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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (13,614) $ (18,702)
Adjustments to reconcile net loss to net cash, cash equivalents, and restricted cash used in operating activities    
Depreciation and amortization 1,420 785
(Accretion) amortization of lease right-of-use assets (98) 760
Share-based compensation expense 2,640 2,281
Change in fair value of warrant liability, net   (61)
Provision for doubtful accounts 129 198
Accrued interest, amortization of debt issuance costs and other 1,064 1,357
Inventory excess and obsolescence 8 30
Impairment loss on intangible assets 68 20
Changes in operating assets and liabilities:    
Accounts receivable (2,344) (33)
Other current assets (425) 544
Other long-term assets (22) (10)
Accounts payable and other accrued liabilities (1,234) (2,031)
Deferred revenue (37) 129
Contingent consideration (3,409)  
Tenant improvement allowances received   7,248
Current and long-term operating lease liabilities 543 (201)
Net cash and cash equivalents and restricted cash used in operating activities (15,311) (7,686)
Cash flows from investing activities    
Purchase of property and equipment (234) (7,676)
Patent costs and intangible asset acquisition, net (39) (30)
Net cash and cash equivalents and restricted cash used in investing activities (273) (7,706)
Cash flows from financing activities    
Proceeds from the issuance of common stock 625  
Proceeds from issuance of common stock under employee stock purchase plan 282 420
Proceeds from exercise of stock options 3 6
Payment of contingent consideration   (2,000)
Repayment of term loan and notes payable (13) (12)
Payment of debt issuance costs (18) (801)
Equity financing costs (18)  
Other (70) (34)
Net cash and cash equivalents and restricted cash provided by (used in) financing activities 791 (2,421)
Net decrease in cash and cash equivalents and restricted cash (14,793) (17,813)
Cash, cash equivalents, and restricted cash ‑ beginning of period 26,371 43,174
Cash, cash equivalents, and restricted cash ‑ end of period 11,578 25,361
Supplemental cash flow information:    
Debt issuance costs included in accounts payable and other accrued liabilities 13  
Equity financing costs included in accounts payable and other accrued liabilities 305 61
Operating lease right-of-use asset obtained in exchange for lease liabilities 338 43
Finance lease right-of-use assets obtained in exchange for lease liabilities   329
Cash paid for interest 1,475 $ 1,032
Purchases of property & equipment included in accounts payable and accrued liabilities $ 1,405