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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities    
Net loss $ (18,702) $ (15,586)
Adjustments to reconcile net loss to net cash, cash equivalents, and restricted cash used in operating activities    
Depreciation and amortization 785 908
Amortization of lease right-of-use assets 760 280
Share-based compensation expense 2,281 1,346
Change in fair value of warrant liability (61)  
Provision for doubtful accounts 198 (39)
Accrued interest, amortization of debt issuance costs and other 1,357 1,006
Inventory excess and obsolescence 30 379
Impairment loss on intangible assets 20 81
Changes in operating assets and liabilities:    
Accounts receivable (33) (78)
Other current assets 544 (166)
Other long-term assets (10) 466
Accounts payable and other accrued liabilities (2,031) (1,304)
Deferred revenue 129 (124)
Tenant improvement allowances received 7,248  
Current and long-term operating lease liabilities (201) (268)
Net cash and cash equivalents and restricted cash used in operating activities (7,686) (13,099)
Cash flows from investing activities    
Purchase of property and equipment (7,676) (262)
Patent costs and intangible asset acquisition, net (30) (90)
Net cash and cash equivalents and restricted cash used in investing activities (7,706) (352)
Cash flows from financing activities    
Proceeds from the issuance of common stock   1,599
Proceeds from issuance of common stock under employee stock purchase plan 420 202
Proceeds from exercise of stock options 6 75
Payment of contingent consideration (2,000) (4,625)
Proceeds from term loan and notes payable   103
Repayment of term loan and notes payable (12) (11)
Payment of debt issuance costs (801)  
Deferred offering costs   (30)
Equity financing costs   (141)
Other (34) (6)
Net cash and cash equivalents and restricted cash used in financing activities (2,421) (2,834)
Net decrease in cash and cash equivalents and restricted cash (17,813) (16,285)
Cash, cash equivalents, and restricted cash ‑ beginning of period 43,174 32,798
Cash, cash equivalents, and restricted cash ‑ end of period 25,361 16,513
Supplemental cash flow information:    
Common stock issued for deferred offering costs   600
Deferred offering costs amortized against Additional paid-in capital   18
Deferred issuance costs included in Accounts payable and other accrued liabilities   85
Equity financing costs included in Accounts payable and other accrued liabilities 61 24
Operating lease right-of-use assets obtained in exchange for lease liabilities at adoption of ASC 842   1,269
Operating lease right-of-use assets obtained in exchange for lease liabilities 43 1,228
Finance lease right-of-use assets obtained in exchange for lease liabilities 329 123
Cash paid for interest $ 1,032 $ 223