Rapid Micro Biosystems (RPID) 10-Q 12 Aug 22 2022 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Aug. 08, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2022
Entity File Number	001-40592
Entity Registrant Name	Rapid Micro Biosystems, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8121647
Entity Address State Or Province	MA
Entity Address, Address Line One	1001 Pawtucket Boulevard West
Entity Address, Address Line Two	Suite 280
Entity Address, City or Town	Lowell
Entity Address, Postal Zip Code	01854
City Area Code	978
Local Phone Number	349-3200
Title of 12(b) Security	Class A common stock, $0.01 par value per share
Trading Symbol	RPID
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001380106
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		36,389,073
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,553,379

Condensed consolidated balance

Condensed consolidated balance sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 49,720	$ 178,387
Short-term investments	94,371	15,110
Accounts receivable	4,100	5,005
Inventory	21,293	15,671
Prepaid expenses and other current assets	1,999	3,951
Total current assets	171,483	218,124
Property and equipment, net	12,649	11,304
Right-of-use assets, net	7,530
Long-term investments	22,816	9,966
Other long-term assets	1,381	1,491
Restricted cash	284	284
Total assets	216,143	241,169
Current liabilities:
Accounts payable	2,822	3,944
Accrued expenses and other current liabilities	5,281	10,917
Deferred revenue	3,918	3,305
Lease liabilities, short-term	729
Total current liabilities	12,750	18,166
Deferred rent, long term		813
Lease liabilities, long-term	7,728
Other long-term liabilities	698	1,210
Total liabilities	21,176	20,189
Commitments and contingencies (Note 17)
Stockholders' equity:
Preferred stock, $0.01 par value: 10,000,000 shares authorized at June 30, 2022 and December 31, 2021; zero shares issued and outstanding at June 30, 2022 and December 31, 2021
Additional paid-in capital	538,598	535,693
Accumulated deficit	(343,132)	(315,112)
Accumulated other comprehensive loss	(919)	(16)
Total stockholders' equity	194,967	220,980
Total liabilities and stockholders' equity	216,143	241,169
Common Class A
Stockholders' equity:
Common stock	365	346
Common Class B
Stockholders' equity:
Common stock	$ 55	$ 69

Condensed consolidated balanc_2

Condensed consolidated balance sheets (Parentheticals) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	210,000,000	210,000,000
Common stock, issued (in shares)	36,389,073	34,564,040
Common stock, outstanding (in shares)	36,389,073	34,564,040
Common Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	10,000,000	10,000,000
Common stock, issued (in shares)	5,553,379	6,903,379
Common stock, outstanding (in shares)	5,553,379	6,903,379

Condensed consolidated statemen

Condensed consolidated statements of operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue:
Total revenue	$ 3,860	$ 6,130	$ 8,020	$ 11,125
Costs and operating expenses:
Research and development	2,965	2,337	6,490	4,485
Sales and marketing	3,484	3,122	6,940	5,397
General and administrative	6,404	3,625	12,498	6,827
Total costs and operating expenses	17,934	16,992	37,093	31,678
Loss from operations	(14,074)	(10,862)	(29,073)	(20,553)
Other income (expense):
Interest expense	(10)	(924)	(21)	(1,856)
Change in fair value of preferred stock warrant liability		(35)		(11,483)
Other income (expense), net	381	8	484	(3)
Total other income (expense), net	371	(951)	463	(13,342)
Loss before income taxes	(13,703)	(11,813)	(28,610)	(33,895)
Income tax (benefit) expense	(613)	18	(590)	37
Net loss	(13,090)	(11,831)	(28,020)	(33,932)
Accretion of redeemable convertible preferred stock to redemption value		(1,184)		(1,971)
Cumulative redeemable convertible preferred stock dividends		(885)		(2,296)
Net loss attributable to common stockholders - basic	(13,090)	(13,900)	(28,020)	(38,199)
Net loss attributable to common stockholders - diluted	$ (13,090)	$ (13,900)	$ (28,020)	$ (38,199)
Net loss per share attributable to common stockholders - basic	$ (0.31)	$ (20.01)	$ (0.66)	$ (57.17)
Net loss per share attributable to common stockholders - diluted	$ (0.31)	$ (20.01)	$ (0.66)	$ (57.17)
Weighted average common shares outstanding - basic	42,494,055	694,698	42,346,607	668,180
Weighted average common shares outstanding - diluted	42,494,055	694,698	42,346,607	668,180
Product revenue
Revenue:
Total revenue	$ 2,440	$ 4,088	$ 5,003	$ 7,806
Costs and operating expenses:
Cost of revenue	3,235	6,092	7,593	11,602
Service revenue
Revenue:
Total revenue	1,420	1,606	3,017	2,673
Costs and operating expenses:
Cost of revenue	$ 1,846	1,344	$ 3,572	2,481
Non-commercial revenue
Revenue:
Total revenue		436		646
Costs and operating expenses:
Cost of revenue		$ 472		$ 886

Condensed consolidated statem_2

Condensed consolidated statements of comprehensive loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed consolidated statements of comprehensive loss
Net loss	$ (13,090)	$ (11,831)	$ (28,020)	$ (33,932)
Other comprehensive income:
Unrealized loss on short-term investments, net of tax	(315)	(1)	(903)	(1)
Comprehensive loss	$ (13,405)	$ (11,832)	$ (28,923)	$ (33,933)

Condensed consolidated statem_3

Condensed consolidated statements of stockholders' equity - USD ($) $ in Thousands	Common Stock Common Class A	Common Stock Common Class B	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Series D1 Redeemable Convertible Preferred Stock	Series D2 Redeemable Convertible Preferred Stock	Total
Balance at Dec. 31, 2020								$ 151,826
Balance (shares) at Dec. 31, 2020								133,021,640
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock, net of issuance costs						$ 78,338	$ 1,470
Issuance of redeemable convertible preferred stock, net of issuance costs (in shares)						22,086,725	413,268
Accretion of redeemable convertible preferred stock to redemption value								$ 787
Cumulative redeemable convertible preferred stock dividends								1,411
Balance at Mar. 31, 2021								$ 233,832
Balance (shares) at Mar. 31, 2021								155,521,633
Balance at Dec. 31, 2020	$ 6		$ 114,575	$ (241,588)	$ 1			$ (127,006)
Balance (shares) at Dec. 31, 2020	612,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of common stock options	$ 1		66					67
Issuance of Class A common stock upon exercise of common stock options (In shares)	67,418
Accretion of redeemable convertible preferred stock to redemption value			(787)					(787)
Cumulative redeemable convertible preferred stock dividends			(1,411)					(1,411)
Issuance of restricted Class A common stock awards	$ 2		(2)
Issuance of restricted Class A common stock awards (in shares)	248,903
Stock-based compensation expense			191					191
Net loss				(22,101)				(22,101)
Balance at Mar. 31, 2021	$ 9		112,632	(263,689)	1			(151,047)
Balance (shares) at Mar. 31, 2021	929,171
Balance at Dec. 31, 2020								$ 151,826
Balance (shares) at Dec. 31, 2020								133,021,640
Balance at Jun. 30, 2021								$ 235,836
Balance (shares) at Jun. 30, 2021								155,521,633
Balance at Dec. 31, 2020	$ 6		114,575	(241,588)	1			$ (127,006)
Balance (shares) at Dec. 31, 2020	612,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss								(33,932)
Balance at Jun. 30, 2021	$ 10		110,984	(275,520)				(164,526)
Balance (shares) at Jun. 30, 2021	966,317
Balance at Mar. 31, 2021								$ 233,832
Balance (shares) at Mar. 31, 2021								155,521,633
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance Costs						$ (64)	$ (1)
Accretion of redeemable convertible preferred stock to redemption value								$ 1,184
Cumulative redeemable convertible preferred stock dividends								885
Balance at Jun. 30, 2021								$ 235,836
Balance (shares) at Jun. 30, 2021								155,521,633
Balance at Mar. 31, 2021	$ 9		112,632	(263,689)	1			$ (151,047)
Balance (shares) at Mar. 31, 2021	929,171
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of common stock options	$ 1		31					32
Issuance of Class A common stock upon exercise of common stock options (In shares)	37,146
Accretion of redeemable convertible preferred stock to redemption value			(1,184)					(1,184)
Cumulative redeemable convertible preferred stock dividends			(885)					(885)
Stock-based compensation expense			390					390
Net loss				(11,831)				(11,831)
Other comprehensive income					(1)			(1)
Balance at Jun. 30, 2021	$ 10		110,984	(275,520)				(164,526)
Balance (shares) at Jun. 30, 2021	966,317
Balance at Dec. 31, 2021	$ 346	$ 69	535,693	(315,112)	(16)			220,980
Balance (shares) at Dec. 31, 2021	34,564,040	6,903,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class B common stock to Class A common stock	$ 14	$ (14)
Conversion of Class B common stock to Class A common stock (in shares)	1,350,000	(1,350,000)
Restricted stock award liability accretion			154					154
Issuance of Class A common stock upon exercise of common stock options	$ 5		466					471
Issuance of Class A common stock upon exercise of common stock options (In shares)	475,033
Stock-based compensation expense			983					983
Net loss				(14,930)				(14,930)
Other comprehensive income					(588)			(588)
Balance at Mar. 31, 2022	$ 365	$ 55	537,296	(330,042)	(604)			207,070
Balance (shares) at Mar. 31, 2022	36,389,073	5,553,379
Balance at Dec. 31, 2021	$ 346	$ 69	535,693	(315,112)	(16)			$ 220,980
Balance (shares) at Dec. 31, 2021	34,564,040	6,903,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of common stock options (In shares)								475,033
Net loss								$ (28,020)
Balance at Jun. 30, 2022	$ 365	$ 55	538,598	(343,132)	(919)			194,967
Balance (shares) at Jun. 30, 2022	36,389,073	5,553,379
Balance at Mar. 31, 2022	$ 365	$ 55	537,296	(330,042)	(604)			207,070
Balance (shares) at Mar. 31, 2022	36,389,073	5,553,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock award liability accretion			44					44
Stock-based compensation expense			1,258					1,258
Net loss				(13,090)				(13,090)
Other comprehensive income					(315)			(315)
Balance at Jun. 30, 2022	$ 365	$ 55	$ 538,598	$ (343,132)	$ (919)			$ 194,967
Balance (shares) at Jun. 30, 2022	36,389,073	5,553,379

Condensed consolidated statem_4

Condensed consolidated statements of stockholders' equity (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Series D1 Redeemable Convertible Preferred Stock
Issuance costs	$ 1,278
Series D2 Redeemable Convertible Preferred Stock
Issuance costs	$ 19

Condensed consolidated statem_5

Condensed consolidated statements of cash flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (28,020)	$ (33,932)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	1,243	696
Stock-based compensation expense	2,241	581
Change in fair value of preferred stock warrant liability		11,483
Provision recorded for inventory	49	38
Noncash lease expense	549
Noncash interest expense		295
Loss (gain) on disposal of property and equipment	19	(18)
Accretion on investments	(22)	(4)
Other	(125)
Changes in operating assets and liabilities
Accounts receivable	905	1,931
Inventory	(5,671)	(2,984)
Prepaid expenses and other current assets	1,952	(43)
Other long-term assets	84	(172)
Accounts payable	(1,122)	(1,894)
Accrued expenses and other current liabilities	(4,482)	1,373
Deferred revenue	613	(56)
Deferred rent, long term		(62)
Net cash used in operating activities	(31,787)	(22,768)
Cash flows from investing activities:
Purchases of property and equipment	(4,342)	(792)
Proceeds from sale of property and equipment		20
Purchases of investments	(117,993)
Maturity of investments	25,000	15,000
Net cash (used) provided by investing activities	(97,335)	14,228
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		79,743
Proceeds from issuance of Class A common stock upon stock option exercise	471	287
Proceeds from issuance of restricted Class A stock award		523
Payments on finance lease obligations	(16)
Payments of deferred offering costs		(1,861)
Net cash provided by financing activities	455	78,692
Net (decrease) increase in cash, cash equivalents and restricted cash	(128,667)	70,152
Cash, cash equivalents and restricted cash at beginning of period	178,671	30,179
Cash, cash equivalents and restricted cash at end of period	50,004	100,331
Supplemental disclosure of cash flow information
Cash paid for interest	21	1,098
Supplemental disclosure of non-cash investing activities
Establishment of right of use operating assets	7,605
Purchases of property and equipment in accounts payable	380	110
Supplemental disclosure of non-cash financing activities
Establishment of right of use finance assets	$ 366
Deferred offering costs included in accounts payable and accrued expenses		780
Accretion of redeemable convertible preferred stock to redemption value		1,971
Cumulative redeemable convertible preferred stock dividends		$ 2,296

Nature of the business and basi

Nature of the business and basis of presentation	6 Months Ended
	Jun. 30, 2022
Nature of the business and basis of presentation
Nature of the business and basis of presentation	1. Nature of the business and basis of presentation Rapid Micro Biosystems, Inc. (the “Company”) was incorporated under the laws of the State of Delaware on December 29, 2006. The Company develops, manufactures, markets and sells Growth Direct systems (“Systems”) proprietary consumables, laboratory information management system (“LIMS”) connection software, and services to address rapid microbial analysis used for quality control in the manufacture of pharmaceuticals, medical devices and personal care products. The Company’s technology uses a highly sensitive camera and the natural auto fluorescence of living cells to identify and quantify microbial growth faster and more accurately than the traditional method, which relies on the human eye. The Company currently sells to customers in North America, Europe and Asia. The Company is headquartered in Lowell, Massachusetts. In March 2020, the World Health Organization declared the global novel coronavirus disease 2019 (“COVID-19”) outbreak a pandemic. The impact of this pandemic has been and may continue to be extensive in many aspects of society, which has resulted in and may continue to result in significant disruptions to the global economy, as well as businesses and capital markets around the world. The Company cannot at this time predict the ultimate extent, duration, or full impact that the COVID-19 pandemic will have on its future financial condition and operations. The impact of the ongoing COVID-19 pandemic on the Company’s financial performance will depend on future developments, including the duration and spread of the pandemic and related governmental advisories and restrictions. These developments and the impact of COVID-19, and its variants, on the financial markets and the overall economy are highly uncertain and cannot be predicted. If the financial markets and/or the overall economy are impacted for an extended period, the Company’s results may be materially adversely affected. Future impacts to the Company’s business as a result of COVID-19, and its variants, could include disruptions to the Company’s manufacturing operations and supply chain caused by facility closures, reductions in operating hours, staggered shifts and other social distancing efforts; labor shortages; decreased productivity and unavailability of materials or components; limitations on its employees’ and customers’ ability to travel, and delays in shipments to and from affected countries and within the United States. While the Company maintains an inventory of finished products and raw materials used in its products, the effects of the ongoing COVID-19 pandemic could still lead to shortages in the raw materials necessary to manufacture its products. Basis of presentation These condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the accounts of the Company and its wholly owned subsidiaries in Germany and Switzerland. All intercompany accounts and transactions have been eliminated in consolidation. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s audited consolidated financial statements for the year ended December 31, 2021. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2022 and the results of its operations and its cash flows for the three and six months ended June 30, 2022 and 2021. The financial data and other information disclosed in these notes related to the three and six months ended June 30, 2022 and 2021 are also unaudited. The results for the three and six months ended June 30, 2022 are not necessarily indicative of results to be expected for the year ending December 31, 2022, any other interim periods, or any future year or period. Reverse split On July 9, 2021, the Company effected a one Initial public offering On July 19, 2021, the Company closed an initial public offering (“IPO”) of its Class A common stock, which resulted in the sale of 7,920,000 shares of its Class A common stock at the initial public offering price of $20.00 per share, before underwriting discounts. The offering resulted in gross proceeds of $158.4 million and net proceeds to the Company of $143.8 million from the IPO after deducting underwriting discounts, commissions and offering expenses payable by the Company. On August 4, 2021, the underwriters exercised their overallotment option in part and purchased 1,086,604 shares of Class A common stock at the initial public offering price of $20.00 per share less underwriting discounts and commissions. The overallotment option exercise resulted in net proceeds of $20.2 million. Liquidity The Company has incurred recurring losses and net cash outflows from operations since its inception. The Company expects to continue to generate significant operating losses for the foreseeable future. The Company expects that its existing cash and cash equivalents and investments will be sufficient to fund its operating expenses and capital expenditure requirements for at least twelve months following the date these unaudited interim condensed consolidated financial statements were issued.

