10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

______________________________

FORM 10-Q

________________________________

(Mark One)
☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended March 31, 2022 or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                             to

Commission File Number: 001-38468

______________________________

Inspire Medical Systems, Inc.

(Exact name of registrant as specified in its charter)

______________________________

Delaware	26-1377674
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
5500 Wayzata Blvd., Suite 1600 Golden Valley, MN	55416
(Address of principal executive offices)	(Zip Code)

(844) 672-4357

(Registrant's telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.001 par value per share	INSP	New York Stock Exchange

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

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

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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.

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

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

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

As of April 26, 2022, the registrant had 27,591,115 shares of common stock, $0.001 par value per share, outstanding.

Table of Contents

		Page
	Forward-Looking Statements	3
PART I.	FINANCIAL INFORMATION	5
Item 1.	Financial Statements	5
	Balance Sheets	5
	Statements of Operations and Comprehensive Loss	6
	Statements of Stockholders' Equity	7
	Statements of Cash Flows	8
	Notes to Financial Statements	9
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	33
Item 4.	Controls and Procedures	33
PART II.	OTHER INFORMATION	34
Item 1.	Legal Proceedings	34
Item 1A.	Risk Factors	34
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3.	Defaults Upon Senior Securities	34
Item 4.	Mine Safety Disclosures	34
Item 5.	Other Information	34
Item 6.	Exhibits	35
	Signatures	36

2

FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act of 1933, as amended (the "Securities Act") and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). All statements other than statements of historical facts contained in this Quarterly Report are forward-looking statements, including statements regarding our future results of operations and financial position, business strategy, the impact of the ongoing and global COVID-19 pandemic on our business, financial results and financial position, prospective products, international product approvals and commercializations, our expectations regarding the final reimbursement levels for Inspire therapy procedures, research and development costs, timing and likelihood of success, other insurance providers' plans to begin approving our Inspire therapy, and the plans and objectives of management for future operations.

In some cases, you can identify forward-looking statements by terms such as ‘‘may,’’ ‘‘will,’’ ‘‘should,’’ ‘‘expect,’’ ‘‘plan,’’ ‘‘anticipate,’’ ‘‘could,’’ ‘‘intend,’’ ‘‘target,’’ ‘‘project,’’ ‘‘contemplate,’’ ‘‘believe,’’ ‘‘estimate,’’ ‘‘predict,’’ ‘‘potential’’ or ‘‘continue’’ or the negative of these terms or other similar expressions, although not all forward-looking statements contain these words. The forward-looking statements in this Quarterly Report are only predictions and are based largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition, and results of operations. These forward-looking statements speak only as of the date of this Quarterly Report and are subject to a number of known and unknown risks, uncertainties, and assumptions, including, but not limited to:

•our history of operating losses and dependency on our Inspire system for revenues;

•commercial success and market acceptance of our Inspire therapy;

•our ability to achieve and maintain adequate levels of coverage or reimbursement for our Inspire system or any future products we may seek to commercialize;

•competitive companies and technologies in our industry;

•the impact on our business, financial condition, and results of operation from the ongoing and global COVID-19 pandemic, or any other pandemic, epidemic or outbreak of an infectious disease;

•our ability to expand our indications and develop and commercialize additional products and enhancements to our Inspire system;

•future results of operations, financial position, research and development costs, capital requirements, and our needs for additional financing;

•our ability to forecast customer demand for our Inspire system and manage our inventory;

•our dependence on third-party suppliers and contract manufacturers;

•risks related to consolidation in the healthcare industry;

•our ability to expand, manage, and maintain our direct sales and marketing organization, and to market and sell our Inspire system in markets outside of the United States;

•our ability to manage our growth;

•our ability to hire and retain our senior management and other highly qualified personnel;

•risks related to product liability claims and warranty claims;

•our ability to address quality issues that may arise with our Inspire system;

3

•our ability to successfully integrate any acquired business, products or technologies;

•changes in global macroeconomic conditions;

•any failure of key information technology systems, processes or sites or damage to or inability to access our physical facilities;

•our ability to commercialize or obtain regulatory approvals or certifications for our Inspire therapy and system, or the effect of delays in commercializing or obtaining regulatory approvals or certifications;

•any violations of anti-bribery, anti-corruption, and anti-money laundering laws;

•risks related to our indebtedness;

•our ability to use our net operating losses and research and development carryforwards;

•the risk that we may be deemed to be an investment company under the Investment Company Act of 1940;

•United States Food and Drug Administration or other United States or foreign regulatory actions affecting us or the healthcare industry generally, including healthcare reform measures in the United States and international markets;

•our ability to establish and maintain intellectual property protection for our Inspire therapy and system or avoid claims of infringement;

•risks related to our common stock; and

•other important factors that could cause actual results, performance or achievements to differ materially from those contemplated that are found in "Part I, Item 1. Business," "Part I, Item 1A. Risk Factors," and "Part I, Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, as updated by “Part I, Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Quarterly Report on Form 10-Q.

Moreover, we operate in an evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict all risk factors and uncertainties.

You should read this Quarterly Report and the documents that we reference in this Quarterly Report completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

Unless the context requires otherwise, references to “Inspire,” the “Company,” “we,” “us,” and “our,” refer to Inspire Medical Systems, Inc.

4

PART I—FINANCIAL INFORMATION

Item 1.    Financial Statements.

INSPIRE MEDICAL SYSTEMS, INC.

BALANCE SHEETS

(in thousands, except share and per share amounts)

	March 31, 2022		December 31, 2021
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	203,291	$	214,467
Accounts receivable, net of allowance for credit losses of     $99 and $99, respectively	34,544		34,179
Inventories	22,198		17,231
Prepaid expenses and other current assets	2,444		2,660
Total current assets	262,477		268,537
Investments, long-term	9,796		9,938
Property and equipment, net	9,334		8,486
Operating lease right-of-use asset	7,659		7,919
Other non-current assets	454		204
Total assets	$	289,720	$	295,084
Liabilities and stockholders' equity
Current liabilities:
Accounts payable	$	17,022	$	11,665
Accrued expenses	13,896		20,454
Notes payable, current portion	12,250		9,188
Total current liabilities	43,168		41,307
Notes payable, non-current portion	12,798		15,799
Operating lease liability, non-current portion	8,553		8,796
Other non-current liabilities	146		134
Total liabilities	64,665		66,036
Stockholders' equity:
Preferred Stock, $0.001 par value, 10,000,000 shares authorized; no shares      issued and outstanding	—		—
Common Stock, $0.001 par value per share; 200,000,000 shares authorized; 27,568,004 and 27,416,106 issued and outstanding at March 31, 2022 and December 31, 2021, respectively	28		27
Additional paid-in capital	521,308		508,465
Accumulated other comprehensive loss	(198)		(55)
Accumulated deficit	(296,083)		(279,389)
Total stockholders' equity	225,055		229,048
Total liabilities and stockholders' equity	$	289,720	$	295,084

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

5

INSPIRE MEDICAL SYSTEMS, INC.

STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited)

(in thousands, except share and per share amounts)

	Three Months Ended March 31,
	2022		2021
Revenue	$	69,382	$	40,352
Cost of goods sold	10,004		5,981
Gross profit	59,378		34,371
Operating expenses:
Research and development	11,870		8,154
Selling, general and administrative	63,564		41,906
Total operating expenses	75,434		50,060
Operating loss	(16,056)		(15,689)
Other expense (income):
Interest income	(34)		(57)
Interest expense	527		523
Other expense, net	45		38
Total other expense	538		504
Loss before income taxes	(16,594)		(16,193)
Income taxes	100		23
Net loss	(16,694)		(16,216)
Other comprehensive loss:
Unrealized loss on investments	(143)		(20)
Total comprehensive loss	$	(16,837)	$	(16,236)
Net loss per share, basic and diluted	$	(0.61)	$	(0.60)
Weighted average common shares used to    compute net loss per share, basic and diluted	27,517,268		27,144,361

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

6

INSPIRE MEDICAL SYSTEMS, INC.

STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited)

(in thousands, except share amounts)

	Three Months Ended March 31, 2022
	Common Stock
	Shares	Amount		Additional Paid-In Capital		Accumulated Other Comprehensive Loss		Accumulated Deficit		Total Stockholders' Equity
Balance at December 31, 2021	27,416,106	$	27	$	508,465	$	(55)	$	(279,389)	$	229,048
Stock options exercised	151,186	1		3,086		—		—		3,087
Vesting of restricted stock units	569	—		—		—		—		—
Withholding taxes on net share settlement of restricted stock units	(205)	—		(43)		—		—		(43)
Issuance of common stock	348	—		79		—		—		79
Stock-based compensation expense	—	—		9,721		—		—		9,721
Other comprehensive loss	—	—		—		(143)		—		(143)
Net loss	—	—		—		—		(16,694)		(16,694)
Balance at March 31, 2022	27,568,004	$	28	$	521,308	$	(198)	$	(296,083)	$	225,055

	Three Months Ended March 31, 2021
	Common Stock
	Shares	Amount		Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Total Stockholders' Equity
Balance at December 31, 2020	27,069,276	$	27	$	467,038	$	29	$	(237,347)	$	229,747
Stock options exercised	133,421	—		3,550		—		—		3,550
Issuance of common stock	376	—		73		—		—		73
Stock-based compensation expense	—	—		5,997		—		—		5,997
Other comprehensive loss	—	—		—		(20)		—		(20)
Net loss	—	—		—		—		(16,216)		(16,216)
Balance at March 31, 2021	27,203,073	$	27	$	476,658	$	9	$	(253,563)	$	223,131

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

7

INSPIRE MEDICAL SYSTEMS, INC.

STATEMENTS OF CASH FLOWS (Unaudited)

(in thousands)

	Three Months Ended March 31,
	2022		2021
Operating activities
Net loss	$	(16,694)	$	(16,216)
Adjustments to reconcile net loss:
Depreciation and amortization	359		234
(Accretion) amortization of investment (discount) premium	(1)		30
Accretion of debt discount	62		58
Non-cash lease expense	260		171
Stock-based compensation expense	9,721		5,997
Non-cash stock issuance for services rendered	79		73
Other, net	—		(8)
Changes in operating assets and liabilities:
Accounts receivable	(382)		3,381
Inventories	(4,967)		(2,905)
Prepaid expenses and other current assets	216		356
Accounts payable	5,520		1,477
Accrued expenses and other liabilities	(6,921)		(3,049)
Net cash used in operating activities	(12,748)		(10,401)
Investing activities
Purchases of property and equipment	(1,215)		(1,321)
Purchases of other investments	(250)		—
Net cash used in investing activities	(1,465)		(1,321)
Financing activities
Proceeds from the exercise of stock options	3,087		3,550
Taxes paid on net share settlement of restricted stock units	(43)		—
Net cash provided by financing activities	3,044		3,550
Effect of exchange rate on cash	(7)		2
Decrease in cash and cash equivalents	(11,176)		(8,170)
Cash and cash equivalents at beginning of period	214,467		190,518
Cash and cash equivalents at end of period	$	203,291	$	182,348
Supplemental cash flow information
Cash paid for interest	$	466	$	466
Change in property and equipment acquired but not yet paid	284		1,209

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

8

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

1. Organization

Description of Business

Inspire Medical Systems, Inc. is a medical technology company focused on the development and commercialization of innovative, minimally invasive solutions for patients with obstructive sleep apnea ("OSA"). Our proprietary Inspire system is the first and only United States ("U.S.") Food and Drug Administration ("FDA") approved neurostimulation technology that provides a safe and effective treatment for moderate to severe OSA. Inspire therapy received premarket approval ("PMA") from the FDA in 2014 and has been commercially available in certain European markets since 2011. Japan's Ministry of Health, Labour and Welfare ("MLHW") approved Inspire therapy to treat moderate to severe OSA in 2018 and was formally added to the Japan National Health Insurance Payment Listing in 2021. In 2020, the Australian Therapeutic Goods Administration approved Inspire therapy to treat moderate to severe OSA, and we are currently seeking reimbursement coverage in Australia.

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial reporting and as required by the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including those which are normal and recurring) considered necessary for a fair presentation of the interim financial information have been included. When preparing financial statements in conformity with GAAP, we must make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures at the date of the financial statements. Actual results could differ from those estimates. Additionally, the results of operations for the interim periods are not necessarily indicative of the operating results for the full fiscal year or any future periods. For a complete discussion of our significant accounting policies and other information, the unaudited financial statements and notes thereto should be read in conjunction with the audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Cash and Cash Equivalents

We consider all highly liquid securities, readily convertible to cash, that have original maturities of 90 days or less from the date of purchase to be cash equivalents. The carrying amount reported in the balance sheets for cash is cost, which approximates fair value.

Foreign Currency

Sales and expenses denominated in foreign currencies are translated at average exchange rates in effect throughout the year. Foreign currency transaction gains and losses are included in other expense, net, in the statements of operations and comprehensive loss. Assets and liabilities of foreign operations are remeasured at period-end exchange rates with the impacts of foreign currency remeasurement recognized in other expense, net in the statements of operations and comprehensive loss.

Investments

At both March 31, 2022 and December 31, 2021, our long-term investments consisted of U.S. government securities. Investments are reported at their estimated fair market values which are based on quoted, active or inactive market prices when available. Any unrealized gains and losses due to interest rate fluctuations and other external factors are reported as a separate component of accumulated other comprehensive loss. We had $0.2 million and $0.1 million of unrecognized loss in accumulated other comprehensive loss at March 31, 2022 and

9

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

December 31, 2021, respectively. Any realized gains and losses are calculated on the specific identification method and reported net in other expense, net in the statements of operations and comprehensive loss. For both of the three months ended March 31, 2022 and 2021, we recognized $0 of realized gains, net.

We reassess our estimated credit losses on investments each reporting period. U.S. government securities and cash equivalents are under a "zero-loss exception" for credit losses, meaning no credit loss risk calculation is necessary on those instruments due to the exceptionally low rate of default, which continues to decrease as the securities approach maturity, which for us is no longer than two years. We record changes in the allowance for credit losses for available-for-sale debt securities with a corresponding adjustment in credit loss expense on the statement of operations and comprehensive loss. No reversal of a previously recorded allowance for credit losses may be made to an amount below zero. The total allowance for credit losses was $0 at both March 31, 2022 and December 31, 2021.

Fair Value of Financial Instruments

We measure certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents and investments. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. A three-tier fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value:

Level 1: Observable inputs, such as quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2: Inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activities, which would require us to develop our own assumptions.

We use the methods and assumptions described below in determining the fair value of our financial instruments.

Money market funds: Fair values of money market funds are based on quoted market prices in active markets. These are included as Level 1 measurements in the tables below.

U.S. government securities: Consists of U.S. government Treasury bills with original maturities of less than two years. These are included as a Level 1 measurement in the tables below.

The following tables set forth by level within the fair value hierarchy our assets that are measured on a recurring basis and reported at fair value as of March 31, 2022 and December 31, 2021. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

10

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

	Fair Value Measurements as of
	March 31, 2022
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,379	$	189,379	$	—	$	—
Total cash equivalents	189,379		189,379		—		—
Investments:
U.S. government securities	9,796		9,796		—		—
Total investments	9,796		9,796		—		—
Total cash equivalents and investments	$	199,175	$	199,175	$	—	$	—

	Fair Value Measurements as of
	December 31, 2021
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,369	$	189,369	$	—	$	—
Total cash equivalents	189,369		189,369		—		—
Investments:
U.S. government securities	9,938		9,938		—		—
Total investments	9,938		9,938		—		—
Total cash equivalents and investments	$	199,307	$	199,307	$	—	$	—

There were no transfers between levels during the periods ended March 31, 2022 and December 31, 2021.

Concentration of Credit Risk

Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash equivalents, investments, and accounts receivable.

Our investment policy limits investments to certain types of debt securities issued by the U.S. government and its agencies, corporations with investment-grade credit ratings, or commercial paper and money market funds issued by the highest quality financial and non-financial companies. We place restrictions on maturities and concentration by type and issuer. We are exposed to credit risk in the event of a default by the issuers of these securities to the extent recorded on the balance sheets. However, as of March 31, 2022 and December 31, 2021, we limited our credit risk associated with cash equivalents by placing investments with banks we believe are highly creditworthy.

We believe that the credit risk in our accounts receivable is mitigated by our credit evaluation process, relatively short collection terms, and dispersion of our customer base. We generally do not require collateral, and losses on accounts receivable have historically not been significant.

Accounts Receivable and Allowance for Expected Credit Losses

Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Customer credit terms are established prior to shipment with the general standard being net 30 days. Collateral or any other security to support payment of these receivables generally is not required.

11

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

Each reporting period, we estimate the credit loss related to accounts receivable based on a migration analysis of accounts grouped by individual receivables delinquency status, and apply our historic loss rate adjusted for management's assumption of future market conditions. Any change in the allowance from new receivables acquired, or changes due to credit deterioration on previously existing receivables, is recorded in selling, general and administrative expenses. Write-offs of receivables considered uncollectible are deducted from the allowance. Specific accounts receivable are written-off once a determination is made that the amount is uncollectible. The write-off is recorded in the period in which the account receivable is deemed uncollectible. Recoveries are recognized when received and as a direct credit to earnings or as a reduction to the allowance for credit losses (which would indirectly reduce the loss by decreasing bad debt expense).

