A Convertible Preferred was initially convertible into 1,844,835 shares of common stock based on an initial conversion price of $5.80 per share.

At the first closing of the Series A Convertible Preferred on March 9, 2018, the Company issued an aggregate 5,987 shares of Series A Convertible Preferred and warrants to acquire 774,186 shares of common stock for aggregate gross proceeds of $6.0 million. The second closing of the remaining 4,713 shares of the Series A Convertible Preferred and warrants to acquire 609,445 shares of its common stock, for aggregate gross proceeds of $4.7 million, occurred on May 1, 2018 following receipt of stockholder approval.

In the event of a "qualified offering," as defined in the securities purchase agreement, holders of the Series A Convertible Preferred (the "Series A Holders"), had the right to exchange their shares of Series A Convertible Preferred for the same securities sold in a qualified offering on a $1.00 for $1.00 basis based on the stated value of their shares of Series A Convertible Preferred under the most favored nation provision. On July 16, 2018, following consummation of the July 2018 Offering, which was deemed a qualified offering as described below and also in Note 2 above, the Series A Holders exchanged an aggregate of $7,871,186 of stated valued and accrued but unpaid dividends on their Series A Convertible Preferred for an aggregate of 3,748,184 shares of the Company’s common stock and warrants to purchase an aggregate of 3,748,184 shares of the Company’s common stock. Following such exchange there are no shares of Series A Convertible Preferred issued and outstanding. The warrants have an exercise price of $2.10 per share and a term of five years. The fair value of the common stock and warrants to purchase shares of common stock exceeded the carrying amount of the Series A Preferred by $8.7 million and that amount is recorded as a deemed dividend in the condensed consolidated statements of operations during the three and nine months endedSeptember 30, 2018 as it represents a transfer of value from the common stockholders to the preferred investors. Since the Company does not have accumulated earnings, the deemed dividend is taken from additional paid-in capital. This one-time, non-cash charge impacted net loss attributable to common stockholders and loss per share for the three and nine months ended September 30, 2018.

In addition, pursuant to the terms of the warrants, the exercise price of the warrants issued to the investors in March 2018 and May 2018 was adjusted to $2.10 per share from the original exercise price of $6.59 per share. The Company recognized the $0.5 million increase to the fair value of the warrant liability as a result of the adjusted stock price as a deemed dividend in the condensed consolidated statements of operations during the three and nine months endedSeptember 30, 2018. This one-time, non-cash charge impacted net loss attributable to common stockholders and loss per share for the three and nine months ended September 30, 2018.

The Series A Convertible Preferred generally had no voting rights. However, for so long as any shares of Series A Convertible Preferred were outstanding, the affirmative vote of the holders of a majority of the then outstanding shares of the Series A Convertible Preferred was required to: (a) alter or change adversely the powers, preferences or rights given to the Series A Convertible Preferred or alter or amend the Certificate of Designation, (b) authorize or create any class of stock ranking as to dividends, redemption or distribution of assets upon a Liquidation (as defined in the Certificate of Designation) senior to, or otherwise pari passu with, the Series A Convertible Preferred, (c) amend the Company's certificate of incorporation or other charter documents in any manner that adversely affects any rights of the holders of Series A Convertible Preferred, (d) increase the number of authorized shares of Series A Convertible Preferred, or (e) enter into any agreement with respect to any of the foregoing.

Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary that is not a Fundamental Transaction (as defined in the Certificate of Designation), the holders of Series A Convertible Preferred were entitled to receive from the Company's assets the same amount they would have received on an as converted basis, disregarding any conversion limitations. Such amounts would have been paid on apari passu basis with all holders of common stock.

The Company evaluated the Series A Convertible Preferred in accordance with the provisions of ASC 815, Derivatives and Hedging, including consideration of embedded derivatives requiring bifurcation. The issuance of the Series A Convertible Preferred could generate a beneficial conversion feature (“BCF”), which arises when a debt or equity security is issued with an embedded conversion option that is beneficial to the investor or in the money at inception because the conversion option has an effective conversion price that is less than the market price of the underlying stock at the commitment date. The Company recognized the BCF by allocating the intrinsic value of the conversion option, which is the number of shares of common stock available upon conversion multiplied by the difference between the effective conversion price per share and the fair value of common stock per share on the commitment date, to additional paid-in capital, resulting in a discount on the convertible preferred stock. As the Series A Convertible Preferred could have been converted immediately, the Company recognized a BCF of $2.0 million as a deemed dividend in the condensed consolidated statements of operations related to the first closing on March 9, 2018 and an additional BCF of $2.5 million as a deemed dividend related to the second closing on May 1, 2018. These one-time, non-cash charges impacted net loss attributable to common stockholders and loss per share for the nine months ended September 30, 2018.

Common Stock

The Company has authorized up to 350,000,000 shares of common stock, $0.0001 par value per share, for issuance.

On July 16, 2018, the Company closed the July 2018 Offering, issuing 6,845,000 shares of common stock and 4,675,000 pre-funded warrants exercisable for shares of common stock and accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each accompanying common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other estimated offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

During its evaluation of equity classification for the pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock issued in the July 2018 Offering, the Company considered the conditions as prescribed within ASC 815-40, Derivatives and Hedging, Contracts in an Entity’s own Equity (“ASC 815-40”). The conditions within ASC 815-40 are not subject to a probability assessment. The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock do not fall under the liability criteria within ASC 480, Distinguishing Liabilities from Equity, as they are not puttable and do not represent an instrument that has a redeemable underlying security. The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock do meet the definition of a derivative instrument under ASC 815, but are eligible for the scope exception as they are indexed to the Company’s own stock and would be classified in permanent equity if freestanding.