Summary of significant accounti

Summary of significant accounting policies	6 Months Ended
	Jun. 30, 2022
Summary of significant accounting policies
Summary of significant accounting policies	2. Use of estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, calculating the standalone selling price for revenue recognition, the valuation of inventory, the valuation of common stock and stock-based awards, and the valuation of the preferred stock warrant liability. The Company bases its estimates on historical experience, known trends and other market-specific and relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates. Due to the COVID-19 pandemic, there has been uncertainty and disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities. These estimates may change as new events occur and additional information is obtained. Other than policies noted below, there have been no significant changes to the significant accounting policies during the three and six months ended June 30, 2022, as compared to the significant accounting policies disclosed in Note 2 of the audited consolidated financial statements as of December 31, 2021 filed with the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021. Risk of concentrations of credit, significant customers and significant suppliers Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term and long-term investments and accounts receivable. Periodically, the Company maintains deposits in accredited financial institutions in excess of federally insured limits. The Company maintains its cash and cash equivalents and investments with financial institutions that management believes to be of high credit quality. The Company has not experienced any other-than-temporary losses with respect to its cash equivalents and investments and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. Significant customers are those which represent more than 10% of the Company’s total revenue or accounts receivable balance at each respective balance sheet date. The following table presents customers that represent 10% or more of the Company’s total revenue: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ 2022 2021 2022 2021 Customer A 28.3 % * ​ 21.7 % * ​ Customer B ​ 15.0 % * ​ ​ * ​ * ​ Customer C ​ 14.0 % * ​ ​ * ​ * ​ Customer D ​ * ​ * ​ ​ * ​ 13.7 % Customer E * ​ 15.9 % * ​ * ​ ​ 57.3 % 15.9 % 21.7 % 13.7 % * – less than 10% The following table presents customers that represent 10% or more of the Company’s accounts receivable: ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ 2022 2021 Customer A ​ 20.4 % 19.5 % Customer B ​ 15.9 % 12.6 % Customer C 14.1 % * ​ Customer F ​ 12.7 % * ​ Customer G ​ * ​ 10.6 % Customer H * ​ 10.0 % ​ 63.1 % 52.7 % * – less than 10% Debt issuance costs The Company capitalizes certain legal and other third-party fees that are directly associated with the issuance of debt as debt issuance costs. Debt issuance costs are recorded as a direct reduction of the carrying amount of the associated debt on the condensed consolidated balance sheets and amortized as interest expense on the condensed consolidated statements of operations using the effective interest method, which approximates the straight-line method. As of June 30, 2022 and December 31, 2021, the Company had no debt issuance costs on its condensed consolidated balance sheets. During the three months ended June 30, 2022 and 2021, the Company recorded zero and $0.1 million, respectively, and during the six months ended June 30, 2022 and 2021, the Company recorded zero and $0.2 million, respectively, of interest expense related to amortization of debt issuance costs in the condensed consolidated statements of operations. Cash equivalents The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be cash equivalents. Cash equivalents that are readily convertible to cash are stated at cost, which approximates fair value. At June 30, 2022 and December 31, 2021, the Company held cash of $0.3 million in banks located outside of the United States. Restricted cash As of June 30, 2022 and December 31, 2021, the Company was required to maintain guaranteed investment certificates of $0.3 million with maturities of three months to one year that are subject to an insignificant risk of changes in value. The guaranteed investment certificates are held for the benefit of the landlord in connection with an operating lease which has a remaining term of greater than one year and are classified as restricted cash (non-current) on the Company’s consolidated balance sheets. Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, “Internal-Use Software . For the three months ended June 30, 2022 and 2021, there was Fair value measurements Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: ● Level 1—Quoted prices in active markets for identical assets or liabilities. ● Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. ● Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The Company’s cash equivalents, short-term and long-term investments are carried at fair value, determined according to the fair value hierarchy described above (see Note 3). The carrying values of the Company’s accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities. Product warranties The Company offers a one-year limited assurance warranty on System sales, which is included in the selling price. The warranty accrual is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets. The following table presents a summary of changes in the amount reserved for warranty cost (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Balance, beginning of period ​ $ 595 ​ $ 618 ​ $ 598 ​ $ 637 Warranty provisions ​ ​ 341 ​ ​ — ​ ​ 351 ​ ​ — Warranty repairs ​ — ​ (6) ​ (13) ​ (25) Balance, end of period ​ $ 936 ​ $ 612 ​ $ 936 ​ $ 612 ​ Segment information The Company determined its operating segment after considering the Company’s organizational structure and the information regularly reviewed and evaluated by the Company’s chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. The Company has determined that its CODM is its Chief Executive Officer. The CODM reviews the financial information on a consolidated basis for purposes of evaluating financial performance and allocating resources. On the basis of these factors, the Company determined that it operates and manages its business as one operating segment, that develops, manufactures, markets and sells Systems and related LIMS connection software, consumables and services; and accordingly has one reportable segment for financial reporting purposes. Substantially all of the Company’s long-lived assets are held in the United States. Revenue recognition Remaining performance obligations The Company does not disclose the value of remaining performance obligations for (i) contracts with an original contract term of one year or less, (ii) contracts for which the Company recognizes revenue at the amount to which it has the right to invoice when that amount corresponds directly with the value of services performed, and (iii) Contract balances from contracts with customers Contract assets arise from unbilled amounts in customer arrangements when revenue recognized exceeds the amount billed to the customer and the Company’s right to payment is conditional and not only subject to the passage of time. The Company had $0.1 million and $0.3 million in contract assets as of June 30, 2022 and December 31, 2021, respectively, included in prepaid expenses and other current assets. These balances relate to unbilled amounts with commercial customers, as well as amounts due under the BARDA (as defined below) agreements. Contract liabilities represent the Company’s obligation to transfer goods or services to a customer for which it has received consideration (or the amount is due) from the customer. The Company has a contract liability related to service revenue, which consists of amounts that have been invoiced but that have not been recognized as revenue. Amounts expected to be recognized as revenue within 12 months of the balance sheet date are classified as current deferred revenue and amounts expected to be recognized as revenue beyond 12 months of the balance sheet date are classified as noncurrent deferred revenue. The Company did not record any non-current deferred revenue as of June 30, 2022 or December 31, 2021. Deferred revenue was $3.9 million and $3.3 million at June 30, 2022 and December 31, 2021, respectively. Revenue recognized during the three months ended June 30, 2022 and 2021 that was included in deferred revenue at the prior period-end was $0.8 million and $1.6 million, respectively. Revenue recognized during the six months ended June 30, 2022 and 2021 that was included in deferred revenue at the prior period-end was $1.9 million and $2.8 million, respectively. Non-commercial revenue The Company has historically generated revenue from a long-term contract with the U.S. Department of Health and Human Services Biomedical Advanced Research and Development Authority (“BARDA”) a part of the U.S. government. The Company’s contracts with the U.S. government typically are subject to the Federal Acquisition Regulation (“FAR”) and are priced based on estimated or actual costs of producing goods or providing services. The FAR provides guidance on the types of costs that are allowable in establishing prices for goods or services provided under U.S. government contracts. In September 2017, the Company signed a contract with BARDA, which was subsequently modified on multiple occasions to increase the contract value and adjust the cost share reimbursement rate. Modifications were accounted for in accordance with the contract modification framework. The contract is a cost-reimbursable, cost- sharing arrangement, whereby BARDA reimburses the Company for a percentage of the total costs that have been incurred including indirect allowable costs. All funding under this contract was fully earned by the fourth quarter of 2021. Disaggregated revenue The Company disaggregates revenue based on the recurring and non-recurring, and commercial and non-commercial, nature of the underlying sale. Recurring revenue includes sales of consumables and service contracts. Non-recurring revenue includes sales of Systems, LIMS connection software, validation services, field service, and revenue under the Company’s contract with BARDA. The following table presents the Company’s revenue by the recurring or non-recurring and commercial or non-commercial nature of the revenue stream (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Product and service revenue — recurring ​ $ 2,500 ​ $ 1,904 ​ $ 5,158 ​ $ 3,368 Product and service revenue — non-recurring ​ 1,360 ​ 3,790 ​ 2,862 ​ 7,111 Non-commercial revenue — non-recurring ​ — ​ 436 ​ — ​ 646 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125 The following table presents the Company’s revenue by customer geography (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 United States ​ $ 2,319 ​ $ 3,446 ​ $ 4,361 ​ $ 5,773 Germany ​ 401 ​ 636 ​ 825 ​ 965 Switzerland ​ 609 ​ 1,048 ​ 1,488 ​ 2,090 All other countries ​ 531 ​ ​ 1,000 ​ ​ 1,346 ​ ​ 2,297 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125 ​ Advertising costs Advertising costs are expensed as incurred and are included in sales and marketing expenses in the condensed consolidated statements of operations. Advertising costs were less than $0.1 million during the three and six months ended June 30, 2022 and 2021. Stock-based compensation The Company measures all stock-based awards granted to employees, officers and directors based on their fair value on the date of the grant and recognizes compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award. The Company issues stock-based awards with only service-based vesting conditions and records the expense for these awards using the straight-line method. Forfeitures are accounted for prospectively as they occur. The Company measures all restricted common stock and restricted stock units granted to employees based on the common stock value on the date of grant. The purchase price of the restricted common stock is the common stock value on the date of grant. The restricted common stock includes a repurchase right, whereas upon the occurrence of a specific event, the Company shall have the right to repurchase unvested restricted common stock shares. At June 30, 2022 and December 31, 2021, the Company had $0.3 million and $0.5 million, respectively, in unvested restricted Class A common stock liability included in other long-term liabilities. Comprehensive loss Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than those with stockholders. For the three months ended June 30, 2022 and 2021, there were $0.3 million and less than $0.1 million, respectively, and for the six months ended June 30, 2022 and 2021, there were $0.9 million and less than $0.1 million, respectively, of unrealized losses on short-term and long-term investments, net of tax. Recently adopted accounting pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ​ The Company leases office and manufacturing space under operating lease agreements. The Company leases furniture under a financing agreement. The Company adopted Topic 842 on January 1, 2022 using the optional transition method to the modified retrospective approach. Under this transition provision, results for reporting periods beginning on January 1, 2022 are presented under Topic 842 while prior period amounts continue to be reported and disclosed in accordance with the Company’s historical accounting treatment under ASC Topic 840, Leases ​ The Company elected the “package of practical expedients” permitted under the transition guidance, which among other things, does not require reassessment of whether contracts entered into prior to adoption are or contain leases, and allows carryforward of the historical lease classification for existing leases. The Company did not elect the “hindsight” practical expedient, and therefore measured the ROU assets and lease liabilities using the remaining portion of the lease term at adoption on January 1, 2022. ​ The Company made an accounting policy election not to recognize ROU assets and lease liabilities for leases with a term of twelve months or less. For all other leases, the Company recognizes ROU assets and lease liabilities based on the present value of lease payments over the lease term at the commencement date of the lease (or January 1, 2022 for existing leases upon the adoption of ASC 842). Lease payments may include fixed rent escalation clauses or payments that depend on an index (such as the consumer price index). Subsequent changes to an index and any other periodic market-rate adjustments to base rent are recorded in variable lease expense in the period incurred. The ROU assets also include any initial direct costs incurred and lease payments made at or before the commencement date and are reduced by any lease incentives. ​ The Company has made an accounting policy election to account for lease and non-lease components in its contracts as single lease components for all asset classes. The non-lease components typically represent additional services transferred to the Company, such as common area maintenance for real estate, which are variable in nature and recorded in variable lease expense in the period incurred. ​ The Company uses its incremental borrowing rate which is the rate of interest the Company would have to pay to borrow on a collateralized basis over a similar term and amount in a similar economic environment to determine the present value of lease payments as the Company’s leases do not have a readily determinable implicit discount rate. Judgment is applied in assessing factors such as Company specific credit risk, lease term, nature, and quality of the underlying collateral, currency, and economic environment in determining the incremental borrowing rate to apply to each lease. ​ Upon adoption, the Company recorded operating lease ROU assets and lease liabilities of $6.0 million and $7.0 million, respectively, the difference relating to deferred rent. The Company recorded financing lease ROU assets and lease liabilities ​ In December 2019, the FASB issued ASU 2019-12, Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes ​ Recently issued accounting pronouncements The Company qualifies as an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected not to “opt out” of the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the newer revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for nonpublic companies. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326)

Fair value of financial assets

Fair value of financial assets and liabilities	6 Months Ended
	Jun. 30, 2022
Fair value of financial assets and liabilities
Fair value of financial assets and liabilities	3. Fair value of financial assets and liabilities The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value measurements as of June 30, 2022 ​ Level 1 Level 2 Level 3 Total Assets ​ ​ ​ ​ ​ Cash equivalents ​ $ 45,132 ​ $ — ​ $ — ​ $ 45,132 Short-term investments ​ 94,371 ​ — ​ — ​ 94,371 Long-term investments ​ ​ 22,816 ​ ​ — ​ ​ — ​ ​ 22,816 ​ ​ $ 162,319 ​ $ — ​ $ — ​ $ 162,319 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value measurements at December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets ​ ​ ​ ​ ​ Cash equivalents ​ $ 173,755 ​ $ — ​ $ — ​ $ 173,755 Short-term investments ​ ​ 15,110 ​ ​ — ​ ​ — ​ ​ 15,110 Long-term investments ​ 9,966 ​ — ​ — ​ 9,966 ​ ​ $ 198,831 ​ $ — ​ $ — ​ $ 198,831 ​ During the three and six months ended June 30, 2022 and 2021, respectively, there were no transfers between Level 1, Level 2 and Level 3. Valuation of short-term and long-term investments Short-term and long-term investments, which consisted of U.S. Treasury bonds and notes and certificates of deposit were valued by the Company using quoted prices in active markets for similar securities, which represents a Level 1 measurement within the fair value hierarchy.

Investments

Investments	6 Months Ended
	Jun. 30, 2022
Investments
Investments	4. Investments Short-term and long-term investments by investment type consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ Amortized unrealized unrealized Fair ​ cost gains losses value Short-term investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Government Treasury Bills ​ $ 47,371 ​ $ — ​ $ (137) ​ $ 47,234 U.S. Government Treasury Notes ​ ​ 47,595 ​ ​ — ​ ​ (458) ​ ​ 47,137 ​ ​ $ 94,966 ​ $ — ​ $ (595) ​ $ 94,371 Long-term Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of Deposit ​ ​ 1,169 ​ ​ — ​ ​ (5) ​ ​ 1,164 U.S. Government Treasury Notes - Maturity One - Two Years ​ ​ 21,971 ​ ​ 16 ​ ​ (335) ​ ​ 21,652 ​ ​ $ 23,140 ​ $ 16 ​ $ (340) ​ $ 22,816 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ Amortized unrealized unrealized Fair Short-term investments cost gains losses value U.S. Government Treasury Bills ​ $ 4,983 ​ $ — ​ $ (2) ​ $ 4,981 U.S. Government Treasury Notes ​ ​ 10,142 ​ ​ — ​ ​ (13) ​ ​ 10,129 ​ ​ $ 15,125 ​ $ — ​ $ (15) ​ $ 15,110 Long-term Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Government Treasury Notes - Maturity One - Five Years ​ $ 9,966 ​ $ — ​ $ — ​ $ 9,966 ​ ​ $ 9,966 ​ $ — ​ $ — ​ $ 9,966 ​

Inventory

Inventory	6 Months Ended
	Jun. 30, 2022
Inventory
Inventory	5. Inventory Inventory consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Raw materials ​ $ 12,559 ​ $ 10,135 Work in process ​ 722 ​ 1,235 Finished goods ​ 8,012 ​ 4,301 Total ​ $ 21,293 ​ $ 15,671 ​ Raw materials, work in process and finished goods were net of adjustments to net realizable value of $0.6 million and $1.2 million as of June 30, 2022 and December 31, 2021, respectively.