Inventories

Inventories are valued at the lower of cost or net realizable value, computed on a first-in, first-out basis and consisted of the following:

	March 31, 2022		December 31, 2021
Raw materials	$	5,342	$	3,119
Finished goods	16,856		14,112
Total inventories, net of reserves	$	22,198	$	17,231

We regularly review inventory quantities on-hand for excess and obsolete inventory and, when circumstances indicate, incur charges to write down inventories to their net realizable value. The determination of a reserve for excess and obsolete inventory involves management exercising judgment to determine the required reserve, considering future demand, product life cycles, introduction of new products and current market conditions. The reserve for excess and obsolete inventory was $0.4 million and $0.3 million as of March 31, 2022 and December 31, 2021, respectively.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization and consisted of the following:

	March 31, 2022		December 31, 2021
Computer equipment and software	$	1,500	$	1,397
Manufacturing equipment	5,238		4,436
Other equipment	311		249
Leasehold improvements	281		281
Construction in process	5,415		5,175
Property and equipment, cost	12,745		11,538
Less: accumulated depreciation and amortization	(3,411)		(3,052)
Property and equipment, net	$	9,334	$	8,486

Depreciation is determined using the straight-line method over the estimated useful lives of the respective assets, generally three to five years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the term of the lease. Depreciation and amortization expense was $0.4 million and $0.2 million for the three months ended March 31, 2022 and 2021, respectively.

Impairment of Long-lived Assets

Long-lived assets consist primarily of property and equipment and operating lease right-of-use asset and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an

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INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

asset may not be recoverable. If circumstances require that an asset be tested for possible impairment, we compare the undiscounted cash flows expected to be generated by the asset to the carrying amount of the asset. If the carrying amount of the asset is not recoverable on an undiscounted cash flow basis, we determine the fair value of the asset and recognize an impairment loss to the extent the carrying amount of the asset exceeds its fair value. We determine fair value using the income approach based on the present value of expected future cash flows or other appropriate measures of estimated fair value. Our cash flow assumptions consider historical and forecasted revenue and operating costs and other relevant factors. We did not record any impairment charges on long-lived assets during either of the three months ended March 31, 2022 or 2021.

Accrued Expenses

Accrued expenses consisted of the following:

	March 31, 2022		December 31, 2021
Payroll related	$	10,565	$	17,655
Interest	160		160
Product warranty liability	438		468
Operating lease liability, current portion	673		312
Other accrued expenses	2,060		1,859
Total accrued expenses	$	13,896	$	20,454

The following table shows the changes in our estimated product warranty liability accrual, included in accrued liabilities:

	Three Months Ended March 31,
	2022		2021
Balance at beginning of period	$	468	$	159
Accruals of warranties issued	11		178
Settlements of warranty claims	(41)		(71)
Balance at the end of the period	$	438	$	266

Revenue Recognition

We recognize revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606"). Revenues from product sales are recognized when the customer obtains control of the product, which occurs at a point in time, either upon shipment of the product or receipt of the product, depending on shipment terms. Our standard shipping terms are free on board shipping point, unless the customer requests that control and title to the inventory transfer upon delivery. In those cases where shipping and handling costs are billed to customers, we classify the amounts billed as a component of cost of goods sold.

Revenue is measured as the amount of consideration we expect to receive, adjusted for any applicable estimates of variable consideration and other factors affecting the transaction price, which is based on the invoiced price, in exchange for transferring products. All revenue is recognized when we satisfy our performance obligations under the contract. The majority of our contracts have a single performance obligation and are short term in nature.

Sales taxes and value added taxes in foreign jurisdictions that are collected from customers and remitted to governmental authorities are accounted for on a net basis and therefore are excluded from net sales. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of goods sold.

13

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

Variable consideration related to certain customer sales incentives is estimated based on the amounts expected to be paid based on the agreement with the customer using probability assessments.

We offer customers a limited right of return for our product in case of non-conformity or performance issues. We estimate the amount of our product sales that may be returned by our customers based on historical sales and returns. As our historical product returns to date have been immaterial, we have not recorded a reduction in revenue related to variable consideration for product returns.

See Note 9 for disaggregated revenue by geographic area.

Cost of Goods Sold

Cost of goods sold consists primarily of acquisition costs for the components of the Inspire system, overhead costs, scrap and inventory obsolescence, warranty replacement costs, as well as distribution-related expenses such as logistics and shipping costs, net of shipping costs charged to customers. The overhead costs include the cost of material procurement, depreciation expense for production equipment, and operations supervision and management personnel, including employee compensation, stock-based compensation, supplies, and travel.

Research and Development

Research and development expenses consist primarily of product development, clinical and regulatory affairs, quality assurance, consulting services, and other costs associated with products and technologies in development. These expenses include employee compensation, including stock-based compensation, supplies, materials, consulting, and travel expenses related to research and development programs. Clinical expenses include clinical trial design, clinical site reimbursement, data management, travel expenses, and the cost of manufacturing products for clinical trials.

Stock-Based Compensation

We maintain an equity incentive plan to provide long-term incentives for eligible employees, consultants, and members of the board of directors. The plan allows for the issuance of restricted stock units ("RSUs"), performance stock units ("PSUs"), and non-statutory and incentive stock options to employees, and RSUs, PSU's, and non-statutory stock options to consultants and directors. We also offer an employee stock purchase plan ("ESPP") which allows participating employees to purchase shares of our common stock at a discount through payroll deductions. We have not granted any stock-based awards to our consultants.

We recognize equity-based compensation expense for awards of equity instruments based on the grant date fair value of those awards in accordance with ASC Topic 718, Stock Compensation ("ASC 718"). ASC 718 requires all equity-based compensation awards, including grants of RSUs, PSUs, and stock options, to be recognized as expense in the statements of operations and comprehensive loss based on their grant date fair values. We estimate the fair value of stock options using the Black-Scholes option pricing model and the fair value of RSUs and PSUs is equal to the closing price of our common stock on the grant date. The fair value of each purchase under the employee stock purchase plan is estimated at the beginning of the offering period using the Black-Scholes option pricing model.

Stock-based compensation expense is recognized on a straight-line basis over the vesting term for stock options and RSUs, and over the vesting and performance period based on the probability of achieving the performance objectives for PSUs. We account for award forfeitures as they occur.

Advertising Expenses

We expense the costs of advertising, including promotional expenses, as incurred. Advertising expenses were $15.5 million and $9.0 million during the three months ended March 31, 2022 and 2021, respectively.

14

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

Leases

Operating leases are included in operating lease right-of-use ("ROU") asset, accrued expenses, and operating lease liability – non-current portion in our balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, we use our incremental borrowing rate based on the information available at the lease commencement date as the rate implicit in the lease is not readily determinable. The determination of our incremental borrowing rate requires management judgment based on information available at lease commencement. The operating lease ROU assets also include adjustments for prepayments, accrued lease payments, and exclude lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. Operating lease cost is recognized on a straight-line basis over the expected lease term. Lease agreements entered into after the adoption of ASC 842 that include lease and non-lease components are accounted for as a single lease component. Lease agreements with a noncancelable term of less than 12 months are not recorded on our balance sheets.

Income Taxes

We account for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect when the differences are expected to reverse. Valuation allowances against deferred tax assets are established, when necessary, to reduce deferred tax assets to the amounts expected to be realized. As we have historically incurred operating losses, we have recorded a full valuation allowance against our net deferred tax assets, and there is no provision for income taxes other than minimal state taxes and an accrual for uncertain tax benefits. Our policy is to record interest and penalties expense related to uncertain tax positions as other expense in the statements of operations and comprehensive loss.

Comprehensive Loss

Comprehensive loss consists of net loss and changes in unrealized gains and losses due to interest rate fluctuations and other external factors on investments classified as available-for-sale. Accumulated other comprehensive loss is presented in the accompanying balance sheets as a component of stockholders' equity.

Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Because we have reported a net loss for all periods presented, diluted net loss per share is the same as basic net loss per share as all potentially dilutive shares consisting of outstanding stock options, unvested RSUs and PSUs, and shares issuable under our employee stock purchase plan were antidilutive in those periods.

Recent Accounting Pronouncements

We have reviewed and considered all recent accounting pronouncements that have not yet been adopted and believe there are none that could potentially have a material impact on our business practices, financial condition, results of operations, or disclosures.

15

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

3. Investments

Our investments are classified as available-for-sale and consist of the following:

	March 31, 2022
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,994	$	—	$	(198)	$	9,796
Long-term investments	$	9,994	$	—	$	(198)	$	9,796

	December 31, 2021
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,993	$	—	$	(55)	$	9,938
Long-term investments	$	9,993	$	—	$	(55)	$	9,938

As of March 31, 2022 and December 31, 2021, we had no investments with a contractual maturity of greater than two years. Currently, we do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. We do not consider those investments to be other-than-temporarily impaired as of March 31, 2022. At the end of each reporting period, we evaluate potential credit impairment on available-for-sale securities in an unrealized loss position, based on the expected cash flows to be collected and the yield-to-maturity on those securities. Securities with a valuation allowance for expected credit losses and deemed uncollectible are permanently written-down, and a reversal out of the valuation allowance occurs.

4. Leases

We lease approximately 70,000 square feet of office space for our corporate headquarters under non-cancelable operating leases. The leases expire May 31, 2028 with options to renew for one additional period of five years at the then-prevailing market rate. The exercise of the lease renewal options are at our sole discretion and were not included in the lease term for the calculation of the ROU asset and lease liability when the leases commenced as they were not reasonably certain of exercise.

In addition to base rent, we also pay our proportionate share of the operating expenses, as defined in the leases. These payments are made monthly and adjusted annually to reflect actual charges incurred for operating expenses, such as common area maintenance, taxes, and insurance. In conjunction with the leases, the landlord agreed to provide total rent abatement of $2.3 million.

16

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

The following table presents the lease balances within the balance sheets:

	March 31, 2022		December 31, 2021
Right-of-use assets:
Operating lease right-of-use asset	$	7,659	$	7,919
Operating lease liabilities:
Accrued expenses	673		312
Operating lease liability, non-current portion	8,553		8,796
Total operating lease liabilities	$	9,226	$	9,108

As of March 31, 2022, the remaining lease term was 6.2 years and the weighted average discount rate was 5.3%. The operating cash outflows from our operating leases were less than $0.1 million for both of the three-month periods ended March 31, 2022 and 2021.

5. Long-Term Debt

In March 2019 we amended our $24.5 million term loan and security agreement, which we refer to as our credit facility. The debt was interest only until April 1, 2022 and matures on March 1, 2024. The basic interest rate is the 30-day U.S. LIBOR rate, subject to a floor of 7.60%. The agreement provides a mechanism for determining an alternative interest rate to replace the U.S. LIBOR rate upon the occurrence of certain circumstances. In addition to the principal and interest payments, we are required to pay a final payment fee of 3.50% on all amounts outstanding, which is being accreted using the effective interest rate method over the term of the credit facility and shall be due at the earlier of maturity or prepayment. Borrowings are prepayable at our option in whole, subject to a prepayment fee of 1.00%. As of March 31, 2022, we had $24.5 million outstanding under our credit facility.

The credit facility includes affirmative and restrictive covenants and events of default, including the following events of default: payment defaults, breaches of covenants, judgment defaults, cross defaults to certain other contracts, certain events with respect to governmental approvals if such events could cause a material adverse change, a material impairment in the perfection or priority of the lender's security interest or in the value of the collateral, a material adverse change in the business, operations, or condition of us or any of our subsidiaries, and a material impairment of the prospect of repayment of the loans. Upon the occurrence of an event of default, a default increase in the interest rate of an additional 5.00% could be applied to the outstanding loan balance and the lender could declare all outstanding obligations immediately due and payable and take such other actions as set forth in the loan and security agreement.

Our obligations under the credit facility are secured by a first priority security interest in substantially all of our assets, other than our intellectual property. There are no financial covenants contained in the loan and security agreement. We were in compliance with the affirmative and restrictive covenants as of March 31, 2022.

6. Employee Retirement Plan

We sponsor a defined contribution employee retirement plan covering all of our full-time employees. The plan allows for eligible employees to defer a portion of their eligible compensation up to the maximum allowed by IRS Regulations. Beginning January 1, 2022, we elected to begin making voluntary matching contributions to the plan. We match 50% of the first 6% of each participating employee's contribution, up to 3% of eligible earnings. Our match contributions are made to funds designated by the participant, none of which are based on Inspire common stock. Discretionary contributions to the plan totaled $0.7 million for the three months ended March 31, 2022.

17

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

7. Stock-Based Compensation

We adopted the 2007 Stock Incentive Plan (the "2007 Plan") in November 2007, which terminated in accordance with its terms in November 2017; however, the outstanding stock options may continue to be exercised in accordance with their terms. Immediately following the termination of the 2007 Plan, we adopted the 2017 Stock Incentive Plan (the "2017 Plan"), which contains substantially similar terms and conditions as the 2007 Plan. Upon the IPO, no further grants were made under the 2017 Plan and we adopted the 2018 Stock Incentive Plan (the "2018 Plan").

The purpose of the 2018 Plan is to promote the interest of our company and our stockholders by aiding in attracting and retaining employees, officers, consultants, independent contractors, and directors capable of assuring the future success of our business and to afford such persons an opportunity to acquire a proprietary interest in our company. The board of directors may amend, alter, suspend, discontinue, or terminate the 2018 Plan at any time with the approval of our stockholders. A total of 1,386,809 shares of common stock were initially reserved for issuance under the 2018 Plan, and this share reserve will automatically be supplemented each January 1, commencing on January 1, 2019 and ending on and including January 1, 2028, by an amount of shares equal to the lesser of: a) 739,631 shares, b) 4% of the shares outstanding on the final day of the immediately preceding fiscal year and c) such smaller number of shares as determined by the board of directors. As of March 31, 2022, there were 3,953,906 shares reserved for issuance under the 2018 Plan, of which 1,605,667 shares were available for issuance.

The following table presents the components and classification of stock-based compensation expense:

	Three Months Ended
	March 31,
	2022		2021
Stock options	$	7,761	$	5,657
Restricted stock units	565		19
Performance stock units	1,010		—
Employee stock purchase plan	385		321
Total stock-based compensation expense	$	9,721	$	5,997
Cost of goods sold	$	124	$	79
Research and development	1,767		1,040
Selling, general and administrative	7,830		4,878
Total stock-based compensation expense	$	9,721	$	5,997

Stock-based compensation expense is recognized on a straight-line basis over the vesting term for stock options and RSUs, and over the performance period based on the probability of achieving the performance objectives for PSUs, and is reduced by actual forfeitures as they occur. If there are any modifications or cancellations of the underlying unvested securities, we may be required to accelerate, increase, or cancel any remaining unearned stock compensation expense. Future stock-based compensation expense and unearned stock-based compensation will increase to the extent that we grant additional stock-based awards.

Stock Options

Options are granted at the exercise price, which is equal to the closing price of our stock on the date of grant. The stock options granted to employees include a four-year service period and 25% vest after the first year of service and the remainder vest in equal installments over the next 36 months of service. The stock options granted to the board of directors vest in one or three equal annual installments, in each case, subject to the director's continuous service through the applicable vesting date. The stock options have a contractual life of ten years.

18

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

A summary of stock option activity and related information is as follows:

	Options	Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021	2,646,235		$	80.41	7.1	$397,015
Granted	281,554		$	228.40
Exercised	(151,186)		$	20.74		$29,820
Forfeited/expired	(13,388)		$	160.44
Outstanding at March 31, 2022	2,763,215		$	98.37	7.3	$437,730
Exercisable at March 31, 2022	1,510,689		$	49.56	6.3	$312,906

The aggregate intrinsic value of options exercised is the difference between the estimated fair market value of our common stock at the date of exercise and the exercise price for those options. The aggregate intrinsic value of outstanding options is the difference between the closing price as of the date outstanding and the exercise price of the underlying stock options.

As of March 31, 2022, the amount of unearned stock-based compensation to be expensed from now through the year 2026 related to unvested employee and non-employee director stock options is $94.2 million, which we expect to recognize over a weighted average period of 2.5 years.

We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model using the fair market value of our common stock on the date of grant and a number of other assumptions. These assumptions include estimates regarding the expected term of the awards, estimates of the stock volatility over a duration that approximates the expected term of the awards, estimates of the risk-free rate, and estimates of expected dividend rates.

The fair value of options granted to employees and non-employee directors was estimated as of the grant date using the Black-Scholes option pricing model using the following assumptions:

	Three Months Ended
	March 31,
	2022	2021
Expected term (years)	6.25	6.25
Expected volatility	56.6 - 56.9%	55.2 - 55.7%
Risk-free interest rate	1.75 - 2.40%	0.79 - 1.4%
Expected dividend yield	0.0%	0.0%
Weighted average fair value	$125.75	$109.27

Expected Term — Due to our limited amount of historical exercise, forfeiture, and expiration activity, we have opted to use the "simplified method" for estimating the expected term of options, whereby the expected term equals the arithmetic average of the vesting terms and the original contractual term of the option. We will continue to analyze our expected term assumption as more historical data becomes available.