Shares of common stock for future issuance are reserved for as follows (in thousands):

	September 30, 2018
Warrants outstanding	19,224
Stock options outstanding	434
Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan	381
Shares reserved for future issuance under the Employee Stock Purchase Plan	115
Restricted stock units	13
Total reserved for future issuance	20,167

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Warrants to Acquire Shares of Common Stock

9 Months Ended

Sep. 30, 2018

Warrants and Rights Note Disclosure [Abstract]

Warrants to Acquire Shares of Common Stock

Warrants to Acquire Shares of Common Stock

The following is a summary of the Company's warrants to acquire shares of common stock activity for the nine months ended September 30, 2018 (in thousands):

Warrant Issuance	Outstanding, December 31, 2017	Granted	Exercised		Canceled/Expired		Outstanding, September 30, 2018	Expiration
July 2018 Offering	—	15,268	—		—		15,268	July 2023
Pre-funded July 2018 Offering	—	4,675	(2,525	)	—		2,150	July 2023
Series A Convertible Preferred	—	1,384	—				1,384	September 2023
2017 Equilibria	316	—	—				316	December 2022
Galena February 2017	567	—	—		(535	)	32	February 2022
Galena Other	80	—	—		(6	)	74	January 2022
	963	21,327	(2,525	)	(541	)	19,224

Warrants to acquire shares of common stock consist of warrants that may be settled in cash, which are liability-classified warrants, and equity-classified warrants. During the nine months ended September 30, 2018, a total of 534,333 of the Galena February 2017 liability-classified warrants to purchase shares of common stock were canceled under various warrant exchange agreements. The Company issued 54,613 shares of its common stock in exchange for the surrender and cancellation of warrants to acquire 121,667 shares of its common stock and $1.0 million in convertible promissory notes in exchange for the surrender and cancellation of warrants to acquire 412,667 shares of its common stock, as described in Note 7. The fair value of the common stock and promissory notes exchanged totaled $1.2 million, which exceeded the fair value of the warrant liability of the warrants canceled by $0.7 million and is recorded as loss on settlement of liability-classified warrants in the condensed consolidated statement of operations for the nine months ended September 30, 2018. In April 2018, $0.8 million of outstanding principal and accrued interest was converted into 118,644 shares of common stock.

Warrants Classified as Liabilities

Liability-classified warrants consist of warrants to acquire common stock issued in connection with previous equity financings for the Series A Convertible Preferred, Galena's February 2017 financing, and various other Galena equity financings that were assumed by the Company at the consummation of the Merger. These warrants may be settled in cash and were determined to not be indexed to the Company’s common stock.

Prior to the consummation of the July 2018 Offering, the initial exercise price of the warrants to acquire shares of common stock in connection with the Series A Convertible Preferred was $6.59 per share of common stock, subject to standard adjustments for certain transactions affecting the Company’s securities (such as stock dividends, and stock splits). From the original issue date until the one-year anniversary of a qualified offering, the initial exercise price and number of warrants to acquire shares of common stock are subject to anti-dilution protection in the event of non-exempt equity issuances at a price per share lower than the then exercise price (the "Base Share Price"). Simultaneously with the consummation of each non-exempt equity issuance the exercise price shall be reduced to equal the Base Share Price. Such adjustment shall be made whenever such common stock or common stock equivalents are issued.

The estimated fair value of outstanding warrants accounted for as liabilities is determined at each balance sheet date. Any decrease or increase in the estimated fair value of the warrant liability since the most recent balance sheet date is recorded in the condensed consolidated statement of operations as change in fair value of warrant liability. The fair value of the warrants is estimated using a Black-Scholes pricing model with the following inputs:

As of September 30, 2018
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Series A Convertible Preferred	1,384	$	2.10	5.01	83.18	%	2.94	%
Galena February 2017	32	$	33.00	3.38	85.39	%	2.25	%
Galena Other	74	$	888.22	2.68	85.96	%	2.32	%
As of December 31, 2017
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Galena February 2017	567	$	13.00	4.12	79.29	%	2.09	%
Galena Other	80	$	28.40	3.19	74.05	%	2.09	%

The expected volatility assumptions are based on the Company's implied volatility in combination with the implied volatilities of similar publicly traded entities. The expected life assumption is based on the remaining contractual terms of the warrants. The risk-free rate is based on the zero coupon rates in effect at the time of valuation. The dividend yield used in the pricing model is zero, because the Company has no present intention to pay cash dividends.

The changes in fair value of the warrant liability for the nine months ended September 30, 2018 were as follows (in thousands):

Warrant Issuance	Warrant liability, December 31, 2017		Fair value of warrants granted		Fair value of warrants canceled			Adjustment to exercise price of warrants		Change in fair value of warrants			Warrant liability, September 30, 2018
Series A Convertible Preferred	$	—	$	5,039	$	—		$	491	$	(4,558	)	$	972
Galena February 2017	1,305		—		(524		)	—		(778		)	3
Galena Other	4		—		—			—		(4		)	—
	$	1,309	$	5,039	$	(524	)	$	491	$	(5,340	)	$	975

Warrants Classified as Equity

The Company issued warrants to acquire 316,163 shares of the its common stock at an exercise price of $7.42 per share, maturing five years from issuance, to EQC Private Markets SAC Fund Ltd-EQC Biotech Sely I Fund on December 29, 2017. These warrants are recorded in equity at fair value upon issuance, and not as liabilities, and are not subject to adjustment to fair value in subsequent reporting periods. The fair value of the warrants granted was $5.60 per share using the Black-Scholes pricing model with the fair value assumptions for the grant including a volatility of 90.10%, expected term of five years, risk free rate of 2.20%, and a dividend rate of 0.00.

The pre-funded warrants exercisable for shares of common stock and warrants to acquire shares of common stock issued during the July 2018 offering are recorded in equity upon issuance as described in Note 9.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Share and per share amounts below have been retroactively adjusted to reflect the exchange ratio and reverse stock split as described in Note 1.

2017 Equity Incentive Plan

On December 29, 2017, the 2017 Equity Incentive Plan was approved, and currently allows for the issuance of up to a maximum of approximately 575,000 shares of common stock in connection with the grant of stock-based awards, including stock options, restricted stock, restricted stock units, stock appreciation rights and other types of awards as deemed appropriate, not including shares subject to awards assumed in connection with certain transactions, including the Merger. Upon the consummation of the Merger, the Company assumed approximately 10,171 shares subject to outstanding common stock options granted under the Company’s 2016 Incentive Plan that will remain exercisable through December 29, 2018 for former Company employees and directors.