Prepaid expenses and other curr

Prepaid expenses and other current assets	6 Months Ended
	Jun. 30, 2022
Prepaid expenses and other current assets
Prepaid expenses and other current assets	6. Prepaid expenses and other current assets Prepaid expenses and other current assets consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Prepaid insurance ​ $ 131 ​ $ 1,622 Contract asset ​ 123 ​ 396 Deposits ​ 1,009 ​ 1,262 Lease receivables, current portion ​ 103 ​ 231 Other ​ 633 ​ 440 ​ ​ $ 1,999 ​ $ 3,951 ​

Property and equipment, net

Property and equipment, net	6 Months Ended
	Jun. 30, 2022
Property and equipment, net
Property and equipment, net	7. Property and equipment, net Property and equipment, net consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Manufacturing and laboratory equipment ​ $ 11,737 ​ $ 13,277 Computer hardware and software ​ 1,553 ​ 1,742 Office furniture and fixtures ​ 580 ​ 745 Leasehold improvements ​ ​ 8,243 ​ ​ 3,012 Construction-in-process ​ 1,001 ​ 4,313 ​ ​ 23,114 ​ 23,089 Less: Accumulated depreciation ​ (10,465) ​ (11,785) ​ ​ $ 12,649 ​ $ 11,304 ​

Accrued expenses and other curr

Accrued expenses and other current liabilities	6 Months Ended
	Jun. 30, 2022
Accrued expenses and other current liabilities
Accrued expenses and other current liabilities	8. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Accrued employee compensation and benefits expense ​ $ 2,321 ​ $ 3,569 Accrued vendor expenses ​ 1,588 ​ 5,500 Accrued warranty expense ​ 935 ​ 598 Deferred rent, current portion ​ — ​ 131 Accrued taxes ​ 237 ​ 781 Other ​ 200 ​ 338 ​ ​ $ 5,281 ​ $ 10,917 ​

Long-term debt

Long-term debt	6 Months Ended
	Jun. 30, 2022
Long-term debt
Long-term debt	9. Long-term debt There was no long-term debt outstanding as of June 30, 2022 or December 31, 2021. Term loan agreements 2020 Term Loan In May 2020, the Company entered into a $60.0 million term loan facility with a new lender (the “2020 Term Loan”), which provides for borrowings of an initial $25.0 million tranche upon closing and options to borrow up to an aggregate of $35.0 million in two additional tranches of $20.0 million under the second tranche (the “Term B Loan”) and $15.0 million under the third tranche (the “Term C Loan”). At closing, the Company issued warrants to purchase 1,195,652 shares of Series C1 Preferred Stock to the lender with an exercise price of $1.15 per share which were accounted for as debt discount. The Company paid a $0.8 million facility fee in connection with the term loan facility. The Company allocated the $0.8 million term loan facility fee to the three loan tranches on a pro-rata basis based on the amount available to be drawn down under each tranche. The Company allocated $0.3 million to the initial draw which was recorded within debt issuance cost as an offset to the carrying value of the 2020 Term Loan and amortized over the term of the loan within interest expense on the condensed consolidated statement of operations. Additionally, the Company allocated $0.3 million to the Term B Loan and $0.2 million to the Term C Loan, all of which was recorded within prepaid expenses and other current assets on the consolidated balance sheet and is being amortized on a straight-line basis over the debt access period within interest expense on the consolidated statement of operations. The Company incurred debt issuance costs of $1.5 million in connection with the 2020 Term Loan including $0.9 million of professional fees and $0.6 million for the fair value of the warrants issued with the debt. Interest expense on the 2020 Term Loan totaled $0.9 million and $1.8 million for three and six months ended June 30, 2021, respectively, which included amortization of the debt discount of $0.1 million and $0.3 million for the three and six months ended June 30, 2021, respectively. In September 2021, the Company repaid the 2020 Term Loan and incurred a debt extinguishment loss of $3.1 million, which was comprised of a $1.8 million prepayment penalty, $1.1 million expense related to unamortized discounts, and $0.2 million in unamortized prepaid facility fees and other charges.

Redeemable convertible preferre

Redeemable convertible preferred stock	6 Months Ended
	Jun. 30, 2022
Redeemable convertible preferred stock.
Redeemable convertible preferred stock	10. Redeemable convertible preferred stock The Company has historically issued Series A1 redeemable convertible preferred stock (the “Series A1 Preferred Stock”), Series B1 redeemable convertible preferred stock (the “Series B1 Preferred Stock”), Series C1 redeemable convertible preferred stock (the “Series C1 Preferred Stock”), Series C2 redeemable convertible preferred stock (the “Series C2 Preferred Stock”), Series D1 redeemable convertible preferred stock (the “Series D1 Preferred Stock”) and Series D2 redeemable convertible preferred stock (the “Series D2 Preferred Stock”). The Series A1 Preferred Stock, Series B1 Preferred Stock, Series C1 Preferred Stock, Series C2 Preferred Stock, Series D1 Preferred Stock, and Series D2 Preferred Stock are collectively referred to as the “Preferred Stock”. In March 2021, the Company issued and sold 22,086,725 shares of Series D1 Preferred Stock and 413,268 shares of Series D2 Preferred Stock to new and existing investors at a price of $3.60 per share for gross proceeds of $79.5 million and $1.5 million, respectively. The Company incurred issuance costs in connection with this transaction of $1.3 million and recorded them as a reduction to the carrying value of the Series D1 Preferred Stock and Series D2 Preferred Stock. On June 25, 2021, investors exchanged a total of 11,437,301 shares and 2,364,509 shares of Series C1 and D1 Preferred Stock to an equal number of shares of Series C2 and D2 Preferred Stock, respectively. On July 14, 2021, the IPO resulted in the automatic conversion of all Series A1, Series B1, Series C1 and Series D1 preferred stock into 24,200,920 shares of Class A common stock and of all Series C2 and Series D2 preferred stock into 6,903,379 shares of Class B common stock. On July 19, 2021, the Company restated its certificate of incorporation and authorized 10,000,000 shares of $0.01 par value Preferred Stock. ​

Preferred stock warrants

Preferred stock warrants	6 Months Ended
	Jun. 30, 2022
Preferred stock warrants
Preferred stock warrants	11. In connection with the 2020 Term Loan, the Company issued 1,195,652 warrants to purchase shares of Series C1 Preferred Stock at an exercise price of $1.15 per share. The Company’s warrants were immediately exercisable and expire 10 years after issuance. The fair value of the warrants on the issuance date was $0.7 million. The Company also had outstanding warrants to purchase shares of Preferred Stock issued in connection with previous financing agreements. In connection with the IPO, all of the Company’s outstanding preferred stock warrants were automatically converted to Class A common stock warrants. The Company determined the conversion to Class A common stock warrants resulted in equity classification of the Class A common stock warrants and reclassified the fair value of the preferred stock warrant liability as of the IPO date into stockholders’ equity (see Note 12). The warrant liability was related to the warrants to purchase shares of the Company’s Series A1, B1, and C1 redeemable convertible preferred stock (see Note 10). The fair value of the warrant liability was determined based on inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The Company used the Black-Scholes option-pricing model, which incorporates assumptions and estimates, to value the warrant liability. Key estimates and assumptions impacting the fair value measurement include (i) the fair value per share of the underlying shares of applicable series of redeemable convertible preferred stock issuable upon exercise of the warrants, (ii) the remaining contractual term of the warrants, (iii) the risk-free interest rate, (iv) the expected dividend yield and (v) expected volatility of the price of the underlying applicable series of redeemable convertible preferred stock. The Company estimated the fair value per share of the underlying applicable series of redeemable convertible preferred stock based, in part, on the results of third-party valuations and additional factors deemed relevant. The risk-free interest rate was determined by reference to the U.S. Treasury yield curve for time periods approximately equal to the remaining contractual term of the warrant. The Company estimated a zero expected dividend yield based on the fact that the Company has never paid or declared dividends and does not intend to do so in the foreseeable future. As the Company has historically been a private company and lacks company-specific historical and implied volatility information of its stock, the expected stock volatility was based on the historical volatility of publicly traded peer companies for a term equal to the remaining contractual term of the warrant. The table below quantifies the weighted average of the unobservable inputs used to fair value the preferred stock warrant liability as of June 30, 2021, prior to their conversion into common stock warrants: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ ​ 2021 2021 ​ Fair value of Series A1 preferred stock ​ $ 2.51 ​ ​ $ 2.52 ​ Fair value of Series B1 preferred stock ​ $ 2.88 ​ ​ $ 2.89 ​ Fair value of Series C1 preferred stock ​ $ 2.95 ​ ​ $ 2.96 ​ Remaining contractual term (in years) ​ 6.7 ​ ​ 6.8 ​ Risk-free interest rate ​ 1.1 % ​ 1.2 % Expected dividend yield ​ — % ​ — % Expected volatility ​ 42.2 % ​ 41.9 % ​ The following table provides a rollforward of the aggregate fair values of the Company’s preferred stock warrant liability, prior to their conversion into common stock warrants, for which fair values are determined using Level 3 inputs (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2021 2021 Balance, beginning of period ​ $ 15,565 ​ $ 4,117 Change in fair value ​ 35 ​ 11,483 Balance, end of period ​ $ 15,600 ​ $ 15,600 ​ There were no outstanding preferred stock warrants as of June 30, 2022 or December 31, 2021.

Common stock and common stock w

Common stock and common stock warrants	6 Months Ended
	Jun. 30, 2022
Common stock and common stock warrants
Common stock and common stock warrants	12. As of June 30, 2022 and December 31, 2021, the Company’s restated certificate of incorporation authorized the issuance of 210,000,000 shares of $0.01 par value Class A common stock. On June 25, 2021, the Company filed an amended and restated certificate of incorporation, which effected a recapitalization of the Company’s then outstanding common stock to Class A common stock and authorized an additional new class of common stock (Class B common stock). Rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. On July 19, 2021, the Company filed an amended and restated certificate of incorporation which authorized Class A common stock and Class B common stock to 210,000,000 shares and 10,000,000 shares, respectively. As of June 30, 2022, there were outstanding outstanding Each share of Class A common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. The Company’s Class B common stock is non-voting. Class A and Class B common stockholders are entitled to receive dividends, as may be declared by the board of directors, if any, subject to the preferential dividend rights of Preferred Stock. As of June 30, 2022, no cash dividends had been declared or paid. As of June 30, 2022, the Company had reserved 20,268,510 shares of common stock for the exercise of outstanding stock options, vesting of restricted stock units, the number of shares remaining available for grant under the Company’s 2021 Incentive Award Plan (see Note 13), the number of shares available for purchase under the Company’s Employee Stock Purchase Plan (see Note 13), shares of common stock for the exercise of outstanding common stock warrants and the conversion of Class B common stock. In prior years the Company issued warrants to purchase common stock in conjunction with previous financing arrangements. In connection with the IPO, all outstanding preferred stock warrants were automatically converted to Class A common stock warrants. The contractual terms of the converted Class A common stock warrants remained consistent with the original terms of the preferred stock warrants. The Company determined the event resulted in equity classification of the Class A common stock warrants and reclassified the fair value of the preferred stock warrant liability as of the IPO date into equity. As of June 30, 2022, outstanding warrants to purchase common stock consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ ​ ​ ​ Shares of ​ ​ ​ ​ ​ ​ ​ ​ common stock ​ ​ ​ ​ ​ ​ ​ Balance sheet ​ issuable upon ​ Weighted average Issuance date Contractual term classification exercise of warrant exercise price ​ ​ (in years) ​ ​ ​ ​ ​ ​ ​ July 24, 2017 ​ 10 ​ Equity ​ 17,194 ​ $ 292.81 April 12, 2018 ​ 10 ​ Equity ​ 30,000 ​ $ 1.00 July 14, 2021 ​ 10 ​ Equity ​ 975,109 ​ $ 1.46 ​ ​ ​ ​ ​ ​ 1,022,303 ​ ​ ​ ​ As of December 31, 2021, outstanding warrants to purchase common stock outstanding consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ Shares of ​ ​ ​ ​ ​ ​ ​ ​ common stock ​ ​ ​ ​ ​ ​ ​ Balance sheet ​ issuable upon ​ Weighted average Issuance date Contractual term classification exercise of warrant exercise price ​ ​ (in years) ​ ​ ​ ​ ​ ​ ​ July 24, 2017 ​ 10 ​ Equity ​ 25,835 ​ $ 295.15 April 12, 2018 ​ 10 ​ Equity ​ 30,000 ​ $ 1.00 July 14, 2021 ​ 10 ​ Equity ​ 975,109 ​ $ 1.46 ​ ​ ​ ​ ​ ​ 1,030,944 ​ ​ ​ ​

Stock-based compensation

Stock-based compensation	6 Months Ended
	Jun. 30, 2022
Stock-based compensation
Stock-based compensation	13. Stock-based compensation 2010 Stock Option and Grant Plan In March 2021, the Board of Directors approved an increase to the 2010 Plan shares by 382,889 shares. Following the effectiveness of the IPO, no additional awards are being granted under the 2010 Plan and shares of existing outstanding options that are forfeited or canceled will be available for grant under the 2021 Incentive Award Plan. 2021 Incentive Award Plan In July 2021, the Board of Directors adopted, and the Company’s stockholders approved, the 2021 Incentive Award Plan (the “2021 Plan”), which became effective in connection with the IPO of Class A common stock. The 2021 Plan provides for the grant of stock options, including incentive stock options and non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, and other stock-based and cash-based awards. The 2021 Plan has a term of . The aggregate number of shares of Class A common stock available for issuance under the 2021 Plan is equal to (i) determined by the Board of Directors. No more than 33,900,000 shares of Class A common stock may be issued under the 2021 Plan upon the exercise of incentive stock options. As of June 30, 2022, there are 3,593,599 shares available for issuance under the 2021 Plan. The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted to employees and directors: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ 2022 2021 ​ 2022 2021 Risk-free interest rate 2.85 % 1.1 % ​ 2.00 % 1.0 % Expected term (in years) 5.9 6.1 ​ ​ 6.0 6.0 ​ Expected volatility 43.9 % 43.1 % ​ 43.1 % 44.3 % Expected dividend yield 0 % 0 % ​ 0 % 0 % ​ Stock options The following table summarizes the Company’s stock option activity since December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ Number of ​ average ​ remaining ​ Aggregate ​ shares exercise price contractual term intrinsic value ​ ​ ​ ​ ​ ​ ​ (in years) ​ ​ (in thousands) Outstanding as of December 31, 2021 4,823,100 ​ $ 5.06 7.62 ​ $ 31,041 Granted 1,542,759 ​ 7.53 ​ ​ ​ ​ ​ Exercised (475,033) ​ 0.99 ​ ​ ​ ​ ​ Expired (5,546) ​ 10.74 ​ ​ ​ ​ ​ Forfeited (212,152) ​ 11.85 ​ ​ ​ ​ ​ Outstanding as of June 30, 2022 5,673,128 ​ $ 5.79 ​ 8.15 ​ $ 9,010 Options vested and expected to vest as of June 30, 2022 5,673,128 ​ $ 5.79 ​ 8.15 ​ $ 9,010 Options exercisable as of June 30, 2022 2,426,101 ​ $ 2.72 ​ 6.78 ​ $ 6,687 ​ The aggregate intrinsic value of options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s Class A common stock for those options that had exercise prices lower than such fair value. The intrinsic value of stock options exercised during the six months ended June 30, 2022 and 2021 was $2.8 million and $0.3 million, respectively. The weighted average grant-date fair value per share of stock options granted during the three months ended June 30, 2022 and 2021 was $2.40 and $1.03, respectively, and during the six months ended June 30, 2022 and 2021 was $3.30 and $0.80, respectively. Restricted stock In February 2021, the Company granted 248,903 shares of restricted stock to an employee under the 2010 Plan with a four-year vesting term. In connection with the grant, the employee paid $0.5 million, which represents the $2.10 per share fair value of the common stock on the date of the restricted stock grant. The restricted common stock includes a repurchase right, whereas upon the occurrence of the employee’s resignation or termination for cause or good reason the Company shall have the right to repurchase unvested restricted common stock shares. At June 30, 2022 and December 31, 2021, the Company had $0.3 million and $0.5 million in unvested restricted common stock liability included in other long-term liabilities, respectively. The following table summarizes the Company’s restricted stock activity since December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number of ​ average ​ shares fair value ​ ​ ​ ​ ​ Unvested as of December 31, 2021 ​ 248,903 ​ $ 2.10 Granted ​ - ​ ​ - Vested ​ (82,967) ​ $ 2.10 Forfeited ​ - ​ ​ - Unvested as of June 30, 2022 ​ 165,936 ​ $ 2.10 ​ Restricted stock units Restricted stock unit grants to employees have a three-year vesting term. The Company expenses the fair value of the restricted stock units over the vesting period and accounts for forfeitures prospectively as they occur. The following table summarizes restricted stock units granted to Company employees during the six months ended June 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number of ​ average ​ shares fair value ​ ​ ​ ​ ​ Unvested as of December 31, 2021 ​ - ​ $ - Granted ​ 593,480 ​ ​ 7.62 Vested ​ - ​ ​ - Forfeited ​ (9,600) ​ ​ 7.58 Unvested as of June 30, 2022 ​ 583,880 ​ $ 7.62 ​ The weighted average grant-date fair value per share of restricted stock units granted during the three and six months ended June 30, 2022 was $5.00 and $7.62, respectively. There were no restricted stock units granted during the six months ended June 30, 2021. ​ 2021 Employee Stock Purchase Plan In July 2021, the Board of Directors adopted, and the Company’s stockholders approved, the 2021 Employee Stock Purchase Plan (the “2021 ESPP”), which became effective in connection with the IPO of Class A common stock. The aggregate number of shares of Class A common stock available for issuance under the 2021 ESPP is equal to (i) 400,000 shares and (ii) an annual increase for ten years on the first day of each calendar year beginning on January 1, 2022, equal to the lesser of (A) 1% of the aggregate number of shares of Class A common stock outstanding on the last day of the immediately preceding calendar year and (B) such smaller amount of shares as determined by the Board of Directors. No more than 6,300,000 shares of Class A common stock may be issued under the 2021 ESPP. Under the 2021 ESPP, eligible employees may purchase shares of the Company’s common stock through payroll deductions of up to 15% of eligible compensation during an offering period. Generally, each offering period will be for 6 months as determined by the Company's board of directors. In no event may an employee purchase more than 100,000 shares per offering period based on the closing price on the first trading date of an offering period or the last trading date of an offering period, or more than $25,000 worth of stock during any calendar year. The purchase price for shares to be purchased under the 2021 ESPP is 85% of the lesser of the market price of the Company's common stock on the first trading date of an offering period or on any purchase date during an offering period (March 14 or September 14). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ ​ ​ 2022 ​ 2022 ​ Risk-free interest rate ​ ​ 0.86 % ​ 0.86 % Expected term (in years) ​ 0.5 0.5 Expected volatility ​ 43.1 % 43.1 % Expected dividend yield ​ 0 % 0 % ​ Stock-based compensation Stock-based compensation expense was classified in the condensed consolidated statements of operations as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Cost of revenue ​ $ 164 ​ $ 85 ​ $ 264 ​ $ 115 Research and development ​ 100 ​ 37 ​ 179 ​ 49 Sales and marketing ​ 142 ​ 60 ​ 276 ​ 82 General and administrative ​ 852 ​ 208 ​ 1,522 ​ 335 Total stock-based compensation expense ​ $ 1,258 ​ $ 390 ​ $ 2,241 ​ $ 581 ​ As of June 30, 2022, total unrecognized compensation expense related to unvested stock options held by employees and directors was $10.8 million, which is expected to be recognized over a weighted average period of 2.9 years. Additionally, unrecognized compensation expense related to unvested restricted stock units held by employees and directors was $3.9 million, which is expected to be recognized over a weighted average period of 2.7 years.