Expected Volatility — Due to our limited operating history and a lack of company specific historical and implied volatility data, we have incorporated our historical stock trading volatility with those of a group of similar companies that are publicly traded for the calculation of volatility. When selecting this peer group of public companies on which we have based our expected stock price volatility, we generally selected companies with comparable characteristics to it, including enterprise value, stages of clinical development, risk profiles, position within the industry, and with historical share price information sufficient to meet the expected life of the stock-based awards. We will continue to

19

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

analyze the historical stock price volatility assumption as more historical data for our common stock becomes available.

Risk-Free Interest Rate — The risk-free rate assumption is based on the U.S. government Treasury instruments with maturities similar to the expected term of our stock options.

Expected Dividend Yield — The expected dividend assumption is based on our history of not paying dividends and our expectation that we will not declare dividends for the foreseeable future.

Restricted Stock Units

RSUs are share awards that entitle the holder to receive freely tradable shares of our common stock upon vesting. The RSUs cannot be transferred and the awards are subject to forfeiture if the holder’s employment terminates prior to the release of the vesting restrictions. The RSUs generally include a three-year service period and vest in equal installments on each anniversary of the date of grant, provided the employee remains continuously employed with the Company.

A summary of RSUs and related information is as follows:

	Restricted Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	2,275		$	201.51	$	524
Granted	59,496		$	230.60
Vested	(569)		$	201.51
Forfeited	(417)		$	227.53
Unvested at March 31, 2022	60,785		$	229.80	$	15,603

The fair value of the RSUs is equal to the closing price of our common stock on the grant date. The aggregate intrinsic value of RSUs outstanding was based on our closing stock price on the last trading day of the period. As of March 31, 2022, there was $13.4 million of unrecognized stock-based compensation expense related to RSUs that is expected to be recognized over a weighted average period of 2.9 years.

Performance Stock Units

During the quarter ended March 31, 2022, the Company granted PSUs to officers and key employees. The number of PSUs that will ultimately be earned is based on our performance relative to a pre-established goal for the three-year period ending December 31, 2024. The expense is recorded on a straight-line basis over the requisite service period based on an estimate of the number of PSUs expected to vest. Management expectations related to the achievement of the performance goal associated with PSU grants is assessed each reporting period. The number of shares earned at the end of the three-year period will vary based on actual performance, from 0% to 200% of the number of PSUs granted. If the performance condition is not met or not expected to be met, any compensation expense recognized associated with the grant will be reversed.

20

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

A summary of PSUs and related information is as follows:

	Performance Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	—		$	—	$	—
Granted	78,351		$	227.53
Unvested at March 31, 2022	78,351		$	227.53	$	20,112

There were no PSUs granted prior to 2022. The fair value of the PSUs is equal to the closing price of our common stock on the grant date. As of March 31, 2022, there was $23.1 million of unrecognized stock-based compensation expense related to outstanding PSUs that is expected to be recognized over a period of approximately 3.0 years.

Employee Stock Purchase Plan

Our employee stock purchase plan ("ESPP") allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all of our U.S.-based full-time employees. Participating employees may purchase common stock, on a voluntary after-tax basis, at a price equal to 85% of the lower of the closing market price per share of our common stock on the first or last trading day of each stock purchase period. The plan provides for six-month purchase periods, beginning on January 1 and July 1 of each calendar year.

A total of 277,362 shares of common stock were initially reserved for issuance under the ESPP, and this share reserve will automatically be supplemented each January 1, commencing on January 1, 2019 and ending on and including January 1, 2028, by an amount of shares equal to the lesser of: a) 184,908 shares, b) 1% of the shares outstanding on the final day of the immediately preceding calendar year and c) such smaller number of shares as the board of directors may determine. As of March 31, 2022, 929,504 shares were available for future issuance under the ESPP. The current purchase period under the ESPP began on January 1, 2022 and ends June 30, 2022.

8. Income Taxes

At both March 31, 2022 and December 31, 2021, a valuation allowance was recorded against all deferred tax assets due to our cumulative net loss position. We recorded income tax expense of $0.1 million and $0.0 million in the three months ended March 31, 2022 and 2021, respectively. The nominal income tax expense in those periods reflects minimal state income tax expense and an accrual for uncertain tax benefits.

As of December 31, 2021, our gross federal net operating loss carryforward was $286.3 million, which will expire at various dates beginning in 2028. In addition, net operating loss carryforwards for state income tax purposes of $198.2 million that include net operating losses will begin to expire in 2023. We also have gross research and development credit carryforwards of $6.7 million as of December 31, 2021, which will expire at various dates beginning in 2033.

Utilization of the net operating loss carryforwards may be subject to an annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986 and similar state provisions. We have not performed a detailed analysis to determine whether an ownership change has occurred. Such a change of ownership would limit our utilization of the net operating losses and could be triggered by subsequent sales of securities by us or our stockholders.

Realization of the deferred tax assets is dependent upon the generation of future taxable income, if any, the amount and timing of which are uncertain. Based on available objective evidence and cumulative losses, we believe it is more likely than not that the deferred tax assets are not recognizable and will not be recognizable until we have sufficient taxable income. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance.

21

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

We had $0.1 million of gross unrecognized tax benefits as of each of March 31, 2022 and December 31, 2021.

We file income tax returns in the applicable jurisdictions. The 2018 to 2020 tax years remain open to examination by the major taxing authorities to which we are subject. We do not expect a significant change to our unrecognized tax benefits over the next 12 months.

9. Segment Reporting and Revenue Disaggregation

We operate our business as one reporting segment. An operating segment is defined as a component of an enterprise for which separate discrete financial information is available and evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance.

We sell our Inspire system to hospitals and ambulatory surgery centers in the U.S. and in select countries in Europe through a direct sales organization, and in Japan through a distributor. Revenue by geographic region is as follows:

	Three Months Ended
	March 31,
	2022		2021
United States	$	66,426	$	37,769
All other countries	2,956		2,583
Total revenue	$	69,382	$	40,352

All of our long-lived assets are located in the U.S.

10. Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Because we have reported a net loss for all periods presented, diluted net loss per share is the same as basic net loss per share as all of the following potentially dilutive shares were antidilutive in those periods.

The following common stock-based awards were excluded from the computation of diluted net loss per common share for the periods presented because including them would have been anti-dilutive:

	March 31,
	2022	2021
Common stock options outstanding	2,763,215	2,750,375
Unvested restricted stock units	60,785	2,275
Unvested performance stock units	78,351	—
Shares issuable under the ESPP	5,435	5,785
Total	2,907,786	2,758,435

22

INSPIRE MEDICAL SYSTEMS, INC. 

NOTES TO CONDENSED FINANCIAL STATEMENTS (Unaudited) 

(Table amounts in thousands, except share and per share amounts)

11. Subsequent Event

On April 27, 2022, Inspire invested $10.0 million in a minority interest of the private company EnsoData, Inc. This investment is intended to support the advancement of our digital health platform.

23

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

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our financial statements and the related notes to those statements included elsewhere in this Quarterly Report on Form 10-Q, as well as the audited financial statements and the related notes thereto, and the discussion under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021. Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report on Form 10-Q, such as information with respect to our plans and strategy for our business and the impact of the ongoing and global COVID-19 pandemic on our business, financial results and financial condition on our business, financial results and financial condition includes forward-looking statements that involve risks and uncertainties. As a result of many important factors, including those set forth in the "Risk Factors" section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, our actual results could differ materially from the results described in, or implied by, these forward-looking statements.

Overview

We are a medical technology company focused on the development and commercialization of innovative, minimally invasive solutions for patients with OSA. Our proprietary Inspire system is the first and only FDA-approved neurostimulation technology that provides a safe and effective treatment for moderate to severe OSA. We have developed a novel, closed-loop solution that continuously monitors a patient’s breathing and delivers mild hypoglossal nerve stimulation to maintain an open airway. Inspire therapy is indicated for patients with moderate to severe OSA who do not have significant central sleep apnea and do not have a complete concentric collapse of the airway at the soft palate level. In addition, patients in the U.S. and Japan must have been confirmed to fail or be unable to tolerate positive airway pressure treatments, such as CPAP, and be 18 years of age or older, though there are no similar requirements for patients in Europe.

We sell our Inspire system to hospitals and ASCs in the U.S. and in select countries in Europe through a direct sales organization and we sell our Inspire system in Japan through a distributor. Our direct sales force engages in sales efforts and promotional activities focused on ENT physicians and sleep centers. In addition, we highlight our compelling clinical data and value proposition to increase awareness and adoption amongst referring physicians. We build upon this top-down approach with strong direct-to-consumer marketing initiatives to create awareness of the benefits of our Inspire system and drive interest through patient empowerment. This outreach helps to educate thousands of patients on our Inspire therapy.

Although our sales and marketing efforts are directed at patients and physicians because they are the primary users of our technology, we consider the hospitals and ASCs where the procedure is performed to be our customers, as they are the purchasing agents of our Inspire system. Our customers are reimbursed the cost required to treat each patient through various third-party payors, such as commercial payors and government agencies. Our Inspire system is currently reimbursed primarily on a per-patient prior authorization basis for patients covered by commercial payors, under Local Coverage Determinations for patients covered by Medicare, and under U.S. government contract for patients who are treated by the Veterans Health Administration. As of May 3, 2022, we have secured positive coverage policies with many U.S. commercial payors, including virtually all large national commercial insurers, covering approximately 260 million lives in the U.S. In addition, all seven Medicare Administrative Contractors ("MACs") published final policies in 2020 that provide coverage of Inspire therapy when certain coverage criteria are met.

The procedure performed to implant our device was previously described for billing purposes using a Category I Current Procedural Terminology (“CPT”) code (64568), which was used in conjunction with a temporary Category III CPT code (+0466T). At the October 2020 American Medical Association (“AMA”) CPT Editorial Panel meeting, the AMA approved the creation of new Category I CPT codes (64582, 64583, and 64584) to separately identify hypoglossal nerve stimulator services. A new Category I code (42975) was also approved for Drug-Induced Sleep Endoscopy, which is the final procedure to determine which patients are appropriate for Inspire therapy. These new codes went into effect on January 1, 2022. With these approvals, a formal survey was conducted to determine the

24

Medicare reimbursement levels assigned to each code and in November 2021 the final 2022 reimbursement rates were announced by the Centers for Medicare and Medicaid Services (“CMS”). The 2022 national average physician payments are approximately $888 for implantation of a hypoglossal nerve stimulator and approximately $115 for the DISE procedure. The 2022 rates of Medicare reimbursement to our hospital customers is approximately $30,063, an increase of 2% over the 2021 rate. The ASC reimbursement rate for 2022 is approximately $24,828, an increase of 2% over the 2021 rate.

Japan's Ministry of Health, Labour and Welfare ("MLHW") approved Inspire therapy to treat moderate to severe OSA in 2018 and was formally added to the Japan National Health Insurance Payment Listing in 2021. The first implant of Inspire therapy in Japan occurred in February 2022. In 2020, the Australian Therapeutic Goods Administration approved Inspire therapy to treat moderate to severe OSA, and we are currently seeking reimbursement in Australia.

For the three months ended March 31, 2022, 95.7% of our revenue was derived in the U.S. and 4.3% was derived outside of the U.S. No single customer accounted for more than 10% of our revenue during the three months ended March 31, 2022.

We rely on third-party suppliers to manufacture our Inspire system and its components. Many of these suppliers are currently single source suppliers. We have experienced and continue to experience minor supply disruptions during the COVID pandemic, but have managed to avoid any significant supply and inventory issues. We seek to maintain higher levels of inventory to protect ourselves from supply interruptions, and, as a result, we are subject to the risk of inventory obsolescence and expiration, which could lead to inventory impairment charges. In the U.S., our products are shipped directly to our customers on a purchase order basis, primarily by a third-party vendor with a facility in Tennessee, although we do ship some products from our facility in Minnesota. Warehousing and shipping operations for our European customers are handled by a third-party vendor with a facility located in the Netherlands. Shipments of products to our Japanese distributor are handled from our facility in Minnesota. Customers do not have the right to return non-defective product, nor do we place product on consignment. Our sales representatives do not maintain trunk stock.

Since our inception in 2007, we have financed our operations primarily through sales of our Inspire system, private placements of our convertible preferred securities, amounts borrowed under our credit facility and equity offerings of our common stock. We have devoted significant resources to research and development activities related to our Inspire system, including clinical and regulatory initiatives to obtain marketing approval, and sales and marketing activities. For the three months ended March 31, 2022, we generated revenue of $69.4 million with a gross margin of 85.6% and had a net loss of $16.7 million compared to revenue of $40.4 million with a gross margin of 85.2% and a net loss of $16.2 million for the three months ended March 31, 2021. Our accumulated deficit as of March 31, 2022 was $296.1 million.

We have invested heavily in product development. Our research and development activities have been centered on driving continuous improvements to our Inspire therapy. We have also made significant investments in clinical studies to demonstrate the safety and efficacy of our Inspire therapy and to support regulatory submissions. We continue to make investments in research and development efforts to develop our next generation Inspire systems and support our future regulatory submissions for expanded indications and for new markets such as additional European countries and the Asia Pacific region. For example, in December 2021, we received FDA approval for our Bluetooth-enabled patient remote control. In the first quarter of 2021, we received FDA approvals for both a new Inspire physician programmer platform and an improved two-incision surgical implant procedure that eliminates one incision with a revised placement of the pressure sensing lead. In May 2021, we received CE Mark approval in Europe for the two-incision implant procedure. Japan's MLHW approved Inspire therapy to treat moderate to severe OSA in 2018 and was formally added to the Japan National Health Insurance Payment Listing in 2021. In 2020, the Australian Therapeutic Goods Administration approved Inspire therapy to treat moderate to severe OSA.

Our direct-to-consumer marketing includes the use of social media platforms such as Facebook, Google ad placements, and radio and television commercials. In January 2021, we began airing television commercials and in January 2022, we purchased our first national television advertising spots and began airing new TV commercials. The objective of this outreach is to bring patients to our website, where they can find educational materials and

25

videos on sleep apnea and the use and benefits of our Inspire therapy, contact information for physicians and clinical sites, and information regarding community awareness events. Further, our team leverages the Inspire Sleep app for patient education. We expect to continue to increase our direct-to-consumer activities.

In early 2020, we started a call center concept, the Inspire Advisor Care Program ("ACP"). The primary purpose of this program is to assist patients with making a connection with a qualified healthcare provider based on their specific needs. As of March 31, 2022, approximately 600 of our U.S. centers were utilizing the ACP, up from approximately 550 centers at December 31, 2021. We plan to continue to increase the number of our U.S. centers using the ACP.

One of the many benefits of the ACP is the anecdotal feedback we are able to collect from patients during conversations with the ACP representatives. An example of this is the intelligence we have gathered that leads us to believe that we are beginning to see increased patient inquiries about Inspire as a result of the Philips Respironics CPAP recall. Following the recall announcement in July 2021, it took time for patients to learn about the recall, become educated about treatment alternatives and ultimately schedule an appointment with a healthcare provider to determine eligibility for an Inspire procedure. While we cannot quantify the impact from the recall, the feedback from the ACP, as well as prior authorizations data and the Inspire Sleep app, all indicate increased patient flow as a result of the Philips recall. Long term, we believe that there could be a sustained benefit to our business as a result of the recall.

We also continue to make significant investments to build our sales and marketing organization by increasing the number of U.S. and European sales representatives and continuing our direct-to-consumer marketing efforts in existing and new markets throughout the U.S. and in Europe. During the three months ended March 31, 2022, we created 17 new U.S. sales territories, bringing the total to 174 U.S. territories as of March 31, 2022. During that same period, we also activated 74 centers, and deactivated 25 inactive centers, bringing the total to 733 U.S. medical centers implanting Inspire therapy as of March 31, 2022. At March 31, 2022, ASCs made up 22% of our total U.S. implanting centers, consistent with December 31, 2021 .

Because of these and other factors, we may continue to incur net losses for the next several years, and we may require substantial additional funding, which may include future equity and debt financings.

COVID-19 Pandemic Update

Our business, operations, and financial condition and results have been and may continue to be impacted by the COVID-19 pandemic. In 2020, we experienced significant reduction in revenue and product sales, as our customers were negatively impacted by the decline in the volume of elective procedures that resulted from the global healthcare system’s response to COVID-19. During the quarter ended March 31, 2021, resurgences of COVID-19 in various U.S. and European regions disrupted our ability to access our clinician customers and their patients, although surgical volumes generally returned to pre-pandemic levels by the end of the quarter. As 2021 progressed, we observed a diminishing degree of COVID-related impacts to our reported revenue. During the quarter ended March 31, 2022, resurgences of COVID-19 in various U.S. and European regions again impacted our revenue, although, as in the first quarter of 2021, surgical volumes generally returned to pre-pandemic levels by the end of the quarter. We believe there continues to be some adverse impact on our revenues. However, the extent to which the COVID-19 pandemic continues to impact our results of operations and financial condition will depend on future developments that are highly uncertain and cannot be predicted, including new information that may emerge concerning the severity and longevity of COVID-19 and its variants, the resurgence of COVID-19 in regions that have begun to recover from the initial impact of the pandemic, the impact of COVID-19 on economic activity, and the actions to contain its impact on public health and the global economy.