The number of shares reserved for issuance under the 2017 Equity Incentive Plan will automatically increase on January 1 of each year, for a period of not more than ten years, commencing on January 1 of the year following the year in which the effective date occurs and ending on (and including) January 1, 2027, in an amount equal to 4% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year. Notwithstanding the foregoing, the board of directors may act prior to January 1 of a given year to provide that there will be no January 1 increase in the share reserve for such year or that the increase in the share reserve for such year will be a lesser number of shares of common stock than would otherwise occur pursuant to the preceding sentence. The number of shares reserved for issuance under the 2017 Equity Incentive Plan was automatically increased to approximately 805,000 on January 1, 2018. As of September 30, 2018, an aggregate of approximately 381,000 shares of common stock were reserved for future grants under the Company’s 2017 Equity Incentive Plan. There were no common stock options granted under the 2017 Equity Incentive Plan for the year ended December 31, 2017.

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	21	$	543	$	55	$	729
General and administrative	115		724		229		3,047
Total stock-based compensation	$	136	$	1,267	$	284	$	3,776

Options to Purchase Shares of Common Stock

The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the fair value of all its stock options granted during the nine months ended September 30, 2018:

	Nine Months Ended September 30, 2018
Risk free interest rate	2.73	%
Volatility	80.83	%
Expected lives (years)	6.20
Expected dividend yield	—	%

The weighted-average grant date fair value of options granted during the nine months ended September 30, 2018 was $3.73. There were no stock options granted during the three months ended September 30, 2018 and the nine months ended September 30, 2017.

The Company’s expected common stock price volatility assumption is based upon the Company's own implied volatility in combination with the implied volatility of a basket of comparable companies. The expected life assumptions for employee grants were based upon the simplified method, which averages the contractual term of the Company’s options of ten years with the average vesting term of four years for an average of six years. The expected life assumptions for non-employees were based upon the contractual term of the option. The dividend yield assumption is zero, because the Company has never paid cash dividends and presently has no intention to do so. The risk-free interest rate used for each grant was also based upon prevailing short-term interest rates. The Company accounts for forfeitures as they occur.

As of September 30, 2018, there was $1.2 million of unrecognized compensation cost related to outstanding stock options that is expected to be recognized as a component of the Company’s operating expenses over a weighted-average period of 2.46 years.

The following table summarizes stock option activity of the Company for the nine months ended September 30, 2018:

	Total Number of Shares (In Thousands)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2018	10		$	1,240.55	1.00	$	—
Granted	483		5.24			—
Canceled	(59	)	5.24			$	—
Outstanding at September 30, 2018	434		$	34.17	9.26	$	—
Options exercisable at September 30, 2018	43		$	265.35	7.51	$	—

The aggregate intrinsic values of outstanding and exercisable stock options at September 30, 2018 were calculated based on the closing price of the Company’s common stock as reported on the Nasdaq Capital Market on September 30, 2018 of $1.22 per share. The aggregate intrinsic value equals the positive difference between the closing fair market value of the Company’s common stock and the exercise price of the underlying stock options.

RSUs with Time-Based and Performance-Based Conditions

The Company granted RSUs subject to both time-based and performance-based vesting conditions to certain of its employees and non-employees pursuant to the 2016 Incentive Plan. These RSUs vest based on both (i) continued service either over a three-year measurement period or at the end of the required service period and (ii) the achievement of a liquidity event. The initial vesting date for these RSUs was February 27, 2018. The liquidity event, as defined in the relevant RSU grant agreements, will be satisfied upon the earlier of either: (a) change of control or (b) a qualified public offering. As of September 30, 2018 and December 31, 2017, there were approximately 13,000 RSUs outstanding with a weighted average grant date fair value of $52.94.

The Company recognizes compensation expense related to these RSUs when the liquidity event is deemed probable. As such, no compensation expense was recorded to date as the liquidity event is outside the Company’s control and not deemed probable until it occurs.

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Subsequent Events

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company evaluated all events or transactions that occurred after September 30, 2018 up through the date these financial statements were issued. Other than as disclosed elsewhere in the notes to the condensed consolidated financial statements, the Company did not have any material subsequent events.

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Basis Of Presentation and Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the ASC and Accounting Standards Updates (“ASU”) of the Financial Accounting Standards Board (“FASB”).

Principles of Consolidation

Principles of Consolidation

The condensed consolidated financial statements include the financial statements of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation.

Preferred Stock

Preferred Stock

The Company applies the accounting standards for distinguishing liabilities from equity when determining the classification and measurement of its preferred stock. Preferred shares subject to mandatory redemption are classified as liability instruments and are measured at fair value. Conditionally redeemable preferred shares (including preferred shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, preferred shares are classified as stockholders’ equity.

Convertible Instruments

Convertible Instruments

The Company applies the accounting standards for derivatives and hedging and for distinguishing liabilities from equity when accounting for hybrid contracts that feature conversion options. The accounting standards require companies to bifurcate conversion options from their host instruments and account for them as free-standing derivative financial instruments according to certain criteria. The criteria include circumstances in which (i) the economic characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, (ii) the hybrid instrument that embodies both the embedded derivative instrument and the host contract is not re-measured at fair value under otherwise applicable generally accepted accounting principles with changes in fair value reported in earnings as they occur and (iii) a separate instrument with the same terms as the embedded derivative instrument would be considered a derivative instrument.

Conversion options that contain variable settlement features such as provisions to adjust the conversion price upon subsequent issuances of equity or equity linked securities at exercise prices more favorable than that featured in the hybrid contract generally result in their bifurcation from the host instrument.

The Company also records, when necessary, deemed dividends for the intrinsic value of the conversion options embedded in preferred stock based upon the difference between the fair value of the underlying common stock at the commitment date of the transaction and the effective conversion price embedded in the preferred stock.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Pending Adoption

In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Accounting, which simplifies the accounting for share-based payments granted to nonemployees for goods and services. The ASU supersedes ASC 505-50 and expands the scope of ASC 718 to include all share-based payment arrangements related to the acquisition of goods and services from both nonemployees and employees. As a

result, most of the guidance in ASC 718 associated with employee share-based payments, including most of its requirements related to classification and measurement, applies to nonemployee share-based payment arrangements. ASU 2018-07 generally requires an entity to use a modified retrospective transition approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year, for all (1) liability-classified nonemployee awards that have not been settled as of the adoption date and (2) equity-classified nonemployee awards for which a measurement date has not been established. The guidance is applicable to public business entities for fiscal years beginning after December 15, 2019 and interim periods within those years. The Company is currently evaluating the potential impact of the adoption of this standard on its consolidated results of operations, financial position and cash flows and related disclosures.