Income taxes

Income taxes	6 Months Ended
	Jun. 30, 2022
Income taxes
Income taxes	14. Income taxes During the three and six months ended June 30, 2022 and 2021, the pretax losses incurred by the Company, as well as the research and development tax credits generated, received no corresponding tax benefit because the Company concluded that it is more likely than not that the Company will be unable to realize the value of any resulting deferred tax assets. The Company will continue to assess its position in future periods to determine if it is appropriate to reduce a portion of its valuation allowance in the future. The Company’s tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate, adjusted for the effect of discrete items arising in that quarter. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter. The Company has evaluated the positive and negative evidence bearing upon its ability to realize its deferred tax assets, which primarily consist of net operating loss carryforwards. The Company has considered its history of cumulative net losses, estimated future taxable income and prudent and feasible tax planning strategies and has concluded that it is more likely than not that the Company will not realize the benefits of its deferred tax assets. As a result, as of June 30, 2022 and December 31, 2021 the Company has recorded a full valuation allowance against its net deferred tax assets. The Company files U.S. income tax returns as prescribed by the tax laws of the jurisdictions in which it operates. In the normal course of business, the Company is subject to examination by federal and state jurisdictions, where applicable. There are currently no pending tax examinations in the U.S. The Company has not received notice of examination by any jurisdictions in the U.S. The Company has a branch in Germany that was under examination in its local country for tax years 2016 through 2018. The Company adjusted the uncertain tax position as a result of the outcome of the tax examination for our German entity, resulting in an income tax benefit of $0.6 million for each of the three and six months ended June 30, 2022.

Net loss per share

Net loss per share	6 Months Ended
	Jun. 30, 2022
Net loss per share
Net loss per share	15. Net loss per share As of June 30, 2022, the Company has Class A common stock and Class B common stock. According to the Company’s restated certificate of incorporation, both classes have the same rights to the Company’s earnings and neither of the shares have any prior or senior rights to dividends to other shares. The Company reported a net loss attributable to common stockholders for the three and six months ended June 30, 2022 and 2021, as such basic net loss per share attributable to common stockholders was the same as diluted net loss per share attributable to common stockholders. Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Net loss ​ $ (13,090) ​ $ (11,831) ​ $ (28,020) ​ $ (33,932) Accretion of redeemable convertible preferred stock to redemption value ​ — ​ (1,184) ​ — ​ (1,971) Cumulative redeemable convertible preferred stock dividends ​ — ​ (885) ​ — ​ (2,296) Net loss attributable to common stockholders—basic and diluted ​ $ (13,090) ​ $ (13,900) ​ $ (28,020) ​ $ (38,199) Denominator: ​ ​ ​ ​ Weighted average Class A common shares outstanding—basic and diluted ​ ​ 36,940,676 ​ ​ 694,698 ​ ​ 36,443,792 ​ ​ 668,180 Weighted average Class B common shares outstanding—basic and diluted ​ ​ 5,553,379 ​ ​ — ​ ​ 5,902,815 ​ ​ — Total shares for EPS—basic and diluted ​ ​ 42,494,055 ​ ​ 694,698 ​ ​ 42,346,607 ​ ​ 668,180 Net loss per share attributable to Class A common stockholders—basic and diluted ​ $ (0.31) ​ $ (20.01) ​ $ (0.66) ​ $ (57.17) Net loss per share attributable to Class B common stockholders—basic and diluted ​ $ (0.31) ​ $ — ​ $ (0.66) ​ $ — ​ The Company’s potentially dilutive securities, which include stock options, restricted stock, redeemable convertible preferred stock, common stock warrants and preferred stock warrants, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect: ​ ​ ​ ​ ​ ​ ​ Three and Six Months Ended June 30, ​ 2022 2021 Options to purchase common stock 5,673,128 4,512,084 Unvested restricted common stock ​ 749,816 ​ — Warrants to purchase common stock 286,324 55,835 Options to purchase common stock under ESPP ​ 46,477 ​ — Redeemable convertible preferred stock (as converted to common stock) — 31,104,299 Warrants to purchase preferred stock (as converted to warrants to purchase common stock) — 1,243,834 ​ 6,755,745 36,916,052 ​

Leases

Leases	6 Months Ended
	Jun. 30, 2022
Leases
Leases	16. Leases The Company adopted Topic 842 on January 1, 2022 using the optional transition method to the modified retrospective approach. The impact of the adoption of Topic 842 to the Company's applicable balance sheet items as of January 1, 2022 is presented in the table below (in thousands). The standard did not have a material impact to the Company's unaudited condensed consolidated statements of operations, comprehensive loss, or cash flows. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As Reported ​ Adjustments ​ Adjusted ​ December 31, 2021 ASC 842 Adoption January 1, 2022 Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Right-of-use assets, net, operating ​ $ — ​ $ 6,039 ​ $ 6,039 Right-of-use assets, net, financing ​ ​ — ​ ​ 366 ​ ​ 366 Property and equipment, net ​ ​ 11,304 ​ ​ (351) ​ ​ 10,953 Total assets ​ $ 11,304 ​ $ 6,054 ​ $ 17,358 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders' Equity ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease liabilities, short-term, operating ​ $ — ​ $ 1,023 ​ $ 1,023 Lease liabilities, short-term, financing ​ ​ — ​ ​ 33 ​ ​ 33 Accrued expenses ​ ​ 10,917 ​ ​ (160) ​ ​ 10,757 Total current liabilities ​ $ 18,166 ​ $ 896 ​ $ 19,062 Lease liabilities, long-term, operating ​ ​ — ​ ​ 5,960 ​ ​ 5,960 Lease liabilities, long-term, financing ​ ​ — ​ ​ 341 ​ ​ 341 Deferred rent, long-term ​ ​ 813 ​ ​ (813) ​ ​ — Other long-term liabilities ​ ​ 1,210 ​ ​ (330) ​ ​ 880 Total liabilities ​ $ 20,189 ​ $ 6,054 ​ $ 26,243 Total stockholders' equity ​ $ 220,980 ​ $ — ​ $ 220,980 Total liabilities and stockholders' equity ​ $ 241,169 ​ $ 6,054 ​ $ 247,223 ​ The Company determines if an arrangement is or contains a lease at inception, which is the date on which the terms of the contract are agreed to, and the agreement creates enforceable rights and obligations. Under ASC 842, a contract is or contains a lease when (i) explicitly or implicitly identified assets have been deployed in the contract and (ii) the customer obtains substantially all of the economic benefits from the use of that underlying asset and directs how and for what purpose the asset is used during the term of the contract. The Company also considers whether its service arrangements include the right to control the use of an asset. See Note 2 for more information on the Company’s accounting policies for leases. The Company leases office and manufacturing space under operating lease agreements that have initial terms ranging from approximately 8 to 10 years. The Company leases furniture under a financing lease agreement that has an initial term of approximately 8 years. Some leases include one or more options to renew, generally at our sole discretion, with renewal terms that can extend the lease term up to 5 years. In addition, certain leases contain termination options, where the rights to terminate are held by either the Company, the lessor, or both parties. Options to extend a lease are included in the lease term when it is reasonably certain that the Company will exercise the option. Options to terminate a lease are excluded from the lease term when it is reasonably certain that the Company will not exercise the option. The Company’s leases generally do not contain any material restrictive covenants or residual value guarantees. Supplemental cash flow information related to leases is as follows (in thousands): ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2022 ​ ​ ​ ​ Cash paid for amounts included in measurement of lease liabilities: ​ ​ ​ Operating cash outflows - payments on operating leases ​ $ 583 Operating cash outflows - payments on financing leases ​ $ 21 Financing cash outflows - payments on financing leases ​ $ 16 Right-of-use assets obtained in exchange for new lease obligations: ​ ​ ​ Operating leases ​ $ 7,605 Financing leases ​ $ 366 ​ Supplemental balance sheet information related to the Company’s operating and financing leases is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ Operating Leases: ​ ​ ​ ​ Operating lease assets ​ $ 7,189 ​ ​ ​ ​ ​ ​ Accrued expenses and other current liabilities ​ $ 694 ​ Operating lease liabilities ​ ​ 7,405 ​ Total operating lease liabilities ​ $ 8,099 ​ ​ ​ ​ ​ ​ Financing Leases: ​ ​ ​ ​ Office furniture and fixtures ​ $ 386 ​ Accumulated depreciation ​ ​ (45) ​ Net property, plant and equipment ​ $ 341 ​ ​ ​ ​ ​ ​ Current portion of long-term debt ​ $ 35 ​ Long-term debt ​ ​ 322 ​ Total financing lease liabilities ​ $ 357 ​ ​ ​ ​ ​ ​ Weighted-average remaining lease term - operating leases: ​ ​ 7.04 ​ Weighted-average remaining lease term - financing leases: ​ ​ 7.00 ​ Weighted-average discount rate - operating leases: ​ ​ 3.7 % Weighted-average discount rate - financing leases: ​ ​ 12.0 % ​ The components of lease expense were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2022 ​ ​ Six Months Ended June 30, 2022 Operating lease cost ​ $ 288 ​ ​ $ 549 Financing lease cost - amortization of right-of-use asset ​ ​ 12 ​ ​ ​ 24 Financing lease cost - interest on lease liability ​ ​ 11 ​ ​ ​ 21 Short-term lease cost ​ ​ 15 ​ ​ ​ 31 Variable lease cost ​ ​ 150 ​ ​ ​ 316 Total lease cost ​ $ 476 ​ ​ $ 941 ​ Operating lease cost is recognized on a straight-line basis over the lease term. Total rent expense, including the Company’s share of the lessors’ operating expenses, was million, respectively, for the three and six months ended June 30, 2022. Financing lease cost includes asset amortization on a straight-line basis over the lease term and interest accretion calculated using the effective interest method. Total financing lease asset depreciation and interest expense was less than In March 2022, the Company amended the lease for its office and manufacturing space in Lowell, Massachusetts (the “Amendment”). The Amendment increased the amount of facility space subject to the lease and extended the expiration of the lease from July 2026 to July 2029. The terms of the Amendment include options for a one-time, five-year extension of the lease and early termination of the lease in July 2026 (subject to an early termination fee), as well as a $0.3 million tenant improvement allowance. Monthly rent payments are fixed and future minimum lease payments under the lease (as amended) are $4.6 million. Included in the $4.6 million are leases with commencement dates expected later in 2022 and therefore are not recorded on the consolidated balance sheets as of June 30, 2022. The future minimum lease payments related to these leases are approximately $0.9 million. The Amendment qualified as a lease modification and resulted in a right of use asset and lease liability in the amount of $1.2 million and $1.3 million, respectively, recognized in March 2022, and an additional right of use asset and lease liability Maturities of the Company’s operating lease liabilities as of June 30, 2022 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Operating Leases 2022 (excluding the six months ended June 30) ​ $ 624 2023 ​ ​ 1,273 2024 ​ ​ 1,306 2025 ​ ​ 1,339 2026 ​ ​ 1,372 Thereafter ​ ​ 3,627 Total lease payments ​ $ 9,541 Less imputed interest ​ ​ (1,171) Total present value of lease liabilities ​ $ 8,370 ​ Maturities of the Company’s financing lease liability as of June 30, 2022 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Financing Leases 2022 (excluding the six months ended June 30) ​ $ 38 2023 ​ ​ 75 2024 ​ ​ 75 2025 ​ ​ 75 2026 ​ ​ 75 Thereafter ​ ​ 187 Total lease payments ​ $ 525 Less imputed interest ​ ​ (168) Total present value of lease liabilities ​ $ 357 ​ Maturities of the Company’s operating lease liabilities as of December 31, 2021 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2021 2022 ​ $ 1,139 2023 ​ ​ 1,169 2024 ​ ​ 1,199 2025 ​ ​ 1,229 2026 ​ ​ 1,044 Thereafter ​ ​ 1,953 Total minimum lease commitments ​ $ 7,733 ​

Commitments and contingencies

Commitments and contingencies	6 Months Ended
	Jun. 30, 2022
Commitments and contingencies
Commitments and contingencies	17. Commitments and contingencies Supply agreement Software subscription During the year ended December 31, 2021, the Company entered into a non-cancelable agreement with a service provider for software as a service and cloud hosting services. As of June 30, 2022, the Company had committed to minimum payments under this arrangement totaling $0.8 million through January 31, 2026. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. The Company had zero and $0.1 million accrued for the software subscription as of June 30, 2022 and December 31, 2021, respectively. Indemnification agreements In the ordinary course of business, the Company may provide indemnification of varying scope and terms to customers, vendors, lessors, business partners and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and certain of its executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not currently aware of any indemnification claims and has not accrued any liabilities related to such obligations in its condensed consolidated financial statements as of June 30, 2022 and December 31, 2021. Legal proceedings The Company is not a party to any litigation and does not have contingency reserves established for any litigation liabilities. At each reporting date, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies. The Company expenses as incurred the costs related to legal proceedings.