To date, we have not experienced significant disruptions to our supply chain network as a result of the COVID-19 pandemic. We have also not reduced our capital expenditures and are continuing to invest in research and development, however, we may determine to allocate resources differently due to impacts of the COVID-19 pandemic.

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Components of Our Results of Operations

Revenue

We derive primarily all of our revenue from the sale of our Inspire system to hospitals and ASCs in the U.S., select countries in Europe, and Japan. We recognize revenues from sales of our Inspire system when the customer obtains control of the product, which occurs at a point in time, either upon shipment of the product or receipt of the product, depending on shipment terms.

Our revenue has fluctuated, and may continue to fluctuate, from quarter to quarter due to a variety of factors. For example, we have historically experienced seasonality in our first and fourth quarters and have experienced adverse impacts on our revenue due to the COVID-19 pandemic.

Cost of Goods Sold and Gross Margin

Cost of goods sold consists primarily of acquisition costs for the components of the Inspire system, overhead costs, scrap, and inventory obsolescence, warranty replacement costs, as well as distribution-related expenses such as logistics and shipping costs, net of shipping costs charged to customers. The overhead costs include the cost of material procurement, depreciation expense for production equipment, and operations supervision and management personnel, including employee compensation, stock-based compensation, supplies, and travel. We expect cost of goods sold to increase or decrease in absolute dollars primarily as, and to the extent, our revenue grows or declines, respectively.

We calculate gross margin as gross profit divided by revenue. Our gross margin has been and we expect it will continue to be affected by a variety of factors, including manufacturing costs, the average selling price of our Inspire system, the implementation of cost-reduction strategies, inventory obsolescence costs, which generally occur when new generations of our Inspire system are introduced, and to a lesser extent the sales mix between the U.S., Europe, and Japan as our average selling price in the U.S. tends to be higher than in Europe and Japan. Our gross margin may increase slightly to the extent our production volumes increase and we receive discounts on the costs charged by our contract manufacturers, thereby reducing our per unit costs. On the other hand, our gross margin may decrease slightly to the extent our materials and labor prices increase due to supply chain issues and inflation, thereby increasing our per unit costs. However, our gross margin may also fluctuate from quarter to quarter due to seasonality.

Research and Development Expenses

Research and development expenses consist primarily of product development, engineering, clinical studies to develop and support our products, regulatory expenses, quality assurance, testing, consulting services and other costs associated with the next generation versions of the Inspire system. These expenses include employee compensation, including stock-based compensation, supplies, materials, consulting, and travel expenses related to research and development programs. Additionally, these expenses include clinical trial management, payments to clinical investigators, data management and travel expenses for our various clinical trials.

We expect research and development expenses to increase in the future as we develop next generation versions of our Inspire system and continue to expand our clinical studies to further expand positive coverage policies from private commercial payors in the U.S. and enter into new markets including additional European countries and the Asia Pacific region. We expect research and development expenses as a percentage of revenue to vary over time depending on the level and timing of initiating new product development efforts and new clinical development activities.

Selling, General and Administrative Expenses

Selling, general and administrative ("SG&A") expenses consist primarily of compensation for personnel, including base salaries, stock-based compensation expense and commissions related to our sales organization, finance, information technology, and human resource functions, as well as spending related to marketing, sales operations,

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and training and reimbursement personnel. Other SG&A expenses include training physicians, travel expenses, advertising, direct-to-consumer promotional programs, conferences, trade shows and consulting services, professional services fees, audit fees, insurance costs and general corporate expenses, including facilities-related expenses.

We expect SG&A expenses to continue to increase as we expand our commercial infrastructure to both drive and support our planned growth in revenue and as we increase our headcount and expand administrative personnel to support our growth and operations as a public company including finance personnel and information technology services. Additionally, we anticipate an increase in our stock-based compensation expense with grants of stock options, restricted stock units, performance stock units, and shares of our common stock purchased pursuant to our employee stock purchase plan.

Other Expense

Other expense consists primarily of interest expense payable under our credit facility, realized losses on foreign currency, and interest income.

Seasonality

Historically, we have experienced seasonality in our first and fourth quarters, and we expect this trend to continue. In the U.S., we have experienced, and may in the future experience, higher sales in the fourth quarter as a result of patients having paid their annual insurance deductibles in full, thereby reducing their out-of-pocket costs. Alternatively, in the first quarter, many U.S. patients' insurance deductibles reset, requiring more out-of-pocket costs, which negatively impacts our sales during this period. In Germany, we have experienced reduced demand for our Inspire therapy in the first quarter of each year as Neue Untersuchungs-und-Behandlungsmethoden ("NUB") coverage status is being determined and as hospitals are establishing their budgets pertaining to allocation of funds to purchase our Inspire therapy. Beginning January 1, 2021, Inspire therapy is fully integrated into the German hospital reimbursement system (“G-DRG”), and we therefore may experience less seasonal fluctuations in Germany although it may not eliminate them.

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Results of Operations

Comparison of the Three Months Ended March 31, 2022 and 2021

	Three Months Ended
	March 31,
	2022		2021		$ Change		% Change
	(in thousands, except percentages)
Revenue	$	69,382	$	40,352	$	29,030	71.9	%
Cost of goods sold	10,004		5,981		4,023		67.3	%
Gross profit	59,378		34,371		25,007		72.8	%
Gross margin	85.6%		85.2%
Operating expenses:
Research and development	11,870		8,154		3,716		45.6	%
Selling, general and administrative	63,564		41,906		21,658		51.7	%
Total operating expenses	75,434		50,060		25,374		50.7	%
Operating loss	(16,056)		(15,689)		(367)		2.3	%
Other expense, net	538		504		34		6.7	%
Loss before income taxes	(16,594)		(16,193)		(401)		2.5	%
Income taxes	100		23		77		334.8	%
Net loss	$	(16,694)	$	(16,216)	$	(478)	2.9	%

Revenue

Revenue increased $29.0 million, or 71.9%, to $69.4 million for the three months ended March 31, 2022 compared to $40.4 million for the three months ended March 31, 2021. These results reflect an increase in sales of our Inspire system of $28.6 million increase in the U.S. and an increase of $0.4 million outside of the U.S., primarily in Germany. Revenue growth was primarily due to increased market penetration in existing territories, expansion into new territories, and increased physician and patient awareness of our Inspire system.

During both of the quarters ended March 31, 2021 and March 31, 2022, resurgences of COVID-19 in various U.S. and European regions disrupted our ability to access our clinician customers and their patients, although surgical volumes generally returned to pre-pandemic levels by the end of each quarter.

Revenue information by region is summarized as follows:

	Three Months Ended March 31,
	2022				2021				Change
	Amount		% of Revenue		Amount		% of Revenue		$		%
	(in thousands, except percentages)
United States	$	66,426	95.7	%	$	37,769	93.6	%	$	28,657	75.9	%
All other countries	2,956		4.3	%	2,583		6.4	%	373		14.4	%
Total revenue	$	69,382	100.0	%	$	40,352	100.0	%	$	29,030	71.9	%

Revenue generated in the U.S. was $66.4 million for the three months ended March 31, 2022, an increase of $28.6 million, or 75.9%, compared to the three months ended March 31, 2021. Revenue growth in the U.S. was primarily due to increased market penetration in existing territories, expansion into new territories, and increased physician and patient awareness of our Inspire system. As noted above, U.S. revenue during both periods was negatively impacted by the COVID-19 pandemic.

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Revenue generated outside of the U.S. was $3.0 million in the three months ended March 31, 2022, an increase of $0.4 million, or 14.4%, compared to the three months ended March 31, 2021. Revenue growth was primarily due to increased market penetration in existing territories, the expansion of our European sales representatives into new territories, and increased physician and patient awareness of our Inspire system, and sales to our Japanese distributor. Revenue growth was somewhat offset by unfavorable exchange rates. As noted above, revenue outside of the U.S. during both periods was negatively impacted by the COVID-19 pandemic.

Cost of Goods Sold and Gross Margin

Cost of goods sold increased $4.0 million, or 67.3%, to $10.0 million for the three months ended March 31, 2022 compared to $6.0 million for the three months ended March 31, 2021. The increase was primarily due to product costs associated with higher sales volume of our Inspire system.

Gross margin increased to 85.6% for the three months ended March 31, 2022 compared to 85.2% for the three months ended March 31, 2021. Gross margin for the three months ended March 31, 2022 was higher primarily due to increased sales volume and manufacturing efficiencies.

Research and Development Expenses

Research and development expenses increased $3.7 million, or 45.6%, to $11.9 million for the three months ended March 31, 2022 compared to $8.2 million for the three months ended March 31, 2021. This change was primarily due to an increase of $1.9 million of compensation and employee-related expenses, mainly as a result of increased headcount and stock-based compensation expense and $1.8 million for ongoing research and development costs, including ongoing development of the Inspire Cloud and the next generation Inspire system.

Selling, General and Administrative Expenses

SG&A expenses increased $21.7 million, or 51.7%, to $63.6 million for the three months ended March 31, 2022 compared to $41.9 million for the three months ended March 31, 2021. The primary driver of this change was an increase of $12.5 million in compensation, including salaries, commissions, stock-based compensation, and other employee-related expenses, mainly as a result of increased headcount. In addition, marketing expenses increased $7.1 million, primarily consisting of direct-to-consumer initiatives, including new national TV advertisements, which began airing in January 2022, and the expansion of our Advisor Care Program call center. Other drivers of the change to SG&A expenses included an increase in travel expenses of $1.3 million, and an increase in general corporate costs of $0.8 million primarily due to office rent expense, insurance costs, computer equipment and software, and consulting fees.

Other Expense

Other expense was $0.5 million for both of the three months ended March 31, 2022 and March 31, 2021.

Income Taxes

We recorded a provision for incomes taxes of approximately $0.1 million for both of the three months ended March 31, 2022 and March 31, 2021.

Liquidity and Capital Resources

As of March 31, 2022, we had cash, cash equivalents and available-for-sale securities of $213.1 million, a decrease of $11.3 million from $224.4 million as of December 31, 2021. Working capital totaled $219.3 million as of March 31, 2022, a decrease of $7.9 million from December 31, 2021. We define working capital as current assets less current liabilities. The decrease in working capital was primarily due to a $11.2 million decrease in cash and cash equivalents which was used to support operations. Working capital also decreased with a $5.4 million increase in accounts payable, generally due to our business volume and headcount growth from the prior year; the movement

30

of $3.1 million of our long-term debt into current liabilities, as the first principal payments became due in April 2022; and a $0.2 million decrease in prepaid expense and other current assets. The decrease in working capital was partially offset by a decrease of $6.6 million in accrued expenses primarily due to accrued compensation paid during the first quarter of 2022, an increase of $5.0 million in inventory balances which grew to meet higher sales and to establish safety stock to avoid inventory shortages in the event of COVID-related production or supply issues, and an increase of $0.4 million in accounts receivable due to higher sales.

We proactively manage our access to capital to support liquidity and continued growth. Our sources of capital include sales of our Inspire system, borrowings under credit facilities and registered offerings of our common stock. At March 31, 2022, we had $24.5 million of outstanding borrowings under our credit facility and no borrowings remain available under this credit facility. We began paying principal payments on the borrowings in April 2022, and the scheduled maturity date of the facility is March 2024. We were in compliance with all covenants under the credit facility as of March 31, 2022.

The primary objective of our investment activities is to preserve our capital for the purpose of funding operations while at the same time maximizing the income we receive from our investments without significantly increasing risk or decreasing availability. To achieve these objectives, our investment policy allows us to maintain a portfolio of certain types of debt securities issued by the U.S. government and its agencies, corporations with investment-grade credit ratings, or commercial paper and money market funds issued by the highest quality financial and non-financial companies. At March 31, 2022, we had $189.4 million in money market funds and $9.8 million of investments in U.S. government securities, and no investments with a contractual maturity over two years.

In the three months ended March 31, 2022, our SG&A expenditures increased significantly over the prior year period levels, and we anticipate further increases in 2022. Our SG&A expenditures, primarily for increasing headcount and advertising, may exceed any associated increases in revenues, and therefore would reduce our cash flow from operations. We also anticipate R&D expenses will continue to be significant in fiscal 2022, primarily related to the ongoing development of the Inspire Cloud and the next generation Inspire system.

We spent $1.2 million on purchases of property and equipment in three months ended March 31, 2022, mainly on testing systems and production equipment. We anticipate further capital expenditures in 2022, primarily for additional equipment.

As of March 31, 2022, we did not have any off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on our financial condition, results of operations, liquidity, capital expenditures or capital resources.

We believe that our existing cash and cash equivalents and investments, which totaled $213.1 million as of March 31, 2022, together with cash flow from operations, will provide liquidity sufficient to meet our cash needs and fund our operations and planned capital expenditures for at least the next 12 months. There can be no assurance, however, that our business will continue to generate cash flows at historic levels.

Beyond the next 12 months, our cash requirements will depend extensively on the timing of market introduction, and extent of market acceptance of, our Inspire system. Our long-term cash requirements also will be significantly impacted by the level of our investment in commercialization, entry into new markets such as Singapore, Hong Kong, and Australia, and whether we make strategic acquisitions. We cannot accurately predict our long-term cash requirements at this time. Additionally, The COVID-19 pandemic has negatively impacted the global economy, disrupted global supply chains and created significant volatility and disruption of financial markets. An extended period of global supply chain and economic disruption could materially affect our business, results of operations, access to sources of liquidity and financial condition. We may seek additional sources of liquidity and capital resources through additional securities offerings or through borrowings under a new credit facility. There can be no assurance that such transactions will be available to us on favorable terms, if at all.

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Cash Flows

The following table presents a summary of our cash flow for the periods indicated:

	Three Months Ended
	March 31,
	2022		2021
	(in thousands)
Net cash provided by (used in):
Operating activities	$	(12,748)	$	(10,401)
Investing activities	(1,465)		(1,321)
Financing activities	3,044		3,550
Effect of exchange rate on cash	(7)		2
Net decrease in cash and cash equivalents	$	(11,176)	$	(8,170)

Operating Activities

The net cash used in operating activities was $12.7 million for the three months ended March 31, 2022 and consisted of a net loss of $16.7 million, non-cash charges of $10.5 million, and a decrease in net operating assets of $6.5 million. The non-cash charges consisted primarily of stock-based compensation, which increased mainly as a result of granting more stock options and restricted stock to employees at a higher fair market value, as well as the introduction of performance stock unit grants. The remainder of the non-cash charges included depreciation and amortization, non-cash lease expense, stock issued for services rendered, accretion of the debt discount, and accretion of the investment discount. Operating assets includes inventories, which increased due to manufacturing of systems inventory to meet increased sales and to establish safety stock to avoid inventory shortages in the event of COVID-related production or supply issues. Operating assets also includes accounts receivable which increased slightly over the prior year-end balance, and prepaid expenses and other current assets which decreased slightly. Operating liabilities includes accrued expenses, which decreased primarily due to the payment of accrued compensation as annual bonuses were paid, and accounts payable, which increased generally due to our increased business volume year-over-year and the costs to support the growth of our operations, including compensation and personnel-related costs.

Investing Activities

Net cash provided by investing activities for the three months ended March 31, 2022 was $1.5 million and consisted of purchases of property and equipment of $1.2 million and the purchase of an investment of $0.3 million.

Financing Activities

Net cash provided by financing activities was $3.0 million for the three months ended March 31, 2022 and consisted of proceeds from the exercise of stock options of $3.1 million, partially offset by less than $0.1 million of taxes paid to net share settlement of RSUs.

Contractual Obligations and Commitments

There have been no material changes to our contractual obligations and commitments from those described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Critical Accounting Policies and Estimates

Our critical accounting policies and estimates are described in "Management's Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates" in our Annual Report on Form 10-

32

K for the fiscal year ended December 31, 2021. We have reviewed and determined that those critical accounting policies and estimates remain our critical accounting policies and estimates as of and for the three months ended March 31, 2022.

Recent Accounting Pronouncements

We have reviewed all recently issued standards and have determined that such standards will not have a significant impact on our financial statements or do not otherwise apply to our operations.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

The risk associated with fluctuating interest rates is primarily limited to our cash equivalents which are carried at quoted market prices and our short-term investments. We do not currently use or plan to use financial derivatives in our investment portfolio. The interest rate for our outstanding debt is variable. A hypothetical 1% change in interest rates during any of the periods presented would not have had a material impact on our financial statements.