In February 2016, the FASB issued ASU 2016-02, Leases. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, and No. 2018-11, Leases (Topic 842) - Targeted Improvements. The new standard establishes a right-of-use, or ROU, model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

In August 2018, FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 modifies, adds and removes certain specific the disclosure requirements on fair value measurements in Topic 820. The amendments in ASU 2018-13 are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the potential impact of the adoption of the new standard on the consolidated financial statements.

Recent Accounting Pronouncements Adopted

In November 2016, the FASB issued ASU No. 2016-18, Restricted Cash. ASU No. 2016-18 requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown in the statement of cash flows. In accordance with ASU No. 2016-18, the Company adopted this standard in the first quarter of 2018. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

The following table provides a reconciliation of the components of cash, cash equivalents, restricted cash, and restricted cash equivalents reported in the Company's condensed consolidated balance sheets to the total of the amount presented in the condensed consolidated statements of cash flows (in thousands):

	September 30, 2018		December 31, 2017
Cash and cash equivalents	$	9,968	$	2,319
Restricted cash and cash equivalents	114		10,431
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$	10,082	$	12,750

In connection with the Company's Senior Secured Debenture described in Notes 7 and 8, the Company was required to maintain a minimum of the lesser of $18.5 million or the outstanding principal amount of unencumbered cash in a restricted account. Any funds in the restricted account in excess of the outstanding principal balance were to be transferred to the Company's unrestricted account to fund its ongoing operations. As of December 31, 2017, the Company maintained $10.2 million of cash and cash equivalents in a restricted account. The Senior Secured Debenture was deemed to be no longer outstanding as of September 30, 2018. In addition, the Company maintained $0.1 million and $0.2 million as of September 30, 2018 and December 31, 2017, respectively, on hand with the Company's financial institutions as collateral for its corporate credit cards.

In May 2017, the FASB issued ASU No. 2017-09, Scope of Modification Accounting. ASU No. 2017-09 clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. This guidance is to be applied prospectively to awards modified on or after the adoption date and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, with early adoption permitted. In accordance with ASU No. 2017-09, the Company adopted this standard prospectively in the first quarter of 2018. The adoption of ASU No. 2017-09 did not have a material impact on the Company's condensed consolidated financial statements.

Reclassifications 

Certain prior year amounts have been reclassified to conform to current year presentation. These reclassifications had no effect on net loss per share.

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Basis Of Presentation and Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of the components of cash, cash equivalents, restricted cash, and restricted cash equivalents reported in the Company's condensed consolidated balance sheets to the total of the amount presented in the condensed consolidated statements of cash flows (in thousands):

	September 30, 2018		December 31, 2017
Cash and cash equivalents	$	9,968	$	2,319
Restricted cash and cash equivalents	114		10,431
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$	10,082	$	12,750

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Acquisition (Tables)

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Summary of Pro Forma Information

The following summary pro forma condensed consolidated financial information reflects the Merger with Galena as if it had occurred on January 1, 2017 for purposes of the statements of operations. This summary pro forma information is not necessarily representative of what the Company’s results of operations would have been had the Merger in fact occurred on January 1, 2017, and is not intended to project the Company’s results of operations for any future period.

	Three Months Ended September 30, 2017			Nine Months Ended September 30, 2017
Net loss	$	(9,066	)	$	(21,690	)
Basic and diluted net loss per share	$	(1.61	)	$	4.92

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis

The following tables present information about the Company's assets and liabilities measured at fair value on a recurring basis in the condensed consolidated balance sheets (in thousands):

Description	September 30, 2018		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	6,774	$	6,774	$	—	$	—
Total assets measured and recorded at fair value	$	6,774	$	6,774	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	975	$	—	$	—	$	975
Contingent consideration	5,319		—		—		5,319
Total liabilities measured and recorded at fair value	$	6,294	$	—	$	—	$	6,294

Description	December 31, 2017		Quoted Prices In     Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Unobservable  Inputs (Level 3)
Assets:
Cash equivalents	$	1,662	$	1,662	$	—	$	—
Restricted cash equivalents	10,245		10,245		—		—
Total assets measured and recorded at fair value	$	11,907	$	11,907	$	—	$	—
Liabilities:
Warrants potentially settleable in cash	$	1,309	$	—	$	—	$	1,309
Contingent consideration	1,294		—		—		1,294
Total liabilities measured and recorded at fair value	$	2,603	$	—	$	—	$	2,603

Reconciliation of Level 3 Liabilities

A reconciliation of the change in the fair value of the contingent consideration liability for the nine months endedSeptember 30, 2018 is as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Contingent consideration, December 31, 2017	$	1,294
Change in the estimated fair value of the contingent consideration	4,025
Contingent consideration, September 30, 2018	$	5,319

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Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

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

	September 30, 2018		December 31, 2017
Professional fees*	$	2,836	$	1,744
Compensation and related benefits	808		566
Clinical trial costs	583		51
Value-added tax	158		426
Rebates and returns of former commercial products	22		223
Other	276		191
Accrued expenses and other current liabilities	$	4,683	$	3,201

*Includes approximately $2.5 million of legal fees incurred related to the JGB litigation as described in Note 8 that was reimbursed to the Company in November 2018 by JGB.