Benefit plans

Benefit plans	6 Months Ended
	Jun. 30, 2022
Benefit plans
Benefit plans	18. Benefit plans The Company established a defined contribution savings plan under Section 401(k) of the Code. This plan covers all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Matching contributions to the plan may be made at the discretion of the Company’s board of directors. The Company made contributions of $0.2 million and $0.1 million to the plan during the three months ended June 30, 2022 and 2021, respectively, and made contributions of $0.5 million and $0.1 million to the plan during the six months ended June 30, 2022 and 2021, respectively.

Subsequent events

Subsequent events	6 Months Ended
	Jun. 30, 2022
Subsequent events.
Subsequent events	19. Subsequent events On August 11, 2022, the board of directors of the Company approved an organizational restructuring plan (the “Restructuring Plan”) to right-size its cost structure based on its lowered 2022 outlook. The Company will continue to invest in key growth initiatives including enhancing commercial execution and key product development programs that are expected to drive future revenue growth. The Restructuring Plan involves an approximately reduction in the Company’s workforce, including employees, contractors and temporary employees, which is largely focused on non-commercial functions. The Company expects to record a restructuring charge of approximately

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	6 Months Ended
	Jun. 30, 2022
Summary of significant accounting policies
Use of estimates	Use of estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, calculating the standalone selling price for revenue recognition, the valuation of inventory, the valuation of common stock and stock-based awards, and the valuation of the preferred stock warrant liability. The Company bases its estimates on historical experience, known trends and other market-specific and relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates. Due to the COVID-19 pandemic, there has been uncertainty and disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities. These estimates may change as new events occur and additional information is obtained. Other than policies noted below, there have been no significant changes to the significant accounting policies during the three and six months ended June 30, 2022, as compared to the significant accounting policies disclosed in Note 2 of the audited consolidated financial statements as of December 31, 2021 filed with the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021.
Risk of concentrations of credit, significant customers and significant suppliers	Risk of concentrations of credit, significant customers and significant suppliers Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term and long-term investments and accounts receivable. Periodically, the Company maintains deposits in accredited financial institutions in excess of federally insured limits. The Company maintains its cash and cash equivalents and investments with financial institutions that management believes to be of high credit quality. The Company has not experienced any other-than-temporary losses with respect to its cash equivalents and investments and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. Significant customers are those which represent more than 10% of the Company’s total revenue or accounts receivable balance at each respective balance sheet date. The following table presents customers that represent 10% or more of the Company’s total revenue: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ 2022 2021 2022 2021 Customer A 28.3 % * ​ 21.7 % * ​ Customer B ​ 15.0 % * ​ ​ * ​ * ​ Customer C ​ 14.0 % * ​ ​ * ​ * ​ Customer D ​ * ​ * ​ ​ * ​ 13.7 % Customer E * ​ 15.9 % * ​ * ​ ​ 57.3 % 15.9 % 21.7 % 13.7 % * – less than 10% The following table presents customers that represent 10% or more of the Company’s accounts receivable: ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ 2022 2021 Customer A ​ 20.4 % 19.5 % Customer B ​ 15.9 % 12.6 % Customer C 14.1 % * ​ Customer F ​ 12.7 % * ​ Customer G ​ * ​ 10.6 % Customer H * ​ 10.0 % ​ 63.1 % 52.7 % * – less than 10%
Debt issuance costs	Debt issuance costs The Company capitalizes certain legal and other third-party fees that are directly associated with the issuance of debt as debt issuance costs. Debt issuance costs are recorded as a direct reduction of the carrying amount of the associated debt on the condensed consolidated balance sheets and amortized as interest expense on the condensed consolidated statements of operations using the effective interest method, which approximates the straight-line method. As of June 30, 2022 and December 31, 2021, the Company had no debt issuance costs on its condensed consolidated balance sheets. During the three months ended June 30, 2022 and 2021, the Company recorded zero and $0.1 million, respectively, and during the six months ended June 30, 2022 and 2021, the Company recorded zero and $0.2 million, respectively, of interest expense related to amortization of debt issuance costs in the condensed consolidated statements of operations.
Cash equivalents	Cash equivalents The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be cash equivalents. Cash equivalents that are readily convertible to cash are stated at cost, which approximates fair value. At June 30, 2022 and December 31, 2021, the Company held cash of $0.3 million in banks located outside of the United States.
Restricted cash	Restricted cash As of June 30, 2022 and December 31, 2021, the Company was required to maintain guaranteed investment certificates of $0.3 million with maturities of three months to one year that are subject to an insignificant risk of changes in value. The guaranteed investment certificates are held for the benefit of the landlord in connection with an operating lease which has a remaining term of greater than one year and are classified as restricted cash (non-current) on the Company’s consolidated balance sheets.
Software Development Costs	Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, “Internal-Use Software . For the three months ended June 30, 2022 and 2021, there was
Fair value measurements	Fair value measurements Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: ● Level 1—Quoted prices in active markets for identical assets or liabilities. ● Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. ● Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The Company’s cash equivalents, short-term and long-term investments are carried at fair value, determined according to the fair value hierarchy described above (see Note 3). The carrying values of the Company’s accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities.
Product warranties	Product warranties The Company offers a one-year limited assurance warranty on System sales, which is included in the selling price. The warranty accrual is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets. The following table presents a summary of changes in the amount reserved for warranty cost (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Balance, beginning of period ​ $ 595 ​ $ 618 ​ $ 598 ​ $ 637 Warranty provisions ​ ​ 341 ​ ​ — ​ ​ 351 ​ ​ — Warranty repairs ​ — ​ (6) ​ (13) ​ (25) Balance, end of period ​ $ 936 ​ $ 612 ​ $ 936 ​ $ 612 ​
Segment information	Segment information The Company determined its operating segment after considering the Company’s organizational structure and the information regularly reviewed and evaluated by the Company’s chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. The Company has determined that its CODM is its Chief Executive Officer. The CODM reviews the financial information on a consolidated basis for purposes of evaluating financial performance and allocating resources. On the basis of these factors, the Company determined that it operates and manages its business as one operating segment, that develops, manufactures, markets and sells Systems and related LIMS connection software, consumables and services; and accordingly has one reportable segment for financial reporting purposes. Substantially all of the Company’s long-lived assets are held in the United States.
Revenue recognition	Revenue recognition Remaining performance obligations The Company does not disclose the value of remaining performance obligations for (i) contracts with an original contract term of one year or less, (ii) contracts for which the Company recognizes revenue at the amount to which it has the right to invoice when that amount corresponds directly with the value of services performed, and (iii) Contract balances from contracts with customers Contract assets arise from unbilled amounts in customer arrangements when revenue recognized exceeds the amount billed to the customer and the Company’s right to payment is conditional and not only subject to the passage of time. The Company had $0.1 million and $0.3 million in contract assets as of June 30, 2022 and December 31, 2021, respectively, included in prepaid expenses and other current assets. These balances relate to unbilled amounts with commercial customers, as well as amounts due under the BARDA (as defined below) agreements. Contract liabilities represent the Company’s obligation to transfer goods or services to a customer for which it has received consideration (or the amount is due) from the customer. The Company has a contract liability related to service revenue, which consists of amounts that have been invoiced but that have not been recognized as revenue. Amounts expected to be recognized as revenue within 12 months of the balance sheet date are classified as current deferred revenue and amounts expected to be recognized as revenue beyond 12 months of the balance sheet date are classified as noncurrent deferred revenue. The Company did not record any non-current deferred revenue as of June 30, 2022 or December 31, 2021. Deferred revenue was $3.9 million and $3.3 million at June 30, 2022 and December 31, 2021, respectively. Revenue recognized during the three months ended June 30, 2022 and 2021 that was included in deferred revenue at the prior period-end was $0.8 million and $1.6 million, respectively. Revenue recognized during the six months ended June 30, 2022 and 2021 that was included in deferred revenue at the prior period-end was $1.9 million and $2.8 million, respectively. Non-commercial revenue The Company has historically generated revenue from a long-term contract with the U.S. Department of Health and Human Services Biomedical Advanced Research and Development Authority (“BARDA”) a part of the U.S. government. The Company’s contracts with the U.S. government typically are subject to the Federal Acquisition Regulation (“FAR”) and are priced based on estimated or actual costs of producing goods or providing services. The FAR provides guidance on the types of costs that are allowable in establishing prices for goods or services provided under U.S. government contracts. In September 2017, the Company signed a contract with BARDA, which was subsequently modified on multiple occasions to increase the contract value and adjust the cost share reimbursement rate. Modifications were accounted for in accordance with the contract modification framework. The contract is a cost-reimbursable, cost- sharing arrangement, whereby BARDA reimburses the Company for a percentage of the total costs that have been incurred including indirect allowable costs. All funding under this contract was fully earned by the fourth quarter of 2021. Disaggregated revenue The Company disaggregates revenue based on the recurring and non-recurring, and commercial and non-commercial, nature of the underlying sale. Recurring revenue includes sales of consumables and service contracts. Non-recurring revenue includes sales of Systems, LIMS connection software, validation services, field service, and revenue under the Company’s contract with BARDA. The following table presents the Company’s revenue by the recurring or non-recurring and commercial or non-commercial nature of the revenue stream (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Product and service revenue — recurring ​ $ 2,500 ​ $ 1,904 ​ $ 5,158 ​ $ 3,368 Product and service revenue — non-recurring ​ 1,360 ​ 3,790 ​ 2,862 ​ 7,111 Non-commercial revenue — non-recurring ​ — ​ 436 ​ — ​ 646 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125 The following table presents the Company’s revenue by customer geography (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 United States ​ $ 2,319 ​ $ 3,446 ​ $ 4,361 ​ $ 5,773 Germany ​ 401 ​ 636 ​ 825 ​ 965 Switzerland ​ 609 ​ 1,048 ​ 1,488 ​ 2,090 All other countries ​ 531 ​ ​ 1,000 ​ ​ 1,346 ​ ​ 2,297 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125 ​
Advertising costs	Advertising costs Advertising costs are expensed as incurred and are included in sales and marketing expenses in the condensed consolidated statements of operations. Advertising costs were less than $0.1 million during the three and six months ended June 30, 2022 and 2021.
Stock-based compensation	Stock-based compensation The Company measures all stock-based awards granted to employees, officers and directors based on their fair value on the date of the grant and recognizes compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award. The Company issues stock-based awards with only service-based vesting conditions and records the expense for these awards using the straight-line method. Forfeitures are accounted for prospectively as they occur. The Company measures all restricted common stock and restricted stock units granted to employees based on the common stock value on the date of grant. The purchase price of the restricted common stock is the common stock value on the date of grant. The restricted common stock includes a repurchase right, whereas upon the occurrence of a specific event, the Company shall have the right to repurchase unvested restricted common stock shares. At June 30, 2022 and December 31, 2021, the Company had $0.3 million and $0.5 million, respectively, in unvested restricted Class A common stock liability included in other long-term liabilities.
Comprehensive loss	Comprehensive loss Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than those with stockholders. For the three months ended June 30, 2022 and 2021, there were $0.3 million and less than $0.1 million, respectively, and for the six months ended June 30, 2022 and 2021, there were $0.9 million and less than $0.1 million, respectively, of unrealized losses on short-term and long-term investments, net of tax.
Recently adopted and issued accounting pronouncements	Recently adopted accounting pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ​ The Company leases office and manufacturing space under operating lease agreements. The Company leases furniture under a financing agreement. The Company adopted Topic 842 on January 1, 2022 using the optional transition method to the modified retrospective approach. Under this transition provision, results for reporting periods beginning on January 1, 2022 are presented under Topic 842 while prior period amounts continue to be reported and disclosed in accordance with the Company’s historical accounting treatment under ASC Topic 840, Leases ​ The Company elected the “package of practical expedients” permitted under the transition guidance, which among other things, does not require reassessment of whether contracts entered into prior to adoption are or contain leases, and allows carryforward of the historical lease classification for existing leases. The Company did not elect the “hindsight” practical expedient, and therefore measured the ROU assets and lease liabilities using the remaining portion of the lease term at adoption on January 1, 2022. ​ The Company made an accounting policy election not to recognize ROU assets and lease liabilities for leases with a term of twelve months or less. For all other leases, the Company recognizes ROU assets and lease liabilities based on the present value of lease payments over the lease term at the commencement date of the lease (or January 1, 2022 for existing leases upon the adoption of ASC 842). Lease payments may include fixed rent escalation clauses or payments that depend on an index (such as the consumer price index). Subsequent changes to an index and any other periodic market-rate adjustments to base rent are recorded in variable lease expense in the period incurred. The ROU assets also include any initial direct costs incurred and lease payments made at or before the commencement date and are reduced by any lease incentives. ​ The Company has made an accounting policy election to account for lease and non-lease components in its contracts as single lease components for all asset classes. The non-lease components typically represent additional services transferred to the Company, such as common area maintenance for real estate, which are variable in nature and recorded in variable lease expense in the period incurred. ​ The Company uses its incremental borrowing rate which is the rate of interest the Company would have to pay to borrow on a collateralized basis over a similar term and amount in a similar economic environment to determine the present value of lease payments as the Company’s leases do not have a readily determinable implicit discount rate. Judgment is applied in assessing factors such as Company specific credit risk, lease term, nature, and quality of the underlying collateral, currency, and economic environment in determining the incremental borrowing rate to apply to each lease. ​ Upon adoption, the Company recorded operating lease ROU assets and lease liabilities of $6.0 million and $7.0 million, respectively, the difference relating to deferred rent. The Company recorded financing lease ROU assets and lease liabilities ​ In December 2019, the FASB issued ASU 2019-12, Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes ​ Recently issued accounting pronouncements The Company qualifies as an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected not to “opt out” of the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the newer revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for nonpublic companies. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326)

Summary of significant accoun_3

Summary of significant accounting policies (Tables)	6 Months Ended
	Jun. 30, 2022
Summary of significant accounting policies
Schedule of concentration risk of customers that represent 10% or more of the Company's total revenue and accounts receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ 2022 2021 2022 2021 Customer A 28.3 % * ​ 21.7 % * ​ Customer B ​ 15.0 % * ​ ​ * ​ * ​ Customer C ​ 14.0 % * ​ ​ * ​ * ​ Customer D ​ * ​ * ​ ​ * ​ 13.7 % Customer E * ​ 15.9 % * ​ * ​ ​ 57.3 % 15.9 % 21.7 % 13.7 % * – less than 10% The following table presents customers that represent 10% or more of the Company’s accounts receivable: ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ ​ 2022 2021 Customer A ​ 20.4 % 19.5 % Customer B ​ 15.9 % 12.6 % Customer C 14.1 % * ​ Customer F ​ 12.7 % * ​ Customer G ​ * ​ 10.6 % Customer H * ​ 10.0 % ​ 63.1 % 52.7 % * – less than 10%
Summary of changes in the amount reserved for warranty cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Balance, beginning of period ​ $ 595 ​ $ 618 ​ $ 598 ​ $ 637 Warranty provisions ​ ​ 341 ​ ​ — ​ ​ 351 ​ ​ — Warranty repairs ​ — ​ (6) ​ (13) ​ (25) Balance, end of period ​ $ 936 ​ $ 612 ​ $ 936 ​ $ 612
Schedule of disaggregated revenue by nature and geographic location	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Product and service revenue — recurring ​ $ 2,500 ​ $ 1,904 ​ $ 5,158 ​ $ 3,368 Product and service revenue — non-recurring ​ 1,360 ​ 3,790 ​ 2,862 ​ 7,111 Non-commercial revenue — non-recurring ​ — ​ 436 ​ — ​ 646 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125 The following table presents the Company’s revenue by customer geography (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 United States ​ $ 2,319 ​ $ 3,446 ​ $ 4,361 ​ $ 5,773 Germany ​ 401 ​ 636 ​ 825 ​ 965 Switzerland ​ 609 ​ 1,048 ​ 1,488 ​ 2,090 All other countries ​ 531 ​ ​ 1,000 ​ ​ 1,346 ​ ​ 2,297 Total revenue ​ $ 3,860 ​ $ 6,130 ​ $ 8,020 ​ $ 11,125