Credit Risk, Foreign Currency Risk, and Inflation Risk

For market risks related to changes in credit, foreign currency, and inflation, reference is made to Item 7A “Quantitative and Qualitative Disclosures About Market Risk” contained in Part II of our Annual Report on Form 10-K for the year ended December 31, 2021. Our exposure to these risks has not materially changed from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Item 4.    Controls and Procedures.

Evaluation of disclosure controls and procedures

The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, refers to controls and other procedures that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. Our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Our management, with the participation of our chief executive officer and our chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on that evaluation, our chief executive officer and our chief financial officer concluded that our disclosure controls and procedures were effective, at the reasonable assurance level, as of the end of the period covered by this Quarterly Report on Form 10-Q.

Changes in internal control over financial reporting.

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarter ended March 31, 2022 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1.    Legal Proceedings.

From time to time we may be involved in claims and proceedings arising in the course of our business. The outcome of any such claims or proceedings, regardless of the merits, is inherently uncertain. We are not party to any material legal proceedings.

Item 1A.    Risk Factors.

For a discussion of our potential risks and uncertainties, see the information in "Part I, Item IA. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021. There have been no material changes to the risk factors disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

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.

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Item 6.    Exhibits.

Exhibit Number	Description	Form	File No.	Exhibit	Filing Date	Filed/ Furnished Herewith
3.1	Seventh Amended and Restated Certificate of Incorporation of Inspire Medical Systems, Inc.	8-K	001-38468	3.1	5/7/2018
3.2	Amended and Restated Bylaws of Inspire Medical Systems, Inc.	8-K	001-38468	3.2	5/7/2018
31.1	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					*
31.2	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					*
32.1	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					**
32.2	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					**
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document					*
101.SCH	Inline XBRL Taxonomy Extension Schema Document					*
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document					*
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document					*
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document					*
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document					*
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)					*

_______________________________________________________________________________

*    Filed herewith.

**    Furnished herewith.

35

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.

		Inspire Medical Systems, Inc.
Date:	May 3, 2022	By:	/s/ TIMOTHY P. HERBERT
			Timothy P. Herbert
			President, Chief Executive Officer and Director
			(principal executive officer)
Date:	May 3, 2022	By:	/s/ RICHARD J. BUCHHOLZ
			Richard J. Buchholz
			Chief Financial Officer
			(principal financial officer and principal accounting officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Timothy P. Herbert, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Inspire Medical Systems, Inc.;

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

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

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

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

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

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

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

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

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

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

Date:	May 3, 2022	By:	/s/ TIMOTHY P. HERBERT
			Timothy P. Herbert President, Chief Executive Officer and Director (principal executive officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Richard J. Buchholz, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Inspire Medical Systems, Inc.;

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

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

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

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

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

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

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

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

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

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

Date:	May 3, 2022	By:	/s/ RICHARD J. BUCHHOLZ
			Richard J. Buchholz Chief Financial Officer (principal financial officer and principal accounting 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 Quarterly Report of Inspire Medical Systems, Inc. (the "Company") on Form 10-Q for the quarterly period ended March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date:	May 3, 2022	By:	/s/ TIMOTHY P. HERBERT
			Timothy P. Herbert President, Chief Executive Officer and Director (principal executive officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. § 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

EX-32.2

Exhibit 32.2

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 Quarterly Report of Inspire Medical Systems, Inc. (the "Company") on Form 10-Q for the quarterly period ended March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date:	May 3, 2022	By:	/s/ RICHARD J. BUCHHOLZ
			Richard J. Buchholz Chief Financial Officer (principal financial officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. § 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

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Cover Page - shares	3 Months Ended
	Mar. 31, 2022	Apr. 26, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-38468
Entity Registrant Name	Inspire Medical Systems, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-1377674
Entity Address, Address Line One	5500 Wayzata Blvd.
Entity Address, Address Line Two	Suite 1600
Entity Address, City or Town	Golden Valley
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55416
City Area Code	844
Local Phone Number	672-4357
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	INSP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		27,591,115
Entity Central Index Key	0001609550
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1

XML

BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 203,291	$ 214,467
Accounts receivable, net of allowance for credit losses of $99 and $99, respectively	34,544	34,179
Inventories	22,198	17,231
Prepaid expenses and other current assets	2,444	2,660
Total current assets	262,477	268,537
Investments, long-term	9,796	9,938
Property and equipment, net	9,334	8,486
Operating lease right-of-use asset	7,659	7,919
Other non-current assets	454	204
Total assets	289,720	295,084
Current liabilities:
Accounts payable	17,022	11,665
Accrued expenses	13,896	20,454
Notes payable, current portion	12,250	9,188
Total current liabilities	43,168	41,307
Notes payable, non-current portion	12,798	15,799
Operating lease liability, non-current portion	8,553	8,796
Other non-current liabilities	146	134
Total liabilities	64,665	66,036
Stockholders' equity:
Preferred Stock, $0.001 par value, 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common Stock, $0.001 par value per share; 200,000,000 shares authorized; 27,568,004 and 27,416,106 issued and outstanding at March 31, 2022 and December 31, 2021, respectively	28	27
Additional paid-in capital	521,308	508,465
Accumulated other comprehensive loss	(198)	(55)
Accumulated deficit	(296,083)	(279,389)
Total stockholders' equity	225,055	229,048
Total liabilities and stockholders' equity	$ 289,720	$ 295,084

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BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 99	$ 99
Preferred shares, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred shares, authorized (in shares)	10,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	200,000,000	200,000,000
Common stock, issued (in shares)	27,568,004	27,416,106
Common stock, outstanding (in shares)	27,568,004	27,416,106

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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 69,382	$ 40,352
Cost of goods sold	10,004	5,981
Gross profit	59,378	34,371
Operating expenses:
Research and development	11,870	8,154
Selling, general and administrative	63,564	41,906
Total operating expenses	75,434	50,060
Operating loss	(16,056)	(15,689)
Other expense (income):
Interest income	(34)	(57)
Interest expense	527	523
Other expense, net	45	38
Total other expense	538	504
Loss before income taxes	(16,594)	(16,193)
Income taxes	100	23
Net loss	(16,694)	(16,216)
Other comprehensive loss:
Unrealized loss on investments	(143)	(20)
Total comprehensive loss	$ (16,837)	$ (16,236)
Net loss per share, basic (in dollars per share)	$ (0.61)	$ (0.60)
Net loss per share, diluted (in dollars per share)	$ (0.61)	$ (0.60)
Weighted average common shares used to compute net loss per share, basic (in shares)	27,517,268	27,144,361
Weighted average common shares used to compute net loss per share, diluted (in shares)	27,517,268	27,144,361

XML

STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		27,069,276
Beginning balance at Dec. 31, 2020	$ 229,747	$ 27	$ 467,038	$ 29	$ (237,347)
Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)		133,421
Stock options exercised	3,550		3,550
Issuance and sale of common stock (in shares)		376
Issuance and sale of common stock	73		73
Stock-based compensation expense	5,997		5,997
Other comprehensive loss	(20)			(20)
Net loss	(16,216)				(16,216)
Ending balance (in shares) at Mar. 31, 2021		27,203,073
Ending balance at Mar. 31, 2021	$ 223,131	$ 27	476,658	9	(253,563)
Beginning balance (in shares) at Dec. 31, 2021	27,416,106	27,416,106
Beginning balance at Dec. 31, 2021	$ 229,048	$ 27	508,465	(55)	(279,389)
Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	151,186	151,186
Stock options exercised	$ 3,087	$ 1	3,086
Vesting of restricted stock units (in shares)	569
Withholding taxes on net share settlement of restricted stock units (in shares)	(205)
Withholding taxes on net share settlement of restricted stock units	$ (43)		(43)
Issuance and sale of common stock (in shares)		348
Issuance and sale of common stock	79		79
Stock-based compensation expense	9,721		9,721
Other comprehensive loss	(143)			(143)
Net loss	$ (16,694)				(16,694)
Ending balance (in shares) at Mar. 31, 2022	27,568,004	27,568,004
Ending balance at Mar. 31, 2022	$ 225,055	$ 28	$ 521,308	$ (198)	$ (296,083)

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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (16,694)	$ (16,216)
Adjustments to reconcile net loss:
Depreciation and amortization	359	234
(Accretion) amortization of investment (discount) premium	(1)	30
Accretion of debt discount	62	58
Non-cash lease expense	260	171
Stock-based compensation expense	9,721	5,997
Non-cash stock issuance for services rendered	79	73
Other, net	0	(8)
Changes in operating assets and liabilities:
Accounts receivable	(382)	3,381
Inventories	(4,967)	(2,905)
Prepaid expenses and other current assets	216	356
Accounts payable	5,520	1,477
Accrued expenses and other liabilities	(6,921)	(3,049)
Net cash used in operating activities	(12,748)	(10,401)
Investing activities
Purchases of property and equipment	(1,215)	(1,321)
Purchases of other investments	(250)	0
Net cash used in investing activities	(1,465)	(1,321)
Financing activities
Proceeds from the exercise of stock options	3,087	3,550
Taxes paid on net share settlement of restricted stock units	(43)	0
Net cash provided by financing activities	3,044	3,550
Effect of exchange rate on cash	(7)	2
Decrease in cash and cash equivalents	(11,176)	(8,170)
Cash and cash equivalents at beginning of period	214,467	190,518
Cash and cash equivalents at end of period	203,291	182,348
Supplemental cash flow information
Cash paid for interest	466	466
Change in property and equipment acquired but not yet paid	$ 284	$ 1,209

XML

Organization	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	OrganizationDescription of BusinessInspire Medical Systems, Inc. is a medical technology company focused on the development and commercialization of innovative, minimally invasive solutions for patients with obstructive sleep apnea ("OSA"). Our proprietary Inspire system is the first and only United States ("U.S.") Food and Drug Administration ("FDA") approved neurostimulation technology that provides a safe and effective treatment for moderate to severe OSA. Inspire therapy received premarket approval ("PMA") from the FDA in 2014 and has been commercially available in certain European markets since 2011. Japan's Ministry of Health, Labour and Welfare ("MLHW") approved Inspire therapy to treat moderate to severe OSA in 2018 and was formally added to the Japan National Health Insurance Payment Listing in 2021. In 2020, the Australian Therapeutic Goods Administration approved Inspire therapy to treat moderate to severe OSA, and we are currently seeking reimbursement coverage in Australia.

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial reporting and as required by the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including those which are normal and recurring) considered necessary for a fair presentation of the interim financial information have been included. When preparing financial statements in conformity with GAAP, we must make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures at the date of the financial statements. Actual results could differ from those estimates. Additionally, the results of operations for the interim periods are not necessarily indicative of the operating results for the full fiscal year or any future periods. For a complete discussion of our significant accounting policies and other information, the unaudited financial statements and notes thereto should be read in conjunction with the audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Cash and Cash Equivalents

We consider all highly liquid securities, readily convertible to cash, that have original maturities of 90 days or less from the date of purchase to be cash equivalents. The carrying amount reported in the balance sheets for cash is cost, which approximates fair value.

Foreign Currency

Sales and expenses denominated in foreign currencies are translated at average exchange rates in effect throughout the year. Foreign currency transaction gains and losses are included in other expense, net, in the statements of operations and comprehensive loss. Assets and liabilities of foreign operations are remeasured at period-end exchange rates with the impacts of foreign currency remeasurement recognized in other expense, net in the statements of operations and comprehensive loss.

Investments

At both March 31, 2022 and December 31, 2021, our long-term investments consisted of U.S. government securities. Investments are reported at their estimated fair market values which are based on quoted, active or inactive market prices when available. Any unrealized gains and losses due to interest rate fluctuations and other external factors are reported as a separate component of accumulated other comprehensive loss. We had $0.2 million and $0.1 million of unrecognized loss in accumulated other comprehensive loss at March 31, 2022 and

December 31, 2021, respectively. Any realized gains and losses are calculated on the specific identification method and reported net in other expense, net in the statements of operations and comprehensive loss. For both of the three months ended March 31, 2022 and 2021, we recognized $0 of realized gains, net.

We reassess our estimated credit losses on investments each reporting period. U.S. government securities and cash equivalents are under a "zero-loss exception" for credit losses, meaning no credit loss risk calculation is necessary on those instruments due to the exceptionally low rate of default, which continues to decrease as the securities approach maturity, which for us is no longer than two years. We record changes in the allowance for credit losses for available-for-sale debt securities with a corresponding adjustment in credit loss expense on the statement of operations and comprehensive loss. No reversal of a previously recorded allowance for credit losses may be made to an amount below zero. The total allowance for credit losses was $0 at both March 31, 2022 and December 31, 2021.

Fair Value of Financial Instruments

We measure certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents and investments. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. A three-tier fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value:

Level 1: Observable inputs, such as quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2: Inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activities, which would require us to develop our own assumptions.

We use the methods and assumptions described below in determining the fair value of our financial instruments.

Money market funds: Fair values of money market funds are based on quoted market prices in active markets. These are included as Level 1 measurements in the tables below.

U.S. government securities: Consists of U.S. government Treasury bills with original maturities of less than two years. These are included as a Level 1 measurement in the tables below.

The following tables set forth by level within the fair value hierarchy our assets that are measured on a recurring basis and reported at fair value as of March 31, 2022 and December 31, 2021. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Fair Value Measurements as of
	March 31, 2022
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,379	$	189,379	$	—	$	—
Total cash equivalents	189,379		189,379		—		—
Investments:
U.S. government securities	9,796		9,796		—		—
Total investments	9,796		9,796		—		—
Total cash equivalents and investments	$	199,175	$	199,175	$	—	$	—

	Fair Value Measurements as of
	December 31, 2021
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,369	$	189,369	$	—	$	—
Total cash equivalents	189,369		189,369		—		—
Investments:
U.S. government securities	9,938		9,938		—		—
Total investments	9,938		9,938		—		—
Total cash equivalents and investments	$	199,307	$	199,307	$	—	$	—

There were no transfers between levels during the periods ended March 31, 2022 and December 31, 2021.

Concentration of Credit Risk

Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash equivalents, investments, and accounts receivable.

Our investment policy limits investments to certain types of debt securities issued by the U.S. government and its agencies, corporations with investment-grade credit ratings, or commercial paper and money market funds issued by the highest quality financial and non-financial companies. We place restrictions on maturities and concentration by type and issuer. We are exposed to credit risk in the event of a default by the issuers of these securities to the extent recorded on the balance sheets. However, as of March 31, 2022 and December 31, 2021, we limited our credit risk associated with cash equivalents by placing investments with banks we believe are highly creditworthy.

We believe that the credit risk in our accounts receivable is mitigated by our credit evaluation process, relatively short collection terms, and dispersion of our customer base. We generally do not require collateral, and losses on accounts receivable have historically not been significant.

Accounts Receivable and Allowance for Expected Credit Losses

Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Customer credit terms are established prior to shipment with the general standard being net 30 days. Collateral or any other security to support payment of these receivables generally is not required.

Each reporting period, we estimate the credit loss related to accounts receivable based on a migration analysis of accounts grouped by individual receivables delinquency status, and apply our historic loss rate adjusted for management's assumption of future market conditions. Any change in the allowance from new receivables acquired, or changes due to credit deterioration on previously existing receivables, is recorded in selling, general and administrative expenses. Write-offs of receivables considered uncollectible are deducted from the allowance. Specific accounts receivable are written-off once a determination is made that the amount is uncollectible. The write-off is recorded in the period in which the account receivable is deemed uncollectible. Recoveries are recognized when received and as a direct credit to earnings or as a reduction to the allowance for credit losses (which would indirectly reduce the loss by decreasing bad debt expense).

Inventories

Inventories are valued at the lower of cost or net realizable value, computed on a first-in, first-out basis and consisted of the following:

	March 31, 2022		December 31, 2021
Raw materials	$	5,342	$	3,119
Finished goods	16,856		14,112
Total inventories, net of reserves	$	22,198	$	17,231

We regularly review inventory quantities on-hand for excess and obsolete inventory and, when circumstances indicate, incur charges to write down inventories to their net realizable value. The determination of a reserve for excess and obsolete inventory involves management exercising judgment to determine the required reserve, considering future demand, product life cycles, introduction of new products and current market conditions. The reserve for excess and obsolete inventory was $0.4 million and $0.3 million as of March 31, 2022 and December 31, 2021, respectively.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization and consisted of the following:

	March 31, 2022		December 31, 2021
Computer equipment and software	$	1,500	$	1,397
Manufacturing equipment	5,238		4,436
Other equipment	311		249
Leasehold improvements	281		281
Construction in process	5,415		5,175
Property and equipment, cost	12,745		11,538
Less: accumulated depreciation and amortization	(3,411)		(3,052)
Property and equipment, net	$	9,334	$	8,486

Depreciation is determined using the straight-line method over the estimated useful lives of the respective assets, generally three to five years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the term of the lease. Depreciation and amortization expense was $0.4 million and $0.2 million for the three months ended March 31, 2022 and 2021, respectively.