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Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Debt

	September 30, 2018		December 31, 2017
Debt
Current portion of Senior Secured Debenture	$	—	$	8,377
Short-term convertible promissory notes	76		—
Non-current portion of Senior Secured Debenture	—		2,611
Total debt	$	76	$	10,988

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Common Stock are Reserved for Future Issuance

Shares of common stock for future issuance are reserved for as follows (in thousands):

	September 30, 2018
Warrants outstanding	19,224
Stock options outstanding	434
Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan	381
Shares reserved for future issuance under the Employee Stock Purchase Plan	115
Restricted stock units	13
Total reserved for future issuance	20,167

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Warrants to Acquire Shares of Common Stock (Tables)

9 Months Ended

Sep. 30, 2018

Warrants and Rights Note Disclosure [Abstract]

Schedule Of Warrant Activity Table

The following is a summary of the Company's warrants to acquire shares of common stock activity for the nine months ended September 30, 2018 (in thousands):

Warrant Issuance	Outstanding, December 31, 2017	Granted	Exercised		Canceled/Expired		Outstanding, September 30, 2018	Expiration
July 2018 Offering	—	15,268	—		—		15,268	July 2023
Pre-funded July 2018 Offering	—	4,675	(2,525	)	—		2,150	July 2023
Series A Convertible Preferred	—	1,384	—				1,384	September 2023
2017 Equilibria	316	—	—				316	December 2022
Galena February 2017	567	—	—		(535	)	32	February 2022
Galena Other	80	—	—		(6	)	74	January 2022
	963	21,327	(2,525	)	(541	)	19,224

Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model

The fair value of the warrants is estimated using a Black-Scholes pricing model with the following inputs:

As of September 30, 2018
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Series A Convertible Preferred	1,384	$	2.10	5.01	83.18	%	2.94	%
Galena February 2017	32	$	33.00	3.38	85.39	%	2.25	%
Galena Other	74	$	888.22	2.68	85.96	%	2.32	%
As of December 31, 2017
Warrant Issuance	Outstanding (in thousands)	Strike price (per share)		Expected term (years)	Volatility %		Risk-free rate %
Galena February 2017	567	$	13.00	4.12	79.29	%	2.09	%
Galena Other	80	$	28.40	3.19	74.05	%	2.09	%

Changes in Fair Value of Warrant Liability

The changes in fair value of the warrant liability for the nine months ended September 30, 2018 were as follows (in thousands):

Warrant Issuance	Warrant liability, December 31, 2017		Fair value of warrants granted		Fair value of warrants canceled			Adjustment to exercise price of warrants		Change in fair value of warrants			Warrant liability, September 30, 2018
Series A Convertible Preferred	$	—	$	5,039	$	—		$	491	$	(4,558	)	$	972
Galena February 2017	1,305		—		(524		)	—		(778		)	3
Galena Other	4		—		—			—		(4		)	—
	$	1,309	$	5,039	$	(524	)	$	491	$	(5,340	)	$	975

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Allocated Stock-based Compensation Expense

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	21	$	543	$	55	$	729
General and administrative	115		724		229		3,047
Total stock-based compensation	$	136	$	1,267	$	284	$	3,776

Assumptions for Option Grants Issued

The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the fair value of all its stock options granted during the nine months ended September 30, 2018:

	Nine Months Ended September 30, 2018
Risk free interest rate	2.73	%
Volatility	80.83	%
Expected lives (years)	6.20
Expected dividend yield	—	%

Stock Option Activity

The following table summarizes stock option activity of the Company for the nine months ended September 30, 2018:

	Total Number of Shares (In Thousands)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2018	10		$	1,240.55	1.00	$	—
Granted	483		5.24			—
Canceled	(59	)	5.24			$	—
Outstanding at September 30, 2018	434		$	34.17	9.26	$	—
Options exercisable at September 30, 2018	43		$	265.35	7.51	$	—

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Organization and Description of Business (Narrative) (Details)	Dec. 29, 2017 shares	Dec. 28, 2017 $ / shares	Sep. 30, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Common stock, par value (usd per share)			$ 0.0001	$ 0.0001
Common stock, shares outstanding (in shares) | shares	5,766,891		20,501,476	5,766,891
Galena Biopharma, Inc
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Reverse stock split ratio		0.0333
Common stock, par value (usd per share)		$ 0.0001
Private SELLAS Security Holders
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Common stock ownership percentage	67.50%
Private SELLAS Security Holders | Galena Biopharma, Inc
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Common stock conversion ratio	43.9972
Pre-Merger Securityholders
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Common stock ownership percentage	32.50%

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Liquidity (Details) $ / shares in Units, $ in Thousands	Jul. 16, 2018 USD ($) $ / shares shares	May 01, 2018 USD ($)	Mar. 09, 2018 USD ($) $ / shares	Mar. 07, 2018 USD ($) $ / shares shares	Dec. 29, 2017 shares	Sep. 30, 2018 USD ($) tranche $ / shares shares	Dec. 31, 2017 USD ($) shares	Sep. 30, 2017 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Warrants issued (in shares) | shares	11,520,000				316,163
Sale of stock, price per share (in usd per share) | $ / shares	$ 2.10
Exercise price (usd per share) | $ / shares	$ 0.0001
Warrant term	5 years				5 years
Sale of stock, consideration received on transaction	$ 21,600
Preferred stock, shares issued (in shares) | shares						0	0
Cash and cash equivalents						$ 9,968	$ 2,319
Restricted cash and cash equivalents						114	10,431
Other receivable						6,600	0
Litigation settlement insurance recovery						474	$ 0	$ 500
Accounts payable and accrued liabilities						11,900
Long-term debt						$ 100
Series A- Convertible Preferred Stock
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Proceeds from issuance of private placement				$ 10,700
Series A- Convertible Preferred Stock | First Tranche
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Proceeds from issuance of private placement			$ 6,000
Series A- Convertible Preferred Stock | Second Tranche
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Proceeds from issuance of private placement		$ 4,700
Common Stock
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Sale of stock, number of shares issued in transaction | shares	6,845,000
Warrant
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Sale of stock, number of shares issued in transaction | shares	4,675,000
Sale of stock, price per share (in usd per share) | $ / shares	$ 2.0999
Purchase Agreement | Series A Non-voting Convertible
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Warrants issued (in shares) | shares				1,383,631
Warrant term				5 years 6 months
Preferred stock, shares issued (in shares) | shares				10,700
Conversion price (USD per share) | $ / shares						$ 1.00
Purchase Agreement | Series A- Convertible Preferred Stock
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Conversion price (USD per share) | $ / shares			$ 5.80	$ 6.59
Number of tranches | tranche						2

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Basis Of Presentation and Significant Accounting Policies - Components of Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 24, 2018	May 18, 2018	Dec. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2016	May 10, 2016
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 9,968			$ 2,319
Restricted cash and cash equivalents	114			10,431
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	10,082			12,750	$ 2,369		$ 5,962
Corporate Credit Cards
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	$ 100			200
Secured Debt
Cash and Cash Equivalents [Line Items]
Restricted cash		$ 8,500
Amendment Agreement | Secured Debt
Cash and Cash Equivalents [Line Items]
Maximum prepayment of principle if demanded						$ 18,500		$ 18,500
Restricted cash			$ 8,500	$ 10,200