Fair value of financial asset_2

Fair value of financial assets and liabilities (Tables)	6 Months Ended
	Jun. 30, 2022
Fair value of financial assets and liabilities
Schedule of information about the Company's financial assets and liabilities measured at fair value on a recurring basis	The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value measurements as of June 30, 2022 ​ Level 1 Level 2 Level 3 Total Assets ​ ​ ​ ​ ​ Cash equivalents ​ $ 45,132 ​ $ — ​ $ — ​ $ 45,132 Short-term investments ​ 94,371 ​ — ​ — ​ 94,371 Long-term investments ​ ​ 22,816 ​ ​ — ​ ​ — ​ ​ 22,816 ​ ​ $ 162,319 ​ $ — ​ $ — ​ $ 162,319 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value measurements at December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets ​ ​ ​ ​ ​ Cash equivalents ​ $ 173,755 ​ $ — ​ $ — ​ $ 173,755 Short-term investments ​ ​ 15,110 ​ ​ — ​ ​ — ​ ​ 15,110 Long-term investments ​ 9,966 ​ — ​ — ​ 9,966 ​ ​ $ 198,831 ​ $ — ​ $ — ​ $ 198,831

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2022
Investments
Schedule of short-term and long-term investments by investment type	Short-term and long-term investments by investment type consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ Amortized unrealized unrealized Fair ​ cost gains losses value Short-term investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Government Treasury Bills ​ $ 47,371 ​ $ — ​ $ (137) ​ $ 47,234 U.S. Government Treasury Notes ​ ​ 47,595 ​ ​ — ​ ​ (458) ​ ​ 47,137 ​ ​ $ 94,966 ​ $ — ​ $ (595) ​ $ 94,371 Long-term Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Certificates of Deposit ​ ​ 1,169 ​ ​ — ​ ​ (5) ​ ​ 1,164 U.S. Government Treasury Notes - Maturity One - Two Years ​ ​ 21,971 ​ ​ 16 ​ ​ (335) ​ ​ 21,652 ​ ​ $ 23,140 ​ $ 16 ​ $ (340) ​ $ 22,816 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ Amortized unrealized unrealized Fair Short-term investments cost gains losses value U.S. Government Treasury Bills ​ $ 4,983 ​ $ — ​ $ (2) ​ $ 4,981 U.S. Government Treasury Notes ​ ​ 10,142 ​ ​ — ​ ​ (13) ​ ​ 10,129 ​ ​ $ 15,125 ​ $ — ​ $ (15) ​ $ 15,110 Long-term Investments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Government Treasury Notes - Maturity One - Five Years ​ $ 9,966 ​ $ — ​ $ — ​ $ 9,966 ​ ​ $ 9,966 ​ $ — ​ $ — ​ $ 9,966

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Jun. 30, 2022
Inventory
Summary of Inventory	Inventory consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Raw materials ​ $ 12,559 ​ $ 10,135 Work in process ​ 722 ​ 1,235 Finished goods ​ 8,012 ​ 4,301 Total ​ $ 21,293 ​ $ 15,671

Prepaid expenses and other cu_2

Prepaid expenses and other current assets (Tables)	6 Months Ended
	Jun. 30, 2022
Prepaid expenses and other current assets
Schedule of prepaid expenses and other current assets	Prepaid expenses and other current assets consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Prepaid insurance ​ $ 131 ​ $ 1,622 Contract asset ​ 123 ​ 396 Deposits ​ 1,009 ​ 1,262 Lease receivables, current portion ​ 103 ​ 231 Other ​ 633 ​ 440 ​ ​ $ 1,999 ​ $ 3,951

Property and equipment, net (Ta

Property and equipment, net (Tables)	6 Months Ended
	Jun. 30, 2022
Property and equipment, net
Schedule of property and equipment, net	Property and equipment, net consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Manufacturing and laboratory equipment ​ $ 11,737 ​ $ 13,277 Computer hardware and software ​ 1,553 ​ 1,742 Office furniture and fixtures ​ 580 ​ 745 Leasehold improvements ​ ​ 8,243 ​ ​ 3,012 Construction-in-process ​ 1,001 ​ 4,313 ​ ​ 23,114 ​ 23,089 Less: Accumulated depreciation ​ (10,465) ​ (11,785) ​ ​ $ 12,649 ​ $ 11,304

Accrued expenses and other cu_2

Accrued expenses and other current liabilities (Tables)	6 Months Ended
	Jun. 30, 2022
Accrued expenses and other current liabilities
Schedule of accrued expenses and other current liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ 2022 2021 Accrued employee compensation and benefits expense ​ $ 2,321 ​ $ 3,569 Accrued vendor expenses ​ 1,588 ​ 5,500 Accrued warranty expense ​ 935 ​ 598 Deferred rent, current portion ​ — ​ 131 Accrued taxes ​ 237 ​ 781 Other ​ 200 ​ 338 ​ ​ $ 5,281 ​ $ 10,917

Preferred stock warrants (Table

Preferred stock warrants (Tables)	6 Months Ended
	Jun. 30, 2022
Preferred stock warrants
Schedule of information about weighted average of the unobservable inputs used to fair value the preferred stock warrant liability	The table below quantifies the weighted average of the unobservable inputs used to fair value the preferred stock warrant liability as of June 30, 2021, prior to their conversion into common stock warrants: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ ​ 2021 2021 ​ Fair value of Series A1 preferred stock ​ $ 2.51 ​ ​ $ 2.52 ​ Fair value of Series B1 preferred stock ​ $ 2.88 ​ ​ $ 2.89 ​ Fair value of Series C1 preferred stock ​ $ 2.95 ​ ​ $ 2.96 ​ Remaining contractual term (in years) ​ 6.7 ​ ​ 6.8 ​ Risk-free interest rate ​ 1.1 % ​ 1.2 % Expected dividend yield ​ — % ​ — % Expected volatility ​ 42.2 % ​ 41.9 %
Schedule of information provides a rollforward of the aggregate fair values of the Company's preferred stock warrant liability	​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2021 2021 Balance, beginning of period ​ $ 15,565 ​ $ 4,117 Change in fair value ​ 35 ​ 11,483 Balance, end of period ​ $ 15,600 ​ $ 15,600

Common stock and common stock_2

Common stock and common stock warrants (Tables)	6 Months Ended
	Jun. 30, 2022
Common stock and common stock warrant
Preferred stock warrants
Schedule of warrants to purchase the following classes of preferred stock outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ ​ ​ ​ Shares of ​ ​ ​ ​ ​ ​ ​ ​ common stock ​ ​ ​ ​ ​ ​ ​ Balance sheet ​ issuable upon ​ Weighted average Issuance date Contractual term classification exercise of warrant exercise price ​ ​ (in years) ​ ​ ​ ​ ​ ​ ​ July 24, 2017 ​ 10 ​ Equity ​ 17,194 ​ $ 292.81 April 12, 2018 ​ 10 ​ Equity ​ 30,000 ​ $ 1.00 July 14, 2021 ​ 10 ​ Equity ​ 975,109 ​ $ 1.46 ​ ​ ​ ​ ​ ​ 1,022,303 ​ ​ ​ ​ As of December 31, 2021, outstanding warrants to purchase common stock outstanding consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ Shares of ​ ​ ​ ​ ​ ​ ​ ​ common stock ​ ​ ​ ​ ​ ​ ​ Balance sheet ​ issuable upon ​ Weighted average Issuance date Contractual term classification exercise of warrant exercise price ​ ​ (in years) ​ ​ ​ ​ ​ ​ ​ July 24, 2017 ​ 10 ​ Equity ​ 25,835 ​ $ 295.15 April 12, 2018 ​ 10 ​ Equity ​ 30,000 ​ $ 1.00 July 14, 2021 ​ 10 ​ Equity ​ 975,109 ​ $ 1.46 ​ ​ ​ ​ ​ ​ 1,030,944 ​ ​ ​

Stock-based compensation (Table

Stock-based compensation (Tables)	6 Months Ended
	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of assumptions used to determine the grant-date fair value of stock options	The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted to employees and directors: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ 2022 2021 ​ 2022 2021 Risk-free interest rate 2.85 % 1.1 % ​ 2.00 % 1.0 % Expected term (in years) 5.9 6.1 ​ ​ 6.0 6.0 ​ Expected volatility 43.9 % 43.1 % ​ 43.1 % 44.3 % Expected dividend yield 0 % 0 % ​ 0 % 0 %
Schedule of stock option activity	The following table summarizes the Company’s stock option activity since December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ average ​ ​ ​ ​ Number of ​ average ​ remaining ​ Aggregate ​ shares exercise price contractual term intrinsic value ​ ​ ​ ​ ​ ​ ​ (in years) ​ ​ (in thousands) Outstanding as of December 31, 2021 4,823,100 ​ $ 5.06 7.62 ​ $ 31,041 Granted 1,542,759 ​ 7.53 ​ ​ ​ ​ ​ Exercised (475,033) ​ 0.99 ​ ​ ​ ​ ​ Expired (5,546) ​ 10.74 ​ ​ ​ ​ ​ Forfeited (212,152) ​ 11.85 ​ ​ ​ ​ ​ Outstanding as of June 30, 2022 5,673,128 ​ $ 5.79 ​ 8.15 ​ $ 9,010 Options vested and expected to vest as of June 30, 2022 5,673,128 ​ $ 5.79 ​ 8.15 ​ $ 9,010 Options exercisable as of June 30, 2022 2,426,101 ​ $ 2.72 ​ 6.78 ​ $ 6,687
Schedule of restricted stock activity	The following table summarizes the Company’s restricted stock activity since December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number of ​ average ​ shares fair value ​ ​ ​ ​ ​ Unvested as of December 31, 2021 ​ 248,903 ​ $ 2.10 Granted ​ - ​ ​ - Vested ​ (82,967) ​ $ 2.10 Forfeited ​ - ​ ​ - Unvested as of June 30, 2022 ​ 165,936 ​ $ 2.10
Schedule of assumptions used to determine fair value of 2021 ESPP	The following weighted average assumptions were used in the calculation of fair value of shares under the 2021 ESPP at the grant date for the three and six months ended June 30, 2022 (there were no offering periods for the three and six months ended June 30, 2021): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ ​ ​ 2022 ​ 2022 ​ Risk-free interest rate ​ ​ 0.86 % ​ 0.86 % Expected term (in years) ​ 0.5 0.5 Expected volatility ​ 43.1 % 43.1 % Expected dividend yield ​ 0 % 0 %
Schedule of stock-based compensation expense was classified in the consolidated statements of operations	Stock-based compensation Stock-based compensation expense was classified in the condensed consolidated statements of operations as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Cost of revenue ​ $ 164 ​ $ 85 ​ $ 264 ​ $ 115 Research and development ​ 100 ​ 37 ​ 179 ​ 49 Sales and marketing ​ 142 ​ 60 ​ 276 ​ 82 General and administrative ​ 852 ​ 208 ​ 1,522 ​ 335 Total stock-based compensation expense ​ $ 1,258 ​ $ 390 ​ $ 2,241 ​ $ 581
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of restricted stock activity	The following table summarizes restricted stock units granted to Company employees during the six months ended June 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number of ​ average ​ shares fair value ​ ​ ​ ​ ​ Unvested as of December 31, 2021 ​ - ​ $ - Granted ​ 593,480 ​ ​ 7.62 Vested ​ - ​ ​ - Forfeited ​ (9,600) ​ ​ 7.58 Unvested as of June 30, 2022 ​ 583,880 ​ $ 7.62

Net loss per share (Tables)

Net loss per share (Tables)	6 Months Ended
	Jun. 30, 2022
Net loss per share
Schedule of basic and diluted net loss per share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, Six Months Ended June 30, ​ 2022 2021 2022 2021 Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Net loss ​ $ (13,090) ​ $ (11,831) ​ $ (28,020) ​ $ (33,932) Accretion of redeemable convertible preferred stock to redemption value ​ — ​ (1,184) ​ — ​ (1,971) Cumulative redeemable convertible preferred stock dividends ​ — ​ (885) ​ — ​ (2,296) Net loss attributable to common stockholders—basic and diluted ​ $ (13,090) ​ $ (13,900) ​ $ (28,020) ​ $ (38,199) Denominator: ​ ​ ​ ​ Weighted average Class A common shares outstanding—basic and diluted ​ ​ 36,940,676 ​ ​ 694,698 ​ ​ 36,443,792 ​ ​ 668,180 Weighted average Class B common shares outstanding—basic and diluted ​ ​ 5,553,379 ​ ​ — ​ ​ 5,902,815 ​ ​ — Total shares for EPS—basic and diluted ​ ​ 42,494,055 ​ ​ 694,698 ​ ​ 42,346,607 ​ ​ 668,180 Net loss per share attributable to Class A common stockholders—basic and diluted ​ $ (0.31) ​ $ (20.01) ​ $ (0.66) ​ $ (57.17) Net loss per share attributable to Class B common stockholders—basic and diluted ​ $ (0.31) ​ $ — ​ $ (0.66) ​ $ —
Schedule of common shares excluded from the computation of diluted net loss per share	​ ​ ​ ​ ​ ​ ​ Three and Six Months Ended June 30, ​ 2022 2021 Options to purchase common stock 5,673,128 4,512,084 Unvested restricted common stock ​ 749,816 ​ — Warrants to purchase common stock 286,324 55,835 Options to purchase common stock under ESPP ​ 46,477 ​ — Redeemable convertible preferred stock (as converted to common stock) — 31,104,299 Warrants to purchase preferred stock (as converted to warrants to purchase common stock) — 1,243,834 ​ 6,755,745 36,916,052