Impairment of Long-lived Assets

Long-lived assets consist primarily of property and equipment and operating lease right-of-use asset and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an

asset may not be recoverable. If circumstances require that an asset be tested for possible impairment, we compare the undiscounted cash flows expected to be generated by the asset to the carrying amount of the asset. If the carrying amount of the asset is not recoverable on an undiscounted cash flow basis, we determine the fair value of the asset and recognize an impairment loss to the extent the carrying amount of the asset exceeds its fair value. We determine fair value using the income approach based on the present value of expected future cash flows or other appropriate measures of estimated fair value. Our cash flow assumptions consider historical and forecasted revenue and operating costs and other relevant factors. We did not record any impairment charges on long-lived assets during either of the three months ended March 31, 2022 or 2021.

Accrued Expenses

Accrued expenses consisted of the following:

	March 31, 2022		December 31, 2021
Payroll related	$	10,565	$	17,655
Interest	160		160
Product warranty liability	438		468
Operating lease liability, current portion	673		312
Other accrued expenses	2,060		1,859
Total accrued expenses	$	13,896	$	20,454

The following table shows the changes in our estimated product warranty liability accrual, included in accrued liabilities:

	Three Months Ended March 31,
	2022		2021
Balance at beginning of period	$	468	$	159
Accruals of warranties issued	11		178
Settlements of warranty claims	(41)		(71)
Balance at the end of the period	$	438	$	266

Revenue Recognition

We recognize revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606"). Revenues from product sales are recognized when the customer obtains control of the product, which occurs at a point in time, either upon shipment of the product or receipt of the product, depending on shipment terms. Our standard shipping terms are free on board shipping point, unless the customer requests that control and title to the inventory transfer upon delivery. In those cases where shipping and handling costs are billed to customers, we classify the amounts billed as a component of cost of goods sold.

Revenue is measured as the amount of consideration we expect to receive, adjusted for any applicable estimates of variable consideration and other factors affecting the transaction price, which is based on the invoiced price, in exchange for transferring products. All revenue is recognized when we satisfy our performance obligations under the contract. The majority of our contracts have a single performance obligation and are short term in nature.

Sales taxes and value added taxes in foreign jurisdictions that are collected from customers and remitted to governmental authorities are accounted for on a net basis and therefore are excluded from net sales. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of goods sold.

Variable consideration related to certain customer sales incentives is estimated based on the amounts expected to be paid based on the agreement with the customer using probability assessments.

We offer customers a limited right of return for our product in case of non-conformity or performance issues. We estimate the amount of our product sales that may be returned by our customers based on historical sales and returns. As our historical product returns to date have been immaterial, we have not recorded a reduction in revenue related to variable consideration for product returns.

See Note 9 for disaggregated revenue by geographic area.

Cost of Goods Sold

Cost of goods sold consists primarily of acquisition costs for the components of the Inspire system, overhead costs, scrap and inventory obsolescence, warranty replacement costs, as well as distribution-related expenses such as logistics and shipping costs, net of shipping costs charged to customers. The overhead costs include the cost of material procurement, depreciation expense for production equipment, and operations supervision and management personnel, including employee compensation, stock-based compensation, supplies, and travel.

Research and Development

Research and development expenses consist primarily of product development, clinical and regulatory affairs, quality assurance, consulting services, and other costs associated with products and technologies in development. These expenses include employee compensation, including stock-based compensation, supplies, materials, consulting, and travel expenses related to research and development programs. Clinical expenses include clinical trial design, clinical site reimbursement, data management, travel expenses, and the cost of manufacturing products for clinical trials.

Stock-Based Compensation

We maintain an equity incentive plan to provide long-term incentives for eligible employees, consultants, and members of the board of directors. The plan allows for the issuance of restricted stock units ("RSUs"), performance stock units ("PSUs"), and non-statutory and incentive stock options to employees, and RSUs, PSU's, and non-statutory stock options to consultants and directors. We also offer an employee stock purchase plan ("ESPP") which allows participating employees to purchase shares of our common stock at a discount through payroll deductions. We have not granted any stock-based awards to our consultants.

We recognize equity-based compensation expense for awards of equity instruments based on the grant date fair value of those awards in accordance with ASC Topic 718, Stock Compensation ("ASC 718"). ASC 718 requires all equity-based compensation awards, including grants of RSUs, PSUs, and stock options, to be recognized as expense in the statements of operations and comprehensive loss based on their grant date fair values. We estimate the fair value of stock options using the Black-Scholes option pricing model and the fair value of RSUs and PSUs is equal to the closing price of our common stock on the grant date. The fair value of each purchase under the employee stock purchase plan is estimated at the beginning of the offering period using the Black-Scholes option pricing model.

Stock-based compensation expense is recognized on a straight-line basis over the vesting term for stock options and RSUs, and over the vesting and performance period based on the probability of achieving the performance objectives for PSUs. We account for award forfeitures as they occur.

Advertising Expenses

We expense the costs of advertising, including promotional expenses, as incurred. Advertising expenses were $15.5 million and $9.0 million during the three months ended March 31, 2022 and 2021, respectively.

Leases

Operating leases are included in operating lease right-of-use ("ROU") asset, accrued expenses, and operating lease liability – non-current portion in our balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, we use our incremental borrowing rate based on the information available at the lease commencement date as the rate implicit in the lease is not readily determinable. The determination of our incremental borrowing rate requires management judgment based on information available at lease commencement. The operating lease ROU assets also include adjustments for prepayments, accrued lease payments, and exclude lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. Operating lease cost is recognized on a straight-line basis over the expected lease term. Lease agreements entered into after the adoption of ASC 842 that include lease and non-lease components are accounted for as a single lease component. Lease agreements with a noncancelable term of less than 12 months are not recorded on our balance sheets.

Income Taxes

We account for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect when the differences are expected to reverse. Valuation allowances against deferred tax assets are established, when necessary, to reduce deferred tax assets to the amounts expected to be realized. As we have historically incurred operating losses, we have recorded a full valuation allowance against our net deferred tax assets, and there is no provision for income taxes other than minimal state taxes and an accrual for uncertain tax benefits. Our policy is to record interest and penalties expense related to uncertain tax positions as other expense in the statements of operations and comprehensive loss.

Comprehensive Loss

Comprehensive loss consists of net loss and changes in unrealized gains and losses due to interest rate fluctuations and other external factors on investments classified as available-for-sale. Accumulated other comprehensive loss is presented in the accompanying balance sheets as a component of stockholders' equity.

Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Because we have reported a net loss for all periods presented, diluted net loss per share is the same as basic net loss per share as all potentially dilutive shares consisting of outstanding stock options, unvested RSUs and PSUs, and shares issuable under our employee stock purchase plan were antidilutive in those periods.

Recent Accounting Pronouncements

We have reviewed and considered all recent accounting pronouncements that have not yet been adopted and believe there are none that could potentially have a material impact on our business practices, financial condition, results of operations, or disclosures.

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Investments

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

Our investments are classified as available-for-sale and consist of the following:

	March 31, 2022
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,994	$	—	$	(198)	$	9,796
Long-term investments	$	9,994	$	—	$	(198)	$	9,796

	December 31, 2021
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,993	$	—	$	(55)	$	9,938
Long-term investments	$	9,993	$	—	$	(55)	$	9,938

As of March 31, 2022 and December 31, 2021, we had no investments with a contractual maturity of greater than two years. Currently, we do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. We do not consider those investments to be other-than-temporarily impaired as of March 31, 2022. At the end of each reporting period, we evaluate potential credit impairment on available-for-sale securities in an unrealized loss position, based on the expected cash flows to be collected and the yield-to-maturity on those securities. Securities with a valuation allowance for expected credit losses and deemed uncollectible are permanently written-down, and a reversal out of the valuation allowance occurs.

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Leases

3 Months Ended

Mar. 31, 2022

Leases [Abstract]

Leases

Leases

We lease approximately 70,000 square feet of office space for our corporate headquarters under non-cancelable operating leases. The leases expire May 31, 2028 with options to renew for one additional period of five years at the then-prevailing market rate. The exercise of the lease renewal options are at our sole discretion and were not included in the lease term for the calculation of the ROU asset and lease liability when the leases commenced as they were not reasonably certain of exercise.

In addition to base rent, we also pay our proportionate share of the operating expenses, as defined in the leases. These payments are made monthly and adjusted annually to reflect actual charges incurred for operating expenses, such as common area maintenance, taxes, and insurance. In conjunction with the leases, the landlord agreed to provide total rent abatement of $2.3 million.

The following table presents the lease balances within the balance sheets:

	March 31, 2022		December 31, 2021
Right-of-use assets:
Operating lease right-of-use asset	$	7,659	$	7,919
Operating lease liabilities:
Accrued expenses	673		312
Operating lease liability, non-current portion	8,553		8,796
Total operating lease liabilities	$	9,226	$	9,108

As of March 31, 2022, the remaining lease term was 6.2 years and the weighted average discount rate was 5.3%. The operating cash outflows from our operating leases were less than $0.1 million for both of the three-month periods ended March 31, 2022 and 2021.

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Long-Term Debt

3 Months Ended

Mar. 31, 2022

Long-term Debt, by Current and Noncurrent [Abstract]

Long-Term Debt

. Long-Term Debt

In March 2019 we amended our $24.5 million term loan and security agreement, which we refer to as our credit facility. The debt was interest only until April 1, 2022 and matures on March 1, 2024. The basic interest rate is the 30-day U.S. LIBOR rate, subject to a floor of 7.60%. The agreement provides a mechanism for determining an alternative interest rate to replace the U.S. LIBOR rate upon the occurrence of certain circumstances. In addition to the principal and interest payments, we are required to pay a final payment fee of 3.50% on all amounts outstanding, which is being accreted using the effective interest rate method over the term of the credit facility and shall be due at the earlier of maturity or prepayment. Borrowings are prepayable at our option in whole, subject to a prepayment fee of 1.00%. As of March 31, 2022, we had $24.5 million outstanding under our credit facility.

The credit facility includes affirmative and restrictive covenants and events of default, including the following events of default: payment defaults, breaches of covenants, judgment defaults, cross defaults to certain other contracts, certain events with respect to governmental approvals if such events could cause a material adverse change, a material impairment in the perfection or priority of the lender's security interest or in the value of the collateral, a material adverse change in the business, operations, or condition of us or any of our subsidiaries, and a material impairment of the prospect of repayment of the loans. Upon the occurrence of an event of default, a default increase in the interest rate of an additional 5.00% could be applied to the outstanding loan balance and the lender could declare all outstanding obligations immediately due and payable and take such other actions as set forth in the loan and security agreement.

Our obligations under the credit facility are secured by a first priority security interest in substantially all of our assets, other than our intellectual property. There are no financial covenants contained in the loan and security agreement. We were in compliance with the affirmative and restrictive covenants as of March 31, 2022.

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Employee Retirement Plan	3 Months Ended
	Mar. 31, 2022
Retirement Benefits [Abstract]
Employee Retirement Plan	Employee Retirement PlanWe sponsor a defined contribution employee retirement plan covering all of our full-time employees. The plan allows for eligible employees to defer a portion of their eligible compensation up to the maximum allowed by IRS Regulations. Beginning January 1, 2022, we elected to begin making voluntary matching contributions to the plan. We match 50% of the first 6% of each participating employee's contribution, up to 3% of eligible earnings. Our match contributions are made to funds designated by the participant, none of which are based on Inspire common stock. Discretionary contributions to the plan totaled $0.7 million for the three months ended March 31, 2022.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock-Based Compensation

We adopted the 2007 Stock Incentive Plan (the "2007 Plan") in November 2007, which terminated in accordance with its terms in November 2017; however, the outstanding stock options may continue to be exercised in accordance with their terms. Immediately following the termination of the 2007 Plan, we adopted the 2017 Stock Incentive Plan (the "2017 Plan"), which contains substantially similar terms and conditions as the 2007 Plan. Upon the IPO, no further grants were made under the 2017 Plan and we adopted the 2018 Stock Incentive Plan (the "2018 Plan").

The purpose of the 2018 Plan is to promote the interest of our company and our stockholders by aiding in attracting and retaining employees, officers, consultants, independent contractors, and directors capable of assuring the future success of our business and to afford such persons an opportunity to acquire a proprietary interest in our company. The board of directors may amend, alter, suspend, discontinue, or terminate the 2018 Plan at any time with the approval of our stockholders. A total of 1,386,809 shares of common stock were initially reserved for issuance under the 2018 Plan, and this share reserve will automatically be supplemented each January 1, commencing on January 1, 2019 and ending on and including January 1, 2028, by an amount of shares equal to the lesser of: a) 739,631 shares, b) 4% of the shares outstanding on the final day of the immediately preceding fiscal year and c) such smaller number of shares as determined by the board of directors. As of March 31, 2022, there were 3,953,906 shares reserved for issuance under the 2018 Plan, of which 1,605,667 shares were available for issuance.

The following table presents the components and classification of stock-based compensation expense:

	Three Months Ended
	March 31,
	2022		2021
Stock options	$	7,761	$	5,657
Restricted stock units	565		19
Performance stock units	1,010		—
Employee stock purchase plan	385		321
Total stock-based compensation expense	$	9,721	$	5,997
Cost of goods sold	$	124	$	79
Research and development	1,767		1,040
Selling, general and administrative	7,830		4,878
Total stock-based compensation expense	$	9,721	$	5,997

Stock-based compensation expense is recognized on a straight-line basis over the vesting term for stock options and RSUs, and over the performance period based on the probability of achieving the performance objectives for PSUs, and is reduced by actual forfeitures as they occur. If there are any modifications or cancellations of the underlying unvested securities, we may be required to accelerate, increase, or cancel any remaining unearned stock compensation expense. Future stock-based compensation expense and unearned stock-based compensation will increase to the extent that we grant additional stock-based awards.

Stock Options

Options are granted at the exercise price, which is equal to the closing price of our stock on the date of grant. The stock options granted to employees include a four-year service period and 25% vest after the first year of service and the remainder vest in equal installments over the next 36 months of service. The stock options granted to the board of directors vest in one or three equal annual installments, in each case, subject to the director's continuous service through the applicable vesting date. The stock options have a contractual life of ten years.

A summary of stock option activity and related information is as follows:

	Options	Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021	2,646,235		$	80.41	7.1	$397,015
Granted	281,554		$	228.40
Exercised	(151,186)		$	20.74		$29,820
Forfeited/expired	(13,388)		$	160.44
Outstanding at March 31, 2022	2,763,215		$	98.37	7.3	$437,730
Exercisable at March 31, 2022	1,510,689		$	49.56	6.3	$312,906

The aggregate intrinsic value of options exercised is the difference between the estimated fair market value of our common stock at the date of exercise and the exercise price for those options. The aggregate intrinsic value of outstanding options is the difference between the closing price as of the date outstanding and the exercise price of the underlying stock options.

As of March 31, 2022, the amount of unearned stock-based compensation to be expensed from now through the year 2026 related to unvested employee and non-employee director stock options is $94.2 million, which we expect to recognize over a weighted average period of 2.5 years.

We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model using the fair market value of our common stock on the date of grant and a number of other assumptions. These assumptions include estimates regarding the expected term of the awards, estimates of the stock volatility over a duration that approximates the expected term of the awards, estimates of the risk-free rate, and estimates of expected dividend rates.

The fair value of options granted to employees and non-employee directors was estimated as of the grant date using the Black-Scholes option pricing model using the following assumptions:

	Three Months Ended
	March 31,
	2022	2021
Expected term (years)	6.25	6.25
Expected volatility	56.6 - 56.9%	55.2 - 55.7%
Risk-free interest rate	1.75 - 2.40%	0.79 - 1.4%
Expected dividend yield	0.0%	0.0%
Weighted average fair value	$125.75	$109.27

Expected Term — Due to our limited amount of historical exercise, forfeiture, and expiration activity, we have opted to use the "simplified method" for estimating the expected term of options, whereby the expected term equals the arithmetic average of the vesting terms and the original contractual term of the option. We will continue to analyze our expected term assumption as more historical data becomes available.

Expected Volatility — Due to our limited operating history and a lack of company specific historical and implied volatility data, we have incorporated our historical stock trading volatility with those of a group of similar companies that are publicly traded for the calculation of volatility. When selecting this peer group of public companies on which we have based our expected stock price volatility, we generally selected companies with comparable characteristics to it, including enterprise value, stages of clinical development, risk profiles, position within the industry, and with historical share price information sufficient to meet the expected life of the stock-based awards. We will continue to

analyze the historical stock price volatility assumption as more historical data for our common stock becomes available.

Risk-Free Interest Rate — The risk-free rate assumption is based on the U.S. government Treasury instruments with maturities similar to the expected term of our stock options.

Expected Dividend Yield — The expected dividend assumption is based on our history of not paying dividends and our expectation that we will not declare dividends for the foreseeable future.

Restricted Stock Units

RSUs are share awards that entitle the holder to receive freely tradable shares of our common stock upon vesting. The RSUs cannot be transferred and the awards are subject to forfeiture if the holder’s employment terminates prior to the release of the vesting restrictions. The RSUs generally include a three-year service period and vest in equal installments on each anniversary of the date of grant, provided the employee remains continuously employed with the Company.