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Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Net loss	$ (9,066)	$ (21,690)
Basic net loss per share (usd per share)	$ (1.61)	$ 4.92
Diluted net loss per share (usd per share)	$ (1.61)	$ 4.92
Conversion of convertible notes	$ 5,800	$ 5,800
Goodwill and intangible assets impairment loss	5,200	5,200
Business acquisition, transaction costs	3,300	3,300
Historical Interest Expense
Business Acquisition [Line Items]
Pro forma adjustments to net loss	$ 200	$ 300

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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liabilities:
Warrants potentially settleable in cash	$ 975	$ 1,309
Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	5,319	1,294
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	6,774	1,662
Restricted cash equivalents		10,245
Total assets measured and recorded at fair value	6,774	11,907
Liabilities:
Warrants potentially settleable in cash	975	1,309
Contingent consideration	5,319	1,294
Total liabilities measured and recorded at fair value	6,294	2,603
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)
Assets:
Cash equivalents	6,774	1,662
Restricted cash equivalents		10,245
Total assets measured and recorded at fair value	6,774	11,907
Liabilities:
Warrants potentially settleable in cash	0	0
Contingent consideration	0	0
Total liabilities measured and recorded at fair value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0	0
Restricted cash equivalents		0
Total assets measured and recorded at fair value	0	0
Liabilities:
Warrants potentially settleable in cash	0	0
Contingent consideration	0	0
Total liabilities measured and recorded at fair value	0	0
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Restricted cash equivalents		0
Total assets measured and recorded at fair value	0	0
Liabilities:
Warrants potentially settleable in cash	975	1,309
Contingent consideration	5,319	1,294
Total liabilities measured and recorded at fair value	$ 6,294	$ 2,603

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Fair Value Measurements (Reconciliation of Level 3 Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value of contingent consideration	$ (162)	$ 0	$ (4,025)	$ 0
Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance Liabilities			1,294
Change in fair value of contingent consideration			4,025
Ending Balance Liabilities	$ 5,319		$ 5,319
Apthera, Inc.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration payable, maximum amount					$ 32,000

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Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Professional fees	$ 2,836	$ 1,744
Compensation and related benefits	808	566
Clinical trial costs	583	51
Value-added tax	158	426
Rebates and returns of former commercial products	22	223
Other	276	191
Accrued expenses and other current liabilities	4,683	3,201
Legal fees	0	$ 1,300
JBG Litigation
Liability for Claims and Claims Adjustment Expense [Line Items]
Legal fees	$ 2,500

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Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current portion of Senior Secured Debenture	$ 76	$ 8,377
Non-current portion of Senior Secured Debenture	0	2,611
Total debt	76	10,988
Secured Debt | Securities Purchase Agreement
Debt Instrument [Line Items]
Current portion of Senior Secured Debenture	0	8,377
Non-current portion of Senior Secured Debenture	0	2,611
Convertible Notes Payable
Debt Instrument [Line Items]
Short-term convertible promissory notes	$ 76	$ 0

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Debt (Senior Secured Debenture) (Details) - USD ($)			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 05, 2018	May 10, 2016	Nov. 14, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Oct. 16, 2018	Sep. 24, 2018	Jul. 16, 2018	May 18, 2018	Dec. 29, 2017	Aug. 31, 2017
Debt Instrument [Line Items]
Warrants issued (in shares)											11,520,000		316,163
Outstanding principal								$ 10,200,000
Principal redeemed						$ 2,800,000
Debt instrument, redemption, principal amount redeemed, shares				659,529		659,529
Debt amount redeemed, settled in cash						$ 600,000
Decrease in restricted cash						1,800,000
Gain on extinguishment of debt				$ 766,000	$ 0	766,000	$ 0
Secured Debt
Debt Instrument [Line Items]
Fixed coupon rate		9.00%
Restricted cash										$ 8,500,000
Balance of restricted cash over senior secured debenture										$ 1,600,000
Securities Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Fixed coupon rate		6.375%
Principal amount of debt		$ 25,530,000
Warrants issued (in shares)		3,333
Proceeds from issuance of debt and warrants		$ 23,400,000
Amendment Agreement | Secured Debt
Debt Instrument [Line Items]
Final payment of interest						$ 800,000		800,000
Debt instrument, covenant, compensating cash balance		$ 18,500,000												$ 18,500,000
Restricted cash								$ 10,200,000				$ 8,500,000
Subsequent Event
Debt Instrument [Line Items]
Deposit of restricted cash over senior secured debenture									$ 1,600,000
JGB Action | Subsequent Event
Debt Instrument [Line Items]
Restricted cash	$ 1,600,000
Balance of restricted cash over senior secured debenture	1,600,000
Loss contingency, damages awarded, value	6,600,000
Gain on reimbursement of legal fees	5,000,000
Gain on extinguishment of debt	$ 800,000		$ 800,000

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Debt (Convertible Debt) (Details) - USD ($)	1 Months Ended	9 Months Ended
	Apr. 30, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Common stock acquired in exchange for warrants (in shares)		412,667
Convertible Notes Payable | Convertible Promissory Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000,000.0
Common stock acquired in exchange for warrants (in shares)		412,667
Debt instrument, interest rate, stated percentage		5.00%
Debt instrument, convertible, conversion price (in USD per share)		$ 7.00
Warrants and rights outstanding	$ 800,000	$ 100,000
Conversion of units (in shares)	118,644