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2022
Leases
Summary of impact of the adoption of Topic 842	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As Reported ​ Adjustments ​ Adjusted ​ December 31, 2021 ASC 842 Adoption January 1, 2022 Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ Right-of-use assets, net, operating ​ $ — ​ $ 6,039 ​ $ 6,039 Right-of-use assets, net, financing ​ ​ — ​ ​ 366 ​ ​ 366 Property and equipment, net ​ ​ 11,304 ​ ​ (351) ​ ​ 10,953 Total assets ​ $ 11,304 ​ $ 6,054 ​ $ 17,358 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders' Equity ​ ​ ​ ​ ​ ​ ​ ​ ​ Current liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease liabilities, short-term, operating ​ $ — ​ $ 1,023 ​ $ 1,023 Lease liabilities, short-term, financing ​ ​ — ​ ​ 33 ​ ​ 33 Accrued expenses ​ ​ 10,917 ​ ​ (160) ​ ​ 10,757 Total current liabilities ​ $ 18,166 ​ $ 896 ​ $ 19,062 Lease liabilities, long-term, operating ​ ​ — ​ ​ 5,960 ​ ​ 5,960 Lease liabilities, long-term, financing ​ ​ — ​ ​ 341 ​ ​ 341 Deferred rent, long-term ​ ​ 813 ​ ​ (813) ​ ​ — Other long-term liabilities ​ ​ 1,210 ​ ​ (330) ​ ​ 880 Total liabilities ​ $ 20,189 ​ $ 6,054 ​ $ 26,243 Total stockholders' equity ​ $ 220,980 ​ $ — ​ $ 220,980 Total liabilities and stockholders' equity ​ $ 241,169 ​ $ 6,054 ​ $ 247,223
Supplemental cash flow information related to leases	Supplemental cash flow information related to leases is as follows (in thousands): ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2022 ​ ​ ​ ​ Cash paid for amounts included in measurement of lease liabilities: ​ ​ ​ Operating cash outflows - payments on operating leases ​ $ 583 Operating cash outflows - payments on financing leases ​ $ 21 Financing cash outflows - payments on financing leases ​ $ 16 Right-of-use assets obtained in exchange for new lease obligations: ​ ​ ​ Operating leases ​ $ 7,605 Financing leases ​ $ 366
Supplemental balance sheet information related to leases	Supplemental balance sheet information related to the Company’s operating and financing leases is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2022 ​ Operating Leases: ​ ​ ​ ​ Operating lease assets ​ $ 7,189 ​ ​ ​ ​ ​ ​ Accrued expenses and other current liabilities ​ $ 694 ​ Operating lease liabilities ​ ​ 7,405 ​ Total operating lease liabilities ​ $ 8,099 ​ ​ ​ ​ ​ ​ Financing Leases: ​ ​ ​ ​ Office furniture and fixtures ​ $ 386 ​ Accumulated depreciation ​ ​ (45) ​ Net property, plant and equipment ​ $ 341 ​ ​ ​ ​ ​ ​ Current portion of long-term debt ​ $ 35 ​ Long-term debt ​ ​ 322 ​ Total financing lease liabilities ​ $ 357 ​ ​ ​ ​ ​ ​ Weighted-average remaining lease term - operating leases: ​ ​ 7.04 ​ Weighted-average remaining lease term - financing leases: ​ ​ 7.00 ​ Weighted-average discount rate - operating leases: ​ ​ 3.7 % Weighted-average discount rate - financing leases: ​ ​ 12.0 %
Components of lease expense	The components of lease expense were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2022 ​ ​ Six Months Ended June 30, 2022 Operating lease cost ​ $ 288 ​ ​ $ 549 Financing lease cost - amortization of right-of-use asset ​ ​ 12 ​ ​ ​ 24 Financing lease cost - interest on lease liability ​ ​ 11 ​ ​ ​ 21 Short-term lease cost ​ ​ 15 ​ ​ ​ 31 Variable lease cost ​ ​ 150 ​ ​ ​ 316 Total lease cost ​ $ 476 ​ ​ $ 941
Maturities of the Company's financing lease liability	Maturities of the Company’s financing lease liability as of June 30, 2022 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Financing Leases 2022 (excluding the six months ended June 30) ​ $ 38 2023 ​ ​ 75 2024 ​ ​ 75 2025 ​ ​ 75 2026 ​ ​ 75 Thereafter ​ ​ 187 Total lease payments ​ $ 525 Less imputed interest ​ ​ (168) Total present value of lease liabilities ​ $ 357
Maturities of the Company's operating lease liabilities	Maturities of the Company’s operating lease liabilities as of June 30, 2022 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Operating Leases 2022 (excluding the six months ended June 30) ​ $ 624 2023 ​ ​ 1,273 2024 ​ ​ 1,306 2025 ​ ​ 1,339 2026 ​ ​ 1,372 Thereafter ​ ​ 3,627 Total lease payments ​ $ 9,541 Less imputed interest ​ ​ (1,171) Total present value of lease liabilities ​ $ 8,370 Maturities of the Company’s operating lease liabilities as of December 31, 2021 were as follows (in thousands): ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 31, 2021 2022 ​ $ 1,139 2023 ​ ​ 1,169 2024 ​ ​ 1,199 2025 ​ ​ 1,229 2026 ​ ​ 1,044 Thereafter ​ ​ 1,953 Total minimum lease commitments ​ $ 7,733

Nature of the business and ba_2

Nature of the business and basis of presentation - Initial Public Offering (Details) $ / shares in Units, $ in Millions	Aug. 04, 2021 USD ($) $ / shares shares	Jul. 19, 2021 USD ($) $ / shares shares	Jul. 09, 2021
Class of Stock [Line Items]
Reverse stock split ratio			0.2
IPO
Class of Stock [Line Items]
Stock issued during period shares new issues | shares		7,920,000
Share issued, price per share | $ / shares		$ 20
Gross proceeds		$ 158.4
Net proceeds		$ 143.8
Over Allotment Option
Class of Stock [Line Items]
Stock issued during period shares new issues | shares	1,086,604
Share issued, price per share | $ / shares	$ 20
Net proceeds	$ 20.2

Summary of significant accoun_4

Summary of significant accounting policies - Risk of Concentrations of Credit, Significant Customers and Significant Suppliers (Details) - Customers	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Total revenue | Major Customers
Concentration Risk [Line Items]
Customer concentration risk percentage	57.30%	15.90%	21.70%	13.70%
Total revenue | Customer A
Concentration Risk [Line Items]
Customer concentration risk percentage	28.30%		21.70%
Total revenue | Customer B
Concentration Risk [Line Items]
Customer concentration risk percentage	15%
Total revenue | Customer C
Concentration Risk [Line Items]
Customer concentration risk percentage	14%
Total revenue | Customer D
Concentration Risk [Line Items]
Customer concentration risk percentage				13.70%
Total revenue | Customer E
Concentration Risk [Line Items]
Customer concentration risk percentage		15.90%
Accounts receivable | Major Customers
Concentration Risk [Line Items]
Customer concentration risk percentage			63.10%		52.70%
Accounts receivable | Customer A
Concentration Risk [Line Items]
Customer concentration risk percentage			20.40%		19.50%
Accounts receivable | Customer B
Concentration Risk [Line Items]
Customer concentration risk percentage			15.90%		12.60%
Accounts receivable | Customer C
Concentration Risk [Line Items]
Customer concentration risk percentage			14.10%
Accounts receivable | Customer F
Concentration Risk [Line Items]
Customer concentration risk percentage			12.70%
Accounts receivable | Customer G
Concentration Risk [Line Items]
Customer concentration risk percentage					10.60%
Accounts receivable | Customer H
Concentration Risk [Line Items]
Customer concentration risk percentage					10%

Summary of significant accoun_5

Summary of significant accounting policies - Debt Issuance Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Summary of significant accounting policies
Debt issuance costs	$ 0		$ 0		$ 0
Amortization of the debt issuance costs	$ 0	$ 0.1	$ 0	$ 0.2

Summary of significant accoun_6

Summary of significant accounting policies - Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Summary of significant accounting policies
Cash	$ 0.3		$ 0.3		$ 0.3
Guaranteed investment certificates	0.3		0.3		$ 0.3
Software development costs capitalized	1.2		$ 1.2
Amortization period			5 years
Amortization expense	$ 0.1	$ 0	$ 0.2	$ 0

Summary of significant accoun_7

Summary of significant accounting policies - Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Summary of significant accounting policies
Balance, beginning of the period	$ 595	$ 618	$ 598	$ 637
Warranty provisions	341		351
Warranty repairs		(6)	(13)	(25)
Balance, end of the year	$ 936	$ 612	$ 936	$ 612
Warranty duration			1 year

Summary of significant accoun_8

Summary of significant accounting policies - Segment Information (Details)	6 Months Ended
	Jun. 30, 2022 segment
Summary of significant accounting policies
Number of operating segments	1
Number of reportable segments	1

Summary of significant accoun_9

Summary of significant accounting policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Summary of significant accounting policies
Contract assets	$ 0.1		$ 0.1		$ 0.3
Deferred revenue	3.9		3.9		$ 3.3
Revenue recognized included in deferred revenue in prior period	$ 0.8	$ 1.6	$ 1.9	$ 2.8

Summary of significant accou_10

Summary of significant accounting policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 3,860	$ 6,130	$ 8,020	$ 11,125
United states
Disaggregation of Revenue [Line Items]
Revenue recognized	2,319	3,446	4,361	5,773
Germany
Disaggregation of Revenue [Line Items]
Revenue recognized	401	636	825	965
Switzerland
Disaggregation of Revenue [Line Items]
Revenue recognized	609	1,048	1,488	2,090
All other countries
Disaggregation of Revenue [Line Items]
Revenue recognized	531	1,000	1,346	2,297
Product and service revenue - recurring
Disaggregation of Revenue [Line Items]
Revenue recognized	2,500	1,904	5,158	3,368
Product and service revenue - non-recurring
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 1,360	3,790	$ 2,862	7,111
Non-commercial revenue - non-recurring
Disaggregation of Revenue [Line Items]
Revenue recognized		$ 436		$ 646

Summary of significant accou_11

Summary of significant accounting policies - Advertising Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Maximum
Class of Stock [Line Items]
Advertising costs	$ 0.1	$ 0.1	$ 0.1	$ 0.1

Summary of significant accou_12

Summary of significant accounting policies - Stock-based compensation (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other long-term liabilities | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of restricted common stock liability	$ 0.3	$ 0.5

Summary of significant accou_13

Summary of significant accounting policies - Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Unrealized losses on short-term and long-term investments, net of tax	$ (315)	$ (1)	$ (903)	$ (1)
Maximum
Unrealized losses on short-term and long-term investments, net of tax		$ (100)		$ (100)

Summary of significant accou_14

Summary of significant accounting policies - Recently issued accounting pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jan. 01, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use assets	$ 7,189
Operating lease liabilities	8,099
Finance lease, right-of-use assets	341
Finance lease liabilities	$ 357
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use assets		$ 6,000
Operating lease liabilities		7,000
Finance lease, right-of-use assets		400
Finance lease liabilities		$ 400

Fair value of financial asset_3

Fair value of financial assets and liabilities - Financial Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash equivalents	$ 45,132	$ 173,755
Assets	162,319	198,831
Short-term Investments
Assets
Investments	94,371	15,110
Long-term investments
Assets
Investments	22,816	9,966
Level 1
Assets
Cash equivalents	45,132	173,755
Assets	162,319	198,831
Level 1 | Short-term Investments
Assets
Investments	94,371	15,110
Level 1 | Long-term investments
Assets
Investments	$ 22,816	$ 9,966

Fair value of financial asset_4

Fair value of financial assets and liabilities - Transfers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair value of financial assets and liabilities
Asset transferred, L1 to L2	$ 0	$ 0	$ 0	$ 0
Asset transferred, L2 to L1	0	0	0	0
Liabilities transferred, L1 to L2	0	0	0	0
Liabilities transferred, L2 to L1	0	0	0	0
Asset transferred, into L3	0	0	0	0
Asset transferred, out of L3	0	0	0	0
Liabilities transferred, into L3	0	0	0	0
Liabilities transferred, out of L3	$ 0	$ 0	$ 0	$ 0

Investments (Details)

Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 94,966	$ 15,125
Gross unrealized losses	(595)	(15)
Fair value	94,371	15,110
U.S. Treasury bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	47,595	10,142
Gross unrealized losses	(458)	(13)
Fair value	47,137	10,129
US Treasury Bill
Debt Securities, Available-for-sale [Line Items]
Amortized cost	47,371	4,983
Gross unrealized losses	(137)	(2)
Fair value	47,234	4,981
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	23,140	9,966
Gross unrealized gains	16
Gross unrealized losses	(340)
Fair value	22,816	9,966
US Treasury Notes
Debt Securities, Available-for-sale [Line Items]
Amortized cost	21,971	9,966
Gross unrealized gains	16
Gross unrealized losses	(335)
Fair value	21,652	$ 9,966
Certificates of Deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,169
Gross unrealized losses	(5)
Fair value	$ 1,164

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory
Raw materials	$ 12,559	$ 10,135
Work in process	722	1,235
Finished goods	8,012	4,301
Total	21,293	15,671
Inventory adjustments	$ 600	$ 1,200

Prepaid expenses and other cu_3

Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid expenses and other current assets
Prepaid insurance	$ 131	$ 1,622
Contract asset	123	396
Deposits	1,009	1,262
Lease receivables, current portion	103	231
Other	633	440
Prepaid expenses and other current assets	$ 1,999	$ 3,951

Property and equipment, net (De

Property and equipment, net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 23,114	$ 23,089
Less: Accumulated depreciation	(10,465)	(11,785)
Property plant and equipment, net	12,649	11,304
Manufacturing and laboratory equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	11,737	13,277
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	1,553	1,742
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	580	745
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	8,243	3,012
Construction-in-process
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 1,001	$ 4,313

Property and equipment, net - D

Property and equipment, net - Depreciation and amortization (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 0.6	$ 0.3	$ 1.1	$ 0.7
Fully depreciated assets disposed of	$ 2.3		$ 2.3
Maximum
Property, Plant and Equipment [Line Items]
Fully depreciated assets disposed of		$ 0.1		$ 0.1

Accrued expenses and other cu_3

Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued expenses and other current liabilities
Accrued employee compensation and benefits expense	$ 2,321	$ 3,569
Accrued vendor expenses	1,588	5,500
Accrued warranty expense	935	598
Deferred rent, current portion		131
Accrued taxes	237	781
Other	200	338
Accrued expenses and other current liabilities	$ 5,281	$ 10,917

Long-term debt (Details)

Long-term debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Long-term debt
Long-term debt outstanding	$ 0	$ 0

Long-term debt - Term loans agr

Long-term debt - Term loans agreements (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Sep. 30, 2021 USD ($)	May 31, 2020 USD ($) item $ / shares shares	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
2020 Term Loan
Debt Instrument [Line Items]
Loan amount		$ 60
Interest expenses			$ 0.9	$ 1.8
Amortization of debt discount		0.3	$ 0.1	$ 0.3
Facility fees		$ 0.8
Number of loan tranches | item		3
Debt issuance costs		$ 1.5
Professional fees		0.9
Debt issuance cost allocated to warrant issued		$ 0.6
Loss on extinguishment of debt	$ 3.1
Prepayment Penalty	1.8
Expense to unamortized discounts	1.1
Unamortized prepaid facility fees and other charges	$ 0.2
2020 Term Loan | Series C1 Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Shares issued upon conversion of warrant | shares		1,195,652
Exercise price | $ / shares		$ 1.15
2020 Term Loan- Tranche One
Debt Instrument [Line Items]
Loan amount		$ 25
2020 Term Loan- Tranche Two and Three
Debt Instrument [Line Items]
Loan amount		35
2020 Term Loan- Tranche Two
Debt Instrument [Line Items]
Loan amount		20
Debt issuance costs		0.3
2020 Term Loan- Tranche Three
Debt Instrument [Line Items]
Loan amount		15
Debt issuance costs		$ 0.2

Redeemable convertible prefer_2

Redeemable convertible preferred stock (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 14, 2021	Jun. 25, 2021	Mar. 31, 2021	Mar. 31, 2021	Jun. 30, 2021	Jul. 19, 2021
Redeemable convertible preferred stock
Temporary equity share price (in dollars per share)						$ 0.01
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs					$ 79,743
Preferred stock, authorized (in shares)						10,000,000
Peferred stock , par value (in shares)						$ 0.01
Series C2 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock
Number of shares exchanged		11,437,301
Series D1 and D2 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock
Temporary equity share price (in dollars per share)			$ 3.60	$ 3.60
Issuance costs			$ 1,300
Peferred stock , par value (in shares)			$ 3.60	$ 3.60
Series D1 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock
Shares issued			22,086,725	22,086,725
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs			$ 79,500
Series D2 Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock
Shares issued			413,268	413,268
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs			$ 1,500
Number of shares exchanged		2,364,509
Common Class A
Redeemable convertible preferred stock
Conversion of Stock, Shares Issued	24,200,920
Common Class B
Redeemable convertible preferred stock
Conversion of Stock, Shares Issued	6,903,379

Preferred stock warrants (Detai

Preferred stock warrants (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2022	Dec. 31, 2021	May 31, 2020
2020 Term Loan | Series C1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Shares issued upon conversion of warrant			1,195,652
Exercise price			$ 1.15
Preferred stock warrant
Class of Warrant or Right [Line Items]
Shares issued upon conversion of warrant	0	0
Preferred stock warrant | Series C1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Exercise price			$ 1.15
Warrant expiry term			10 years
Warrant fair value			$ 0.7

Preferred stock warrants - Weig

Preferred stock warrants - Weighted Average of the Unobservable Inputs Used to Fair Value (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2021 Y $ / shares	Jun. 30, 2021 Y $ / shares
Remaining contractual term (in years)
Class of Warrant or Right [Line Items]
Preferred stock warrant liability, measurement input | Y	6.7	6.8
Risk-free interest rate
Class of Warrant or Right [Line Items]
Preferred stock warrant liability, measurement input	0.011	0.012
Expected volatility
Class of Warrant or Right [Line Items]
Preferred stock warrant liability, measurement input	0.422	0.419
Series A1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Fair value of preferred stock warrant liability	$ 2.51	$ 2.52
Series B1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Fair value of preferred stock warrant liability	2.88	2.89
Series C1 Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Fair value of preferred stock warrant liability	$ 2.95	$ 2.96

Preferred stock warrants - Roll

Preferred stock warrants - Rollforward of the Aggregate Fair Values (Details) - Preferred stock warrant liability - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 15,565	$ 4,117
Change in fair value	35	11,483
Balance, end of period	$ 15,600	$ 15,600