A summary of RSUs and related information is as follows:

	Restricted Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	2,275		$	201.51	$	524
Granted	59,496		$	230.60
Vested	(569)		$	201.51
Forfeited	(417)		$	227.53
Unvested at March 31, 2022	60,785		$	229.80	$	15,603

The fair value of the RSUs is equal to the closing price of our common stock on the grant date. The aggregate intrinsic value of RSUs outstanding was based on our closing stock price on the last trading day of the period. As of March 31, 2022, there was $13.4 million of unrecognized stock-based compensation expense related to RSUs that is expected to be recognized over a weighted average period of 2.9 years.

Performance Stock Units

During the quarter ended March 31, 2022, the Company granted PSUs to officers and key employees. The number of PSUs that will ultimately be earned is based on our performance relative to a pre-established goal for the three-year period ending December 31, 2024. The expense is recorded on a straight-line basis over the requisite service period based on an estimate of the number of PSUs expected to vest. Management expectations related to the achievement of the performance goal associated with PSU grants is assessed each reporting period. The number of shares earned at the end of the three-year period will vary based on actual performance, from 0% to 200% of the number of PSUs granted. If the performance condition is not met or not expected to be met, any compensation expense recognized associated with the grant will be reversed.

A summary of PSUs and related information is as follows:

	Performance Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	—		$	—	$	—
Granted	78,351		$	227.53
Unvested at March 31, 2022	78,351		$	227.53	$	20,112

There were no PSUs granted prior to 2022. The fair value of the PSUs is equal to the closing price of our common stock on the grant date. As of March 31, 2022, there was $23.1 million of unrecognized stock-based compensation expense related to outstanding PSUs that is expected to be recognized over a period of approximately 3.0 years.

Employee Stock Purchase Plan

Our employee stock purchase plan ("ESPP") allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all of our U.S.-based full-time employees. Participating employees may purchase common stock, on a voluntary after-tax basis, at a price equal to 85% of the lower of the closing market price per share of our common stock on the first or last trading day of each stock purchase period. The plan provides for six-month purchase periods, beginning on January 1 and July 1 of each calendar year.

A total of 277,362 shares of common stock were initially reserved for issuance under the ESPP, and this share reserve will automatically be supplemented each January 1, commencing on January 1, 2019 and ending on and including January 1, 2028, by an amount of shares equal to the lesser of: a) 184,908 shares, b) 1% of the shares outstanding on the final day of the immediately preceding calendar year and c) such smaller number of shares as the board of directors may determine. As of March 31, 2022, 929,504 shares were available for future issuance under the ESPP. The current purchase period under the ESPP began on January 1, 2022 and ends June 30, 2022.

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Income Taxes

3 Months Ended

Mar. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

At both March 31, 2022 and December 31, 2021, a valuation allowance was recorded against all deferred tax assets due to our cumulative net loss position. We recorded income tax expense of $0.1 million and $0.0 million in the three months ended March 31, 2022 and 2021, respectively. The nominal income tax expense in those periods reflects minimal state income tax expense and an accrual for uncertain tax benefits.

As of December 31, 2021, our gross federal net operating loss carryforward was $286.3 million, which will expire at various dates beginning in 2028. In addition, net operating loss carryforwards for state income tax purposes of $198.2 million that include net operating losses will begin to expire in 2023. We also have gross research and development credit carryforwards of $6.7 million as of December 31, 2021, which will expire at various dates beginning in 2033.

Utilization of the net operating loss carryforwards may be subject to an annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986 and similar state provisions. We have not performed a detailed analysis to determine whether an ownership change has occurred. Such a change of ownership would limit our utilization of the net operating losses and could be triggered by subsequent sales of securities by us or our stockholders.

Realization of the deferred tax assets is dependent upon the generation of future taxable income, if any, the amount and timing of which are uncertain. Based on available objective evidence and cumulative losses, we believe it is more likely than not that the deferred tax assets are not recognizable and will not be recognizable until we have sufficient taxable income. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance.

We had $0.1 million of gross unrecognized tax benefits as of each of March 31, 2022 and December 31, 2021.

We file income tax returns in the applicable jurisdictions. The 2018 to 2020 tax years remain open to examination by the major taxing authorities to which we are subject. We do not expect a significant change to our unrecognized tax benefits over the next 12 months.

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Segment Reporting and Revenue Disaggregation

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Segment Reporting and Revenue Disaggregation

Segment Reporting and Revenue Disaggregation

We operate our business as one reporting segment. An operating segment is defined as a component of an enterprise for which separate discrete financial information is available and evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance.

We sell our Inspire system to hospitals and ambulatory surgery centers in the U.S. and in select countries in Europe through a direct sales organization, and in Japan through a distributor. Revenue by geographic region is as follows:

	Three Months Ended
	March 31,
	2022		2021
United States	$	66,426	$	37,769
All other countries	2,956		2,583
Total revenue	$	69,382	$	40,352

All of our long-lived assets are located in the U.S.

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Loss Per Share

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Loss Per Share

Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Because we have reported a net loss for all periods presented, diluted net loss per share is the same as basic net loss per share as all of the following potentially dilutive shares were antidilutive in those periods.

The following common stock-based awards were excluded from the computation of diluted net loss per common share for the periods presented because including them would have been anti-dilutive:

	March 31,
	2022	2021
Common stock options outstanding	2,763,215	2,750,375
Unvested restricted stock units	60,785	2,275
Unvested performance stock units	78,351	—
Shares issuable under the ESPP	5,435	5,785
Total	2,907,786	2,758,435

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Subsequent Event	3 Months Ended
	Mar. 31, 2022
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 27, 2022, Inspire invested $10.0 million in a minority interest of the private company EnsoData, Inc. This investment is intended to support the advancement of our digital health platform.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial reporting and as required by the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including those which are normal and recurring) considered necessary for a fair presentation of the interim financial information have been included. When preparing financial statements in conformity with GAAP, we must make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures at the date of the financial statements. Actual results could differ from those estimates. Additionally, the results of operations for the interim periods are not necessarily indicative of the operating results for the full fiscal year or any future periods. For a complete discussion of our significant accounting policies and other information, the unaudited financial statements and notes thereto should be read in conjunction with the audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Cash and Cash Equivalents

Cash and Cash Equivalents

We consider all highly liquid securities, readily convertible to cash, that have original maturities of 90 days or less from the date of purchase to be cash equivalents. The carrying amount reported in the balance sheets for cash is cost, which approximates fair value.

Foreign Currency

Foreign CurrencySales and expenses denominated in foreign currencies are translated at average exchange rates in effect throughout the year. Foreign currency transaction gains and losses are included in other expense, net, in the statements of operations and comprehensive loss. Assets and liabilities of foreign operations are remeasured at period-end exchange rates with the impacts of foreign currency remeasurement recognized in other expense, net in the statements of operations and comprehensive loss.

Investments

Investments

At both March 31, 2022 and December 31, 2021, our long-term investments consisted of U.S. government securities. Investments are reported at their estimated fair market values which are based on quoted, active or inactive market prices when available. Any unrealized gains and losses due to interest rate fluctuations and other external factors are reported as a separate component of accumulated other comprehensive loss. We had $0.2 million and $0.1 million of unrecognized loss in accumulated other comprehensive loss at March 31, 2022 and

December 31, 2021, respectively. Any realized gains and losses are calculated on the specific identification method and reported net in other expense, net in the statements of operations and comprehensive loss. For both of the three months ended March 31, 2022 and 2021, we recognized $0 of realized gains, net.We reassess our estimated credit losses on investments each reporting period. U.S. government securities and cash equivalents are under a "zero-loss exception" for credit losses, meaning no credit loss risk calculation is necessary on those instruments due to the exceptionally low rate of default, which continues to decrease as the securities approach maturity, which for us is no longer than two years. We record changes in the allowance for credit losses for available-for-sale debt securities with a corresponding adjustment in credit loss expense on the statement of operations and comprehensive loss. No reversal of a previously recorded allowance for credit losses may be made to an amount below zero.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

We measure certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents and investments. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. A three-tier fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value:

Level 1: Observable inputs, such as quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2: Inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activities, which would require us to develop our own assumptions.

We use the methods and assumptions described below in determining the fair value of our financial instruments.

Money market funds: Fair values of money market funds are based on quoted market prices in active markets. These are included as Level 1 measurements in the tables below.

U.S. government securities: Consists of U.S. government Treasury bills with original maturities of less than two years. These are included as a Level 1 measurement in the tables below.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash equivalents, investments, and accounts receivable.

Our investment policy limits investments to certain types of debt securities issued by the U.S. government and its agencies, corporations with investment-grade credit ratings, or commercial paper and money market funds issued by the highest quality financial and non-financial companies. We place restrictions on maturities and concentration by type and issuer. We are exposed to credit risk in the event of a default by the issuers of these securities to the extent recorded on the balance sheets. However, as of March 31, 2022 and December 31, 2021, we limited our credit risk associated with cash equivalents by placing investments with banks we believe are highly creditworthy.

We believe that the credit risk in our accounts receivable is mitigated by our credit evaluation process, relatively short collection terms, and dispersion of our customer base. We generally do not require collateral, and losses on accounts receivable have historically not been significant.

Accounts Receivable and Allowance for Expected Credit Losses

Accounts Receivable and Allowance for Expected Credit Losses

Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Customer credit terms are established prior to shipment with the general standard being net 30 days. Collateral or any other security to support payment of these receivables generally is not required.

Each reporting period, we estimate the credit loss related to accounts receivable based on a migration analysis of accounts grouped by individual receivables delinquency status, and apply our historic loss rate adjusted for management's assumption of future market conditions. Any change in the allowance from new receivables acquired, or changes due to credit deterioration on previously existing receivables, is recorded in selling, general and administrative expenses. Write-offs of receivables considered uncollectible are deducted from the allowance. Specific accounts receivable are written-off once a determination is made that the amount is uncollectible. The write-off is recorded in the period in which the account receivable is deemed uncollectible. Recoveries are recognized when received and as a direct credit to earnings or as a reduction to the allowance for credit losses (which would indirectly reduce the loss by decreasing bad debt expense).

Inventories

We regularly review inventory quantities on-hand for excess and obsolete inventory and, when circumstances indicate, incur charges to write down inventories to their net realizable value. The determination of a reserve for excess and obsolete inventory involves management exercising judgment to determine the required reserve, considering future demand, product life cycles, introduction of new products and current market conditions.

Property and Equipment

Depreciation is determined using the straight-line method over the estimated useful lives of the respective assets, generally three to five years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the term of the lease.

Impairment of Long-lived Assets

Impairment of Long-lived Assets

Long-lived assets consist primarily of property and equipment and operating lease right-of-use asset and are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an

asset may not be recoverable. If circumstances require that an asset be tested for possible impairment, we compare the undiscounted cash flows expected to be generated by the asset to the carrying amount of the asset. If the carrying amount of the asset is not recoverable on an undiscounted cash flow basis, we determine the fair value of the asset and recognize an impairment loss to the extent the carrying amount of the asset exceeds its fair value. We determine fair value using the income approach based on the present value of expected future cash flows or other appropriate measures of estimated fair value. Our cash flow assumptions consider historical and forecasted revenue and operating costs and other relevant factors.

Revenue Recognition

Revenue Recognition

We recognize revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606"). Revenues from product sales are recognized when the customer obtains control of the product, which occurs at a point in time, either upon shipment of the product or receipt of the product, depending on shipment terms. Our standard shipping terms are free on board shipping point, unless the customer requests that control and title to the inventory transfer upon delivery. In those cases where shipping and handling costs are billed to customers, we classify the amounts billed as a component of cost of goods sold.

Revenue is measured as the amount of consideration we expect to receive, adjusted for any applicable estimates of variable consideration and other factors affecting the transaction price, which is based on the invoiced price, in exchange for transferring products. All revenue is recognized when we satisfy our performance obligations under the contract. The majority of our contracts have a single performance obligation and are short term in nature.

Sales taxes and value added taxes in foreign jurisdictions that are collected from customers and remitted to governmental authorities are accounted for on a net basis and therefore are excluded from net sales. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of goods sold.

Variable consideration related to certain customer sales incentives is estimated based on the amounts expected to be paid based on the agreement with the customer using probability assessments.

We offer customers a limited right of return for our product in case of non-conformity or performance issues. We estimate the amount of our product sales that may be returned by our customers based on historical sales and returns. As our historical product returns to date have been immaterial, we have not recorded a reduction in revenue related to variable consideration for product returns.

Cost of Goods Sold

Cost of Goods Sold

Cost of goods sold consists primarily of acquisition costs for the components of the Inspire system, overhead costs, scrap and inventory obsolescence, warranty replacement costs, as well as distribution-related expenses such as logistics and shipping costs, net of shipping costs charged to customers. The overhead costs include the cost of material procurement, depreciation expense for production equipment, and operations supervision and management personnel, including employee compensation, stock-based compensation, supplies, and travel.

Research and Development

Research and Development

Research and development expenses consist primarily of product development, clinical and regulatory affairs, quality assurance, consulting services, and other costs associated with products and technologies in development. These expenses include employee compensation, including stock-based compensation, supplies, materials, consulting, and travel expenses related to research and development programs. Clinical expenses include clinical trial design, clinical site reimbursement, data management, travel expenses, and the cost of manufacturing products for clinical trials.

Stock-Based Compensation

Stock-Based Compensation

We maintain an equity incentive plan to provide long-term incentives for eligible employees, consultants, and members of the board of directors. The plan allows for the issuance of restricted stock units ("RSUs"), performance stock units ("PSUs"), and non-statutory and incentive stock options to employees, and RSUs, PSU's, and non-statutory stock options to consultants and directors. We also offer an employee stock purchase plan ("ESPP") which allows participating employees to purchase shares of our common stock at a discount through payroll deductions. We have not granted any stock-based awards to our consultants.

We recognize equity-based compensation expense for awards of equity instruments based on the grant date fair value of those awards in accordance with ASC Topic 718, Stock Compensation ("ASC 718"). ASC 718 requires all equity-based compensation awards, including grants of RSUs, PSUs, and stock options, to be recognized as expense in the statements of operations and comprehensive loss based on their grant date fair values. We estimate the fair value of stock options using the Black-Scholes option pricing model and the fair value of RSUs and PSUs is equal to the closing price of our common stock on the grant date. The fair value of each purchase under the employee stock purchase plan is estimated at the beginning of the offering period using the Black-Scholes option pricing model.

Stock-based compensation expense is recognized on a straight-line basis over the vesting term for stock options and RSUs, and over the vesting and performance period based on the probability of achieving the performance objectives for PSUs. We account for award forfeitures as they occur.

Advertising Expenses

Advertising ExpensesWe expense the costs of advertising, including promotional expenses, as incurred.

Leases

Leases

Operating leases are included in operating lease right-of-use ("ROU") asset, accrued expenses, and operating lease liability – non-current portion in our balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, we use our incremental borrowing rate based on the information available at the lease commencement date as the rate implicit in the lease is not readily determinable. The determination of our incremental borrowing rate requires management judgment based on information available at lease commencement. The operating lease ROU assets also include adjustments for prepayments, accrued lease payments, and exclude lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. Operating lease cost is recognized on a straight-line basis over the expected lease term. Lease agreements entered into after the adoption of ASC 842 that include lease and non-lease components are accounted for as a single lease component. Lease agreements with a noncancelable term of less than 12 months are not recorded on our balance sheets.

Income Taxes

Income Taxes

We account for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect when the differences are expected to reverse. Valuation allowances against deferred tax assets are established, when necessary, to reduce deferred tax assets to the amounts expected to be realized. As we have historically incurred operating losses, we have recorded a full valuation allowance against our net deferred tax assets, and there is no provision for income taxes other than minimal state taxes and an accrual for uncertain tax benefits. Our policy is to record interest and penalties expense related to uncertain tax positions as other expense in the statements of operations and comprehensive loss.

Comprehensive Loss

Comprehensive Loss

Comprehensive loss consists of net loss and changes in unrealized gains and losses due to interest rate fluctuations and other external factors on investments classified as available-for-sale. Accumulated other comprehensive loss is presented in the accompanying balance sheets as a component of stockholders' equity.

Loss Per Share

Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock and dilutive potential shares of common stock outstanding during the period. Because we have reported a net loss for all periods presented, diluted net loss per share is the same as basic net loss per share as all potentially dilutive shares consisting of outstanding stock options, unvested RSUs and PSUs, and shares issuable under our employee stock purchase plan were antidilutive in those periods.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

We have reviewed and considered all recent accounting pronouncements that have not yet been adopted and believe there are none that could potentially have a material impact on our business practices, financial condition, results of operations, or disclosures.