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Legal Proceedings, Commitments and Contingencies (Details) $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 05, 2018 USD ($)	Oct. 23, 2018 counterclaim	May 18, 2018 USD ($) counterclaim	Jul. 24, 2017 USD ($)	Nov. 14, 2018 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 24, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Gain on extinguishment of debt							$ 766	$ 0	$ 766	$ 0
JGB (Cayman) Newton Ltd
Loss Contingencies [Line Items]
Legal fees							$ 2,500
Loss contingency, number of counterclaims | counterclaim			7
Pending Litigation | Patel vs Galena biopharma, Inc
Loss Contingencies [Line Items]
Payments for legal settlement				$ 50
Litigation settlement with issuance of common stock				$ 1,250
Secured Debt
Loss Contingencies [Line Items]
Restricted cash											$ 8,500
Secured Debt | Amendment Agreement
Loss Contingencies [Line Items]
Restricted cash			$ 8,500									$ 10,200
Subsequent Event
Loss Contingencies [Line Items]
Litigation settlement insurance recovery						$ 500
Subsequent Event | JGB (Cayman) Newton Ltd
Loss Contingencies [Line Items]
Legal fees					$ 2,500
Restricted cash	$ 1,600
Loss contingency, number of counterclaims | counterclaim		4
Loss contingency, damages awarded, value	6,600
Gain on extinguishment of debt	$ 800				$ 800

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Stockholders' Equity (Narrative) (Details) - USD ($)						3 Months Ended		9 Months Ended
	Jul. 16, 2018	May 01, 2018	Mar. 09, 2018	Mar. 07, 2018	Dec. 29, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	May 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						5,000,000		5,000,000			5,000,000
Preferred stock, par value (usd per share)						$ 0.0001		$ 0.0001			$ 0.0001
Preferred stock, shares issued (in shares)						0		0			0
Warrants issued (in shares)	11,520,000				316,163
Proceeds from issuance of preferred stock, preference stock, and warrants								$ 9,647,000	$ 0
Shares issued upon conversion (in shares)	3,748,184
Convertible preferred stock converted to other securities	$ 7,871,186
Exercise price (usd per share)	$ 2.10				$ 7.42					$ 6.59
Increase (decrease) in fair value of warrant liability						$ 500,000		491,000	0
Warrant term	5 years				5 years
Deemed dividend arising from the issuance of common stock to Series A convertible preferred stockholders under most favored nation provision						$ 8,654,000	$ 0	$ 8,654,000	$ 0
Common stock, shares authorized (in shares)						350,000,000		350,000,000			350,000,000
Common stock, par value (usd per share)						$ 0.0001		$ 0.0001			$ 0.0001
Sale of stock, price per share (in usd per share)	$ 2.10
Common stock warrant, shares to purchase	1
Exercise price (usd per share)	$ 0.0001
Sale of stock, consideration received on transaction	$ 21,600,000
Purchase Agreement | Private Placement First Closing
Class of Stock [Line Items]
Warrants issued shares (in shares)			774,186
Series A Non-voting Convertible | Purchase Agreement
Class of Stock [Line Items]
Preferred stock, par value (usd per share)				$ 0.0001
Preferred stock, shares issued (in shares)				10,700
Warrants issued (in shares)				1,383,631
Proceeds from issuance of preferred stock, preference stock, and warrants				$ 10,700,000
Shares issued upon conversion (in shares)				1,844,835
Conversion price (USD per share)						$ 1.00		$ 1.00
Warrant term				5 years 6 months
Series A- Convertible Preferred Stock | Private Placement First Closing
Class of Stock [Line Items]
Deemed dividend on beneficial conversion feature of convertible preferred stock		$ 2,500,000	$ 2,000,000
Series A- Convertible Preferred Stock | Purchase Agreement
Class of Stock [Line Items]
Conversion price (USD per share)			$ 5.80	$ 6.59
Series A- Convertible Preferred Stock | Purchase Agreement | Private Placement First Closing
Class of Stock [Line Items]
Proceeds from issuance of preferred stock, preference stock, and warrants			$ 6,000,000
Convertible preferred stock issued shares (in shares)			5,987
Series A- Convertible Preferred Stock | Purchase Agreement | Private Placement Second Closing
Class of Stock [Line Items]
Proceeds from issuance of preferred stock, preference stock, and warrants			$ 4,700,000
Convertible preferred stock issued shares (in shares)			4,713
Warrants issued shares (in shares)			609,445
Warrant
Class of Stock [Line Items]
Shares issued upon conversion (in shares)	3,748,184
Sale of stock, number of shares issued in transaction	4,675,000
Sale of stock, price per share (in usd per share)	$ 2.0999
Common Stock
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction	6,845,000

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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Details) - shares shares in Thousands	Sep. 30, 2018	Dec. 31, 2017
Equity [Abstract]
Warrants outstanding (in shares)	19,224	963
Stock options outstanding (in shares)	434	10
Options reserved for future issuance under the Company's 2017 Incentive Plan (in shares)	381
Shares reserved for future issuance under the Employee Stock Purchase Plan (in shares)	115
Restricted stock units (in shares)	13
Total reserved for future issuance (in shares)	20,167

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Warrants to Acquire Shares of Common Stock (Schedule of Warrant Activity) (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2018 shares
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	963
Granted (in shares)	21,327
Exercised (in shares)	(2,525)
Canceled/Expired (in shares)	(541)
Warrants outstanding , Ending balance (in shares)	19,224
July 2018 Offering
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	0
Granted (in shares)	15,268
Exercised (in shares)	0
Canceled/Expired (in shares)	0
Warrants outstanding , Ending balance (in shares)	15,268
Pre-funded 2018 Offering
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	0
Granted (in shares)	4,675
Exercised (in shares)	(2,525)
Canceled/Expired (in shares)	0
Warrants outstanding , Ending balance (in shares)	2,150
Series A Convertible Preferred
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	0
Granted (in shares)	1,384
Exercised (in shares)	0
Warrants outstanding , Ending balance (in shares)	1,384
2017 Equilibria
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	316
Granted (in shares)	0
Exercised (in shares)	0
Warrants outstanding , Ending balance (in shares)	316
Galena February 2017
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	567
Granted (in shares)	0
Exercised (in shares)	0
Canceled/Expired (in shares)	(535)
Warrants outstanding , Ending balance (in shares)	32
Galena Other
Class of Warrant or Right, Outstanding [Roll Forward]
Warrants outstanding , Beginning balance (in shares)	80
Granted (in shares)	0
Exercised (in shares)	0
Canceled/Expired (in shares)	(6)
Warrants outstanding , Ending balance (in shares)	74