Common stock and common stock_3

Common stock and common stock warrants (Details) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) Vote $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Jul. 19, 2021 shares	Jun. 30, 2021 shares
Common stock and common stock warrants
Cash dividends | $	$ 0	$ 0
Shares reserved				20,268,510
Common Class A
Common stock and common stock warrants
Common stock, authorized (in shares)	210,000,000	210,000,000	210,000,000
Common stock, issued (in shares)	36,389,073	34,564,040
Common stock, outstanding (in shares)	36,389,073	34,564,040
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Number of votes | Vote	1
Common Class B
Common stock and common stock warrants
Common stock, authorized (in shares)	10,000,000	10,000,000	10,000,000
Common stock, issued (in shares)	5,553,379	6,903,379
Common stock, outstanding (in shares)	5,553,379	6,903,379
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01

Common stock and common stock_4

Common stock and common stock warrants - Warrants (Details) - Common stock and common stock warrant - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Common stock and common stock warrants
Common stock shares issuable upon exercise of warrant	1,022,303	1,030,944
Equity | July 24, 2017
Common stock and common stock warrants
Contractual term (in years)	10 years	10 years
Common stock shares issuable upon exercise of warrant	17,194	25,835
Weighted average exercise price (in dollars per share)	$ 292.81	$ 295.15
Equity | April 12, 2018
Common stock and common stock warrants
Contractual term (in years)	10 years	10 years
Common stock shares issuable upon exercise of warrant	30,000	30,000
Weighted average exercise price (in dollars per share)	$ 1	$ 1
Equity | July 14, 2021
Common stock and common stock warrants
Contractual term (in years)	10 years	10 years
Common stock shares issuable upon exercise of warrant	975,109	975,109
Weighted average exercise price (in dollars per share)	$ 1.46	$ 1.46

Stock-based compensation - 2010

Stock-based compensation - 2010 Stock Option and Grant Plan (Details) - shares	1 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		1,542,759
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized	382,889
Granted		0

Stock-based compensation - 2021

Stock-based compensation - 2021 Incentive Award Plan (Details) - 2021 Incentive Award Plan - shares	1 Months Ended
	Jul. 31, 2021	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards	10 years
Number of shares authorized	4,200,000
Threshold annual increase in shares available for issuance expressed as a percentage	5%
Maximum number of shares issuable upon exercise of stock option	33,900,000
Shares avaliable for issuance		3,593,599

Stock-based compensation - Weig

Stock-based compensation - Weighted Average Basis Assumptions of Stock Options (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.86%		0.86%
Expected term (in years)	6 months		6 months
Expected volatility	43.10%		43.10%
Expected dividend yield	0%		0%
2021 Incentive Award Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.85%	1.10%	2%	1%
Expected term (in years)	5 years 10 months 24 days	6 years 1 month 6 days	6 years	6 years
Expected volatility	43.90%	43.10%	43.10%	44.30%
Expected dividend yield	0%	0%	0%	0%

Stock-based compensation - Stoc

Stock-based compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Number of shares
Outstanding as of December 31, 2021 (in shares)			4,823,100
Granted (in shares)			1,542,759
Exercised (in shares)			(475,033)
Expired (in shares)			(5,546)
Forfeited (in shares)			(212,152)
Outstanding as of June 30, 2022 (in shares)	5,673,128		5,673,128		4,823,100
Options vested and expected to vest as of June 30, 2022 (in shares)	5,673,128		5,673,128
Options exercisable as of June 30, 2022 (in shares)	2,426,101		2,426,101
Weighted average exercise price
Outstanding as of December 31, 2021 (in dollars per share)			$ 5.06
Granted (in dollars per share)			7.53
Exercised (in dollars per share)			0.99
Expired (in dollars per share)			10.74
Forfeited (in dollars per share)			11.85
Outstanding as of June 30 2022 (in dollars per share)	$ 5.79		5.79		$ 5.06
Options vested and expected to vest as of June 30, 2022 (in dollars per share)	5.79		5.79
Options exercisable as of June 30, 2022 (in dollars per share)	$ 2.72		$ 2.72
Weighted average remaining contractual term
Weighted average remaining contractual term (in years)			8 years 1 month 24 days		7 years 7 months 13 days
Options vested and expected to vest (in years)			8 years 1 month 24 days
Options exercisable (in years)			6 years 9 months 10 days
Aggregate intrinsic value
Aggregate intrinsic value	$ 9,010		$ 9,010		$ 31,041
Options vested and expected to vest	9,010		9,010
Options exercisable	$ 6,687		6,687
Exercised			$ 2,800	$ 300
Weighted average grant-date fair value	$ 2.40	$ 1.03	$ 3.30	$ 0.80

Stock-based compensation - Rest

Stock-based compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Feb. 28, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Share-based compensation
Proceeds from issuance of restricted Class A stock award			$ 523
Restricted Stock
Share-based compensation
Vesting Period	4 years
Proceeds from issuance of restricted Class A stock award	$ 500
Number of shares
Unvested as of December 31, 2021 (in shares)		248,903
Granted (in shares)	248,903
Vested (in shares)		(82,967)
Unvested as of June 30, 2022 (in shares)		165,936
Weighted average fair value
Unvested as of December 31, 2021 (in dollars per share)		$ 2.10
Granted (in dollars per share)	$ 2.10
Vested (in dollars per share)		2.10
Unvested as of June 30, 2022 (in dollars per share)		$ 2.10
Restricted Stock | Other long-term liabilities
Share-based compensation
Amount of restricted common stock liability		$ 300		$ 500

Stock-based compensation - Re_2

Stock-based compensation - Restricted stock units (Details) - Restricted Stock Units - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Number of shares
Granted (in shares)		593,480	0
Forfeited (in shares)		(9,600)
Unvested as of June 30, 2022 (in shares)	583,880	583,880
Weighted average fair value
Granted (in dollars per share)	$ 5	$ 7.62
Forfeited (in shares)		7.58
Unvested as of June 30, 2022 (in dollars per share)	$ 7.62	$ 7.62

Stock-based compensation - 20_2

Stock-based compensation - 2021 Employee Stock Purchase Plan (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1,258,000	$ 390,000	$ 2,241,000	$ 581,000
ESPP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 100,000		$ 100,000
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold limit of shares can be purchased by an employee per offering period	100,000
2021 Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards	10 years
Number of shares authorized	400,000
Threshold annual increase in shares available for issuance expressed as a percentage	1%
Maximum number of shares issuable upon exercise of stock option	6,300,000
Payroll deduction percentage	15%
Threshold value of shares can be purchased per calendar year	$ 25,000
Threshold percentage of the market price	85%
Shares avaliable for issuance		745,640		745,640
Offering Period			$ 0		$ 0
2021 Employee Stock Purchase Plan | ESPP | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased				0

Stock-based compensation - We_2

Stock-based compensation - Weighted Average Basis Assumptions of 2021 ESPP (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.86%	0.86%
Expected term (in years)	6 months	6 months
Expected volatility	43.10%	43.10%
Expected dividend yield	0%	0%

Stock-based compensation - St_2

Stock-based compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 1,258	$ 390	$ 2,241	$ 581
Stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized compensation expense	10,800		$ 10,800
Weighted average period			2 years 10 months 24 days
Restricted Stock Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Weighted average period			2 years 8 months 12 days
Unrecognized compensation expense related to RSU	3,900		$ 3,900
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	164	85	264	115
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	100	37	179	49
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	142	60	276	82
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 852	$ 208	$ 1,522	$ 335

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income taxes
Income tax benefit	$ (613)	$ 18	$ (590)	$ 37

Net loss per share - Basic and

Net loss per share - Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (13,090)	$ (14,930)	$ (11,831)	$ (22,101)	$ (28,020)	$ (33,932)
Accretion of redeemable convertible preferred stock to redemption value			(1,184)			(1,971)
Cumulative redeemable convertible preferred stock dividends			(885)			(2,296)
Net loss attributable to common stockholders - basic	(13,090)		(13,900)		(28,020)	(38,199)
Net loss attributable to common stockholders - diluted	$ (13,090)		$ (13,900)		$ (28,020)	$ (38,199)
Denominator:
Weighted average common shares outstanding - basic	42,494,055		694,698		42,346,607	668,180
Weighted average common shares outstanding - diluted	42,494,055		694,698		42,346,607	668,180
Net loss per share attributable to common stockholders - basic	$ (0.31)		$ (20.01)		$ (0.66)	$ (57.17)
Net loss per share attributable to common stockholders - diluted	$ (0.31)		$ (20.01)		$ (0.66)	$ (57.17)
Common Class A
Denominator:
Weighted average common shares outstanding - basic	36,940,676		694,698		36,443,792	668,180
Weighted average common shares outstanding - diluted	36,940,676		694,698		36,443,792	668,180
Net loss per share attributable to common stockholders - basic	$ (0.31)		$ (20.01)		$ (0.66)	$ (57.17)
Net loss per share attributable to common stockholders - diluted	$ (0.31)		$ (20.01)		$ (0.66)	$ (57.17)
Common Class B
Denominator:
Weighted average common shares outstanding - basic	5,553,379				5,902,815
Weighted average common shares outstanding - diluted	5,553,379				5,902,815
Net loss per share attributable to common stockholders - basic	$ (0.31)				$ (0.66)
Net loss per share attributable to common stockholders - diluted	$ (0.31)				$ (0.66)

Net loss per share - Schedule o

Net loss per share - Schedule of Common Stock Excluded From Computation of Diluted Net Loss per Share (Details) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share	6,755,745	36,916,052
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share	5,673,128	4,512,084
Unvested restricted common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share	749,816
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share	286,324	55,835
Options to purchase common stock under ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share	46,477
Redeemable convertible preferred stock (as converted to common stock)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share		31,104,299
Warrants to purchase preferred stock (as converted to warrants to purchase common stock)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares from the computation of diluted net loss per share		1,243,834

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets
Operating lease, right-of-use assets	$ 7,189
Finance lease, right-of-use assets	341
Property and equipment, net	12,649			$ 11,304
Current liabilities:
Lease liabilities, short-term, operating	694
Lease liabilities, short-term, financing	35
Accrued expenses	5,281			10,917
Total current liabilities	12,750			18,166
Lease liabilities, long-term, operating	7,405
Lease liabilities, long-term, financing	322
Deferred rent, long term				813
Other long-term liabilities	698			1,210
Total liabilities	21,176			20,189
Total stockholders' equity	194,967	$ 207,070		220,980	$ (164,526)	$ (151,047)	$ (127,006)
Total liabilities and stockholders' equity	$ 216,143			241,169
Finance lease, term of contract	8 years
Finance lease, Existence of option to extend	true
Finance lease, Renewal term	5 years
Minimum
Current liabilities:
Operating lease, term of contract	8 years
Maximum
Current liabilities:
Operating lease, term of contract	10 years
Accounting Standards Update 2016-02
Assets
Operating lease, right-of-use assets			$ 6,000
Finance lease, right-of-use assets			400
Property and equipment, net				11,304
Total assets				11,304
Current liabilities:
Accrued expenses				10,917
Total current liabilities				18,166
Deferred rent, long term				813
Other long-term liabilities				1,210
Total liabilities				20,189
Total stockholders' equity				220,980
Total liabilities and stockholders' equity				$ 241,169
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Assets
Operating lease, right-of-use assets			6,039
Finance lease, right-of-use assets			366
Property and equipment, net			(351)
Total assets			6,054
Current liabilities:
Lease liabilities, short-term, operating			1,023
Lease liabilities, short-term, financing			33
Accrued expenses			(160)
Total current liabilities			896
Lease liabilities, long-term, operating			5,960
Lease liabilities, long-term, financing			341
Deferred rent, long term			(813)
Other long-term liabilities			(330)
Total liabilities			6,054
Total liabilities and stockholders' equity			6,054
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Assets
Operating lease, right-of-use assets			6,039
Finance lease, right-of-use assets			366
Property and equipment, net			10,953
Total assets			17,358
Current liabilities:
Lease liabilities, short-term, operating			1,023
Lease liabilities, short-term, financing			33
Accrued expenses			10,757
Total current liabilities			19,062
Lease liabilities, long-term, operating			5,960
Lease liabilities, long-term, financing			341
Other long-term liabilities			880
Total liabilities			26,243
Total stockholders' equity			220,980
Total liabilities and stockholders' equity			$ 247,223

Leases - Supplemental cash flow

Leases - Supplemental cash flow information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Leases
Operating cash outflows - payments on operating leases	$ 583
Operating cash outflows - payments on financing leases	21
Financing cash outflows - payments on financing leases	16
Right-of-use assets obtained in exchange for new lease obligations: Operating leases	7,605
Right-of-use assets obtained in exchange for new lease obligations: Financing leases	$ 366

Leases - Supplemental balance s

Leases - Supplemental balance sheet information (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Leases
Operating lease assets	$ 7,189
Accrued expenses and other current liabilities	$ 694
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Operating and Finance Lease Liability, Current
Operating lease liabilities	$ 7,405
Total operating lease liabilities	8,099
Financing Leases:
Accumulated depreciation	(45)
Net property, plant and equipment	341
Current portion of long-term debt	$ 35
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Operating and Finance Lease Liability, Current
Long-term debt	$ 322
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating and Finance Lease Liability, Non Current
Total financing lease liabilities	$ 357
Weighted-average remaining lease term - operating leases:	7 years 14 days
Weighted-average remaining lease term - financing leases:	7 years
Weighted-average discount rate - operating leases:	3.70%
Weighted-average discount rate - financing leases	12%
Office furniture and fixtures
Financing Leases:
Gross property, plant and equipment	$ 386

Leases - Lease expense (Details

Leases - Lease expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Lease expense
Operating lease cost	$ 288	$ 549
Financing lease cost - amortization of right-of-use asset	12	24
Financing lease cost - interest on lease liability	11	21
Short-term lease cost	15	31
Variable lease cost	150	316
Total lease cost	$ 476	$ 941

Leases - Additional information

Leases - Additional information (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	May 31, 2022	Mar. 31, 2022	Jun. 30, 2022	Jun. 30, 2022
Leases
Rent expense			$ 0.4	$ 0.9
Option to extend		true
Renewal term		5 years
Tenant improvement allowance		$ 0.3
Amended future minimum lease payments		4.6
Operating lease not yet commenced, future minimum lease payments		0.9
Operating lease modification, right of use assets	$ 0.7	1.2
Operating lease modification, liability	$ 0.7	$ 1.3
Maximum
Leases
Capital lease asset depreciation and interest expense			$ 0.1	$ 0.1

Leases - Operating lease maturi

Leases - Operating lease maturity (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Year ending December 31,
2022 (excluding the six months ended June 30)	$ 624
2023	1,273
2024	1,306
2025	1,339
2026	1,372
Thereafter	3,627
Total lease payments	9,541
Less imputed interest	(1,171)
Total present value of lease liabilities	$ 8,370

Leases - Finance lease maturity

Leases - Finance lease maturity (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Maturities of the Company's financing lease liability
2022 (excluding the six months ended June 30)	$ 38
2023	75
2024	75
2025	75
2026	75
Thereafter	187
Total lease payments	525
Less imputed interest	(168)
Total financing lease liabilities	$ 357

Leases - Operating lease matu_2

Leases - Operating lease maturity as of December 31, 2021 (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Maturities of the Company's operating lease liabilities as of December 31, 2021
2022	$ 1,139
2023	1,169
2024	1,199
2025	1,229
2026	1,044
Thereafter	1,953
Total minimum lease commitments	$ 7,733

Commitments and contingencies -

Commitments and contingencies - Supply Agreement and Software Subscription (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Supply arrangement
Long-term Purchase Commitment [Line Items]
Accrued liability		$ 0.1
Supply agreement
Accrued supply agreement amount	$ 0.6
Supply arrangement | Maximum
Long-term Purchase Commitment [Line Items]
Accrued liability	0.1
Software subscription
Long-term Purchase Commitment [Line Items]
Obligation	0.8
Accrued liability	$ 0	$ 0.1

Benefit plans (Details)

Benefit plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Benefit plans
Contributions made	$ 0.2	$ 0.1	$ 0.5	$ 0.1

Subsequent events (Details)

Subsequent events (Details) - Subsequent events - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2022	Aug. 11, 2022
Subsequent events
Workforce reduction (as a percentage)		20%
Restructuring costs	$ 1.5