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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following tables set forth by level within the fair value hierarchy our assets that are measured on a recurring basis and reported at fair value as of March 31, 2022 and December 31, 2021. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Fair Value Measurements as of
	March 31, 2022
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,379	$	189,379	$	—	$	—
Total cash equivalents	189,379		189,379		—		—
Investments:
U.S. government securities	9,796		9,796		—		—
Total investments	9,796		9,796		—		—
Total cash equivalents and investments	$	199,175	$	199,175	$	—	$	—

	Fair Value Measurements as of
	December 31, 2021
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	189,369	$	189,369	$	—	$	—
Total cash equivalents	189,369		189,369		—		—
Investments:
U.S. government securities	9,938		9,938		—		—
Total investments	9,938		9,938		—		—
Total cash equivalents and investments	$	199,307	$	199,307	$	—	$	—

Schedule of inventory

Inventories are valued at the lower of cost or net realizable value, computed on a first-in, first-out basis and consisted of the following:

	March 31, 2022		December 31, 2021
Raw materials	$	5,342	$	3,119
Finished goods	16,856		14,112
Total inventories, net of reserves	$	22,198	$	17,231

Schedule of property and equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization and consisted of the following:

	March 31, 2022		December 31, 2021
Computer equipment and software	$	1,500	$	1,397
Manufacturing equipment	5,238		4,436
Other equipment	311		249
Leasehold improvements	281		281
Construction in process	5,415		5,175
Property and equipment, cost	12,745		11,538
Less: accumulated depreciation and amortization	(3,411)		(3,052)
Property and equipment, net	$	9,334	$	8,486

Schedule of accrued expenses

Accrued expenses consisted of the following:

	March 31, 2022		December 31, 2021
Payroll related	$	10,565	$	17,655
Interest	160		160
Product warranty liability	438		468
Operating lease liability, current portion	673		312
Other accrued expenses	2,060		1,859
Total accrued expenses	$	13,896	$	20,454

Schedule of Product Warranty Liability

The following table shows the changes in our estimated product warranty liability accrual, included in accrued liabilities:

	Three Months Ended March 31,
	2022		2021
Balance at beginning of period	$	468	$	159
Accruals of warranties issued	11		178
Settlements of warranty claims	(41)		(71)
Balance at the end of the period	$	438	$	266

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Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Components of Investments Available-for-sale

Our investments are classified as available-for-sale and consist of the following:

	March 31, 2022
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,994	$	—	$	(198)	$	9,796
Long-term investments	$	9,994	$	—	$	(198)	$	9,796

	December 31, 2021
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Long-Term:
U.S. government securities	$	9,993	$	—	$	(55)	$	9,938
Long-term investments	$	9,993	$	—	$	(55)	$	9,938

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Leases (Tables)

3 Months Ended

Mar. 31, 2022

Leases [Abstract]

Lease Balances within the Balance Sheets

The following table presents the lease balances within the balance sheets:

	March 31, 2022		December 31, 2021
Right-of-use assets:
Operating lease right-of-use asset	$	7,659	$	7,919
Operating lease liabilities:
Accrued expenses	673		312
Operating lease liability, non-current portion	8,553		8,796
Total operating lease liabilities	$	9,226	$	9,108

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense recognized

The following table presents the components and classification of stock-based compensation expense:

	Three Months Ended
	March 31,
	2022		2021
Stock options	$	7,761	$	5,657
Restricted stock units	565		19
Performance stock units	1,010		—
Employee stock purchase plan	385		321
Total stock-based compensation expense	$	9,721	$	5,997
Cost of goods sold	$	124	$	79
Research and development	1,767		1,040
Selling, general and administrative	7,830		4,878
Total stock-based compensation expense	$	9,721	$	5,997

Summary of the company's stock option activity and related information

A summary of stock option activity and related information is as follows:

	Options	Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021	2,646,235		$	80.41	7.1	$397,015
Granted	281,554		$	228.40
Exercised	(151,186)		$	20.74		$29,820
Forfeited/expired	(13,388)		$	160.44
Outstanding at March 31, 2022	2,763,215		$	98.37	7.3	$437,730
Exercisable at March 31, 2022	1,510,689		$	49.56	6.3	$312,906

Summary of weighted average assumptions for fair value of options granted

The fair value of options granted to employees and non-employee directors was estimated as of the grant date using the Black-Scholes option pricing model using the following assumptions:

	Three Months Ended
	March 31,
	2022	2021
Expected term (years)	6.25	6.25
Expected volatility	56.6 - 56.9%	55.2 - 55.7%
Risk-free interest rate	1.75 - 2.40%	0.79 - 1.4%
Expected dividend yield	0.0%	0.0%
Weighted average fair value	$125.75	$109.27

Schedule of restricted stock units activity

A summary of RSUs and related information is as follows:

	Restricted Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	2,275		$	201.51	$	524
Granted	59,496		$	230.60
Vested	(569)		$	201.51
Forfeited	(417)		$	227.53
Unvested at March 31, 2022	60,785		$	229.80	$	15,603

Summary of PSU's and related information

A summary of PSUs and related information is as follows:

	Performance Stock Units	Weighted Average Grant Date Fair Value			Aggregate Intrinsic Value (in thousands)
Unvested at December 31, 2021	—		$	—	$	—
Granted	78,351		$	227.53
Unvested at March 31, 2022	78,351		$	227.53	$	20,112

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Segment Reporting and Revenue Disaggregation (Tables)

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Schedule of revenue by geographic region

Revenue by geographic region is as follows:

	Three Months Ended
	March 31,
	2022		2021
United States	$	66,426	$	37,769
All other countries	2,956		2,583
Total revenue	$	69,382	$	40,352

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Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Schedule of dilutive securities excluded from computations of diluted weighted average shares outstanding

The following common stock-based awards were excluded from the computation of diluted net loss per common share for the periods presented because including them would have been anti-dilutive:

	March 31,
	2022	2021
Common stock options outstanding	2,763,215	2,750,375
Unvested restricted stock units	60,785	2,275
Unvested performance stock units	78,351	—
Shares issuable under the ESPP	5,435	5,785
Total	2,907,786	2,758,435

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Summary of Significant Accounting Policies - Investments (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Unrecognized loss in accumulated other comprehensive loss	$ 200,000		$ 100,000
Realized gains, net	0	$ 0
Allowance for credit losses	$ 0		$ 0

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Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - Recurring basis - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Cash equivalents:
Total cash equivalents	$ 189,379	$ 189,369
Investments:
Total investments	9,796	9,938
Total cash equivalents and investments	199,175	199,307
U.S. government securities
Investments:
Total investments	9,796	9,938
Money market funds
Cash equivalents:
Total cash equivalents	189,379
Level 1
Cash equivalents:
Total cash equivalents	189,379	189,369
Investments:
Total investments	9,796	9,938
Total cash equivalents and investments	199,175	199,307
Level 1 | U.S. government securities
Investments:
Total investments	9,796	9,938
Level 1 | Money market funds
Cash equivalents:
Total cash equivalents	189,379
Level 2
Cash equivalents:
Total cash equivalents	0	0
Investments:
Total investments	0	0
Total cash equivalents and investments	0	0
Level 2 | U.S. government securities
Investments:
Total investments	0	0
Level 2 | Money market funds
Cash equivalents:
Total cash equivalents	0
Level 3
Cash equivalents:
Total cash equivalents	0	0
Investments:
Total investments	0	0
Total cash equivalents and investments	0	0
Level 3 | U.S. government securities
Investments:
Total investments	0	$ 0
Level 3 | Money market funds
Cash equivalents:
Total cash equivalents	$ 0

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Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Raw materials	$ 5,342	$ 3,119
Finished goods	16,856	14,112
Total inventories, net of reserves	22,198	17,231
Reserve for excess and obsolete inventory	$ 400	$ 300

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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property and Equipment
Property and equipment, cost	$ 12,745		$ 11,538
Less: accumulated depreciation and amortization	(3,411)		(3,052)
Property and equipment, net	9,334		8,486
Depreciation and amortization expenses	400	$ 200
Computer equipment and software
Property and Equipment
Property and equipment, cost	1,500		1,397
Manufacturing equipment
Property and Equipment
Property and equipment, cost	5,238		4,436
Other equipment
Property and Equipment
Property and equipment, cost	311		249
Leasehold improvements
Property and Equipment
Property and equipment, cost	281		281
Construction in process
Property and Equipment
Property and equipment, cost	$ 5,415		$ 5,175
Minimum
Property and Equipment
Estimated useful lives	3 years
Maximum
Property and Equipment
Estimated useful lives	5 years

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Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Payroll related	$ 10,565	$ 17,655
Interest	160	160
Product warranty liability	438	468
Operating lease liability, current portion	673	312
Other accrued expenses	2,060	1,859
Total accrued expenses	$ 13,896	$ 20,454

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Summary of Significant Accounting Policies - Product Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounting Policies [Abstract]
Balance at beginning of period	$ 468	$ 159
Accruals of warranties issued	11	178
Settlements of warranty claims	(41)	(71)
Balance at the end of the period	$ 438	$ 266

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Summary of Significant Accounting Policies - Advertising Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Advertising Expenses
Advertising expenses	$ 15.5	$ 9.0

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Investments (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Investments with maturity greater than one year	$ 0	$ 0
Long-term Debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,994,000	9,993,000
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(198,000)	(55,000)
Fair Value	9,796,000	9,938,000
U.S. government securities | Long-term Debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,994,000	9,993,000
Unrealized Gross Gains	0	0
Unrealized Gross Losses	(198,000)	(55,000)
Fair Value	$ 9,796,000	$ 9,938,000

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Leases - Narrative (Details) ft² in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) ft² renewal_option	Mar. 31, 2021 USD ($)
Leases [Abstract]
Operating lease, office space (square feet) | ft²	70
Number of renewal options | renewal_option	1
Renewal term	5 years
Incentive from landlord, rent abatement	$ 2,300
Remaining lease term	6 years 2 months 12 days
Discount rate	5.30%
Operating lease payments (less than)	$ 100	$ 100

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Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Right-of-use assets:
Operating lease right-of-use asset	$ 7,659	$ 7,919
Operating lease liabilities:
Accrued expenses	673	312
Operating lease liability, non-current portion	8,553	8,796
Total operating lease liabilities	$ 9,226	$ 9,108
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses	Accrued expenses

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Long-Term Debt (Details) - USD ($)	1 Months Ended
	Mar. 31, 2019	Mar. 31, 2022	Mar. 27, 2019
Credit Facility
Outstanding under credit facility		$ 24,500,000
Term loan facility
Credit Facility
Increase in interest rate in default		5.00%
Term loan facility | March 2019 Amendment to Loan and Security Agreement
Credit Facility
Maximum borrowing amount under credit facility	$ 24,500,000
Final payment percentage			3.50%
Prepayment fee			1.00%
Term loan facility | Minimum | March 2019 Amendment to Loan and Security Agreement
Credit Facility
Basic interest rate	7.60%

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Employee Retirement Plan (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2022	Mar. 31, 2022
Retirement Benefits [Abstract]
Employer matching contribution, percent of employees' contribution	50.00%
Employee contribution, maximum eligible for employer match, percent	6.00%
Employer matching contribution, percent of employees' earnings	3.00%
Employer discretionary contribution		$ 700

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Jan. 01, 2019	Dec. 31, 2018
Stock Options
Unearned stock-based compensation	$ 94.2
Weighted average recognition period	2 years 6 months
Options
Stock Options
Contractual life of stock options	10 years
Options | Directors | Minimum
Stock Options
Service period	1 year
Options | Directors | Maximum
Stock Options
Service period	3 years
Options | Vesting after first year of service
Stock Options
Service period	4 years
Percentage of shares to vest	25.00%
Options | Vesting in years two through four
Stock Options
Vesting period	36 months
Stock Incentive Plan 2018
Stock Options
Number of shares reserved for issuance (in shares)	3,953,906		1,386,809
Number of additional shares reserved for issuance, maximum (in shares)		739,631
Number of additional shares reserved for issuance, percentage, maximum		4.00%
Number of shares available for issuance (in shares)	1,605,667

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Stock-Based Compensation - Stock-Based Compensation Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock Options
Total stock-based compensation expense	$ 9,721	$ 5,997
Cost of goods sold
Stock Options
Total stock-based compensation expense	124	79
Research and development
Stock Options
Total stock-based compensation expense	1,767	1,040
Selling, general and administrative
Stock Options
Total stock-based compensation expense	7,830	4,878
Stock options
Stock Options
Total stock-based compensation expense	7,761	5,657
Restricted stock units
Stock Options
Total stock-based compensation expense	565	19
Performance stock units
Stock Options
Total stock-based compensation expense	1,010	0
Employee stock purchase plan
Stock Options
Total stock-based compensation expense	$ 385	$ 321

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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Options
Outstanding at beginning of the year (in shares)	2,646,235
Granted (in shares)	281,554
Exercised (in shares)	(151,186)
Forfeited/expired (in shares)	(13,388)
Outstanding at ending of the year (in shares)	2,763,215	2,646,235
Exercisable (in shares)	1,510,689
Weighted Average Exercise Price
Outstanding, beginning of the period (in dollars per share)	$ 80.41
Granted (in dollars per share)	228.40
Exercised (in dollars per share)	20.74
Forfeited/expired (in dollars per share)	160.44
Outstanding, end of the period (in dollars per share)	98.37	$ 80.41
Exercisable (in dollars per share)	$ 49.56
Weighted Average Remaining Contractual Term
Outstanding	7 years 3 months 18 days	7 years 1 month 6 days
Exercisable	6 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding, beginning of period	$ 397,015
Exercised	29,820
Outstanding, end of period	437,730	$ 397,015
Exercisable	$ 312,906

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Stock-Based Compensation - Assumptions Used to Calculate Fair Value of Options (Details) - Options - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Weighted average assumptions
Expected dividend yield	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 125.75	$ 109.27
Minimum
Weighted average assumptions
Expected term (years)	6 years 3 months	6 years 3 months
Expected volatility	56.60%	55.20%
Risk-free interest rate	1.75%	0.79%
Maximum
Weighted average assumptions
Expected volatility	56.90%	55.70%
Risk-free interest rate	2.40%	1.40%

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Stock-Based Compensation - Restricted Stock Units (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Restricted Stock Units
Vested (in shares)	(569)
Aggregate Intrinsic Value
Unearned stock-based compensation | $	$ 94,200
Weighted average recognition period	2 years 6 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	3 years
Restricted Stock Units
Unvested at beginning of period (in shares)	2,275
Granted (in shares)	59,496
Vested (in shares)	(569)
Forfeited (in shares)	(417)
Unvested at end of period (in shares)	60,785
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share) | $ / shares	$ 201.51
Granted (in dollars per share) | $ / shares	230.60
Vested (in dollars per share) | $ / shares	201.51
Forfeited (in dollars per share) | $ / shares	227.53
Unvested at end of period (in dollars per share) | $ / shares	$ 229.80
Aggregate Intrinsic Value
Unvested at beginning of period | $	$ 524
Unvested at end of period | $	15,603
Unearned stock-based compensation | $	$ 13,400
Weighted average recognition period	2 years 10 months 24 days

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Stock-Based Compensation - Performance Stock Units (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Aggregate Intrinsic Value
Unearned stock-based compensation	$ 94,200
Weighted average recognition period	2 years 6 months
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenue goal, performance period	3 years
Restricted Stock Units
Unvested at beginning of period (in shares) | shares	0
Granted (in shares) | shares	78,351
Unvested at end of period (in shares) | shares	78,351
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	227.53
Unvested at end of period (in dollars per share) | $ / shares	$ 227.53
Aggregate Intrinsic Value
Unvested at beginning of period	$ 0
Unvested at end of period	20,112
Unearned stock-based compensation	$ 23,100
Weighted average recognition period	3 years
Performance stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target, percentage	0.00%
Performance stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target, percentage	200.00%

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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - shares	3 Months Ended
	Mar. 31, 2022	Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, percent	85.00%
Number of shares reserved for issuance (in shares)	929,504	277,362
Number of additional shares reserved for issuance, maximum (in shares)		184,908
Number of additional shares reserved for issuance, percentage, maximum		1.00%

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Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 100,000	$ 23,000
Unrecognized tax benefits	100,000		$ 100,000
Significant change to unrecognized tax benefits over the next 12 months	$ 0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			286,300,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			198,200,000
R&D credit
Operating Loss Carryforwards [Line Items]
Credit carryforwards			$ 6,700,000

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Segment Reporting and Revenue Disaggregation (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | segment	1
Segment Reporting and Significant Customers
Revenue	$ 69,382	$ 40,352
United States
Segment Reporting and Significant Customers
Revenue	66,426	37,769
All other countries
Segment Reporting and Significant Customers
Revenue	$ 2,956	$ 2,583

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Loss Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Loss Per Share
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	2,907,786	2,758,435
Common stock options outstanding
Loss Per Share
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	2,763,215	2,750,375
Unvested restricted stock units
Loss Per Share
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	60,785	2,275
Unvested performance stock units
Loss Per Share
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	78,351	0
Shares issuable under the ESPP
Loss Per Share
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	5,435	5,785

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Subsequent Event (Details) $ in Millions	Apr. 27, 2022 USD ($)
Subsequent Event | EnsoData, Inc
Subsequent Event [Line Items]
Investment in private company	$ 10.0