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Warrants to Acquire Shares of Common Stock (Narrative) (Details)	1 Months Ended	9 Months Ended
	Apr. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares	Jul. 16, 2018 $ / shares	May 31, 2018 $ / shares	Dec. 29, 2017 $ / shares
Class of Warrant or Right [Line Items]
Shares issued for cancellation of warrants (in shares)		54,613
Surrender and cancellation of warrants (in shares)		121,667
Common stock acquired in exchange for warrants (in shares)		412,667
Fair value of consideration exchanged | $		$ 1,200,000
Exercise price (usd per share) | $ / shares			$ 2.10	$ 6.59	$ 7.42
Series A Convertible Preferred
Class of Warrant or Right [Line Items]
Exercise price (usd per share) | $ / shares		$ 6.59
Convertible Promissory Notes | Convertible Notes Payable
Class of Warrant or Right [Line Items]
Debt instrument, face amount | $		$ 1,000,000.0
Common stock acquired in exchange for warrants (in shares)		412,667
Warrants and rights outstanding | $	$ 800,000	$ 100,000
Conversion of units (in shares)	118,644
Measurement Input, Price Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input					0.9010
Measurement Input, Risk Free Interest Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input		0			0.0220
Measurement Input, Expected Dividend Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input		0			0

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Warrants to Acquire Shares of Common Stock (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Details) - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	19,224	963
Series A Convertible Preferred
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	1,384	0
Strike price (in usd per share)	$ 2.10
Expected term (years)	5 years 4 days
Volatility %	83.18%
Risk-free rate %	2.94%
Galena February 2017
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	32	567
Strike price (in usd per share)	$ 33	$ 13
Expected term (years)	3 years 4 months 17 days	4 years 1 month 13 days
Volatility %	85.39%	79.29%
Risk-free rate %	2.25%	2.09%
Galena Other
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	74	80
Strike price (in usd per share)	$ 888.22	$ 28.4
Expected term (years)	2 years 8 months 5 days	3 years 2 months 9 days
Volatility %	85.96%	74.05%
Risk-free rate %	2.32%	2.09%

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Warrants to Acquire Shares of Common Stock (Changes in Fair Value of Warrant Liability) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, Beginning balance	$ 1,309
Fair value of warrants granted	5,039
Fair value of warrants canceled	(524)
Adjustment to exercise price of warrants	491
Change in fair value of warrants	(5,340)
Warrant liability, Ending balance	975
Series A Convertible Preferred
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, Beginning balance	0
Fair value of warrants granted	5,039
Fair value of warrants canceled	0
Adjustment to exercise price of warrants	491
Change in fair value of warrants	(4,558)
Warrant liability, Ending balance	972
Galena February 2017
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, Beginning balance	1,305
Fair value of warrants granted	0
Fair value of warrants canceled	(524)
Adjustment to exercise price of warrants	0
Change in fair value of warrants	(778)
Warrant liability, Ending balance	3
Galena Other
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, Beginning balance	4
Fair value of warrants granted	0
Fair value of warrants canceled	0
Adjustment to exercise price of warrants	0
Change in fair value of warrants	(4)
Warrant liability, Ending balance	$ 0

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Warrants to Acquire Shares of Common Stock (Warrants Classified as Equity) (Details)	Jul. 16, 2018 $ / shares shares	Dec. 29, 2017 year $ / shares shares	Sep. 30, 2018	May 31, 2018 $ / shares
Class of Warrant or Right [Line Items]
Warrants issued (in shares) | shares	11,520,000	316,163
Exercise price (usd per share)	$ 2.10	$ 7.42		$ 6.59
Warrant term	5 years	5 years
Fair value of warrants granted, per share		$ 5.60
Measurement Input, Price Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input		0.9010
Measurement Input, Expected Term
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input | year		5
Measurement Input, Risk Free Interest Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input		0.0220	0
Measurement Input, Expected Dividend Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input		0	0

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 01, 2018	Dec. 29, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, grants in period, net of forfeitures (in shares)			0		0
Weighted average exercise price, granted (USD per share)				$ 3.73
Averages contractual term				10 years
Expected dividend yield				0.00%
Unrecognized compensation cost				$ 1.2
Operating expenses weighted average period				2 years 5 months 16 days
Closing price of the Company's common stock (in USD per share)			$ 1.22	$ 1.22
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, vesting period				3 years
Equity instruments other than options, outstanding, number (in shares)			13,000	13,000		13,000
Equity instruments other than options, outstanding, weighted average grant date fair value (in USD per share)			$ 52.94	$ 52.94		$ 52.94
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average vesting term				6 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average vesting term				4 years
2017 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)			381,000	381,000
Options expire from date of grant		10 years
Percentage increase in number of shares available for future issuance under stock based awards		4.00%
Number of additional shares authorized (in shares)	805,000
Options, grants in period, net of forfeitures (in shares)						0
2017 Equity Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance (in shares)		575,000
Incentive Plan 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options assumed in merger (in shares)		10,171

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Stock-Based Compensation (Allocated Stock-based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share based compensation expense	$ 136	$ 1,267	$ 284	$ 3,776
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share based compensation expense	21	543	55	729
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share based compensation expense	$ 115	$ 724	$ 229	$ 3,047

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Stock-Based Compensation (Assumptions for Option Grants Issued) (Details)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk free interest rate	2.73%
Volatility	80.83%
Expected lives (years)	6 years 2 months 12 days
Expected dividend yield	0.00%

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Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (in shares)	10	434	434
Granted (in shares)		483
Canceled (in shares)		(59)
Options outstanding, ending balance (in shares)	10	434
Exercisable (in shares)			43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance (usd per share)		$ 1,240.55
Weighted average exercise price, granted (usd per share)		5.24
Weighted average exercise price, canceled (use per share)		5.24
Weighted average exercise price, ending balance (usd per share)	$ 1,240.55	$ 34.17
Weighted average exercise price, exercisable (usd per share)			$ 265.35
Weighted average remaining contractual term, options exercisable (in years)	1 year	7 years 6 months 4 days
Weighted average remaining contractual term, outstanding (in years)		9 years 3 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]
Stock options activity, aggregate intrinsic value, beginning balance		$ 0
Stock options activity, aggregate intrinsic value, granted		0
Stock options activity, aggregate intrinsic value, canceled		0
Stock options activity, aggregate intrinsic value, ending balance	$ 0	$ 0
Stock options activity, aggregate intrinsic value, exercisable			$ 0