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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (48,027) $ (62,535)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 5,155 6,381
Stock-based compensation 9,705 8,727
Change in fair value of earn-out liabilities (514) 2,362
Change in fair value of derivative warrant liabilities (717) 4,320
Change in fair value of forward contract 0 2,229
Impairment of deferred offering costs 0 836
Accretion of available-for-sale securities (2,752) (2,310)
Amortization of debt issuance costs, commitment fees and accretion of debt end-of-term liabilities 741 1,100
Non-cash lease expense 1,533 1,288
Changes in operating assets and liabilities:    
Accounts receivable (1,355) 3,239
Prepaid expenses, other current assets and other assets (1,955) (1,027)
Deferred revenue 543 (489)
Accounts payable (808) (212)
Accrued expenses and operating lease liabilities (3,632) (2,067)
Net cash used in operating activities (42,083) (38,158)
Cash flows from investing activities:    
Purchases of property and equipment (9,816) (7,511)
Purchases of available-for-sale securities (98,451) (79,047)
Maturities of available-for-sale securities 107,499 98,082
Net cash (used in) provided by investing activities (768) 11,524
Cash flows from financing activities:    
Payments of principal of notes payable (9,491) (5,405)
Proceeds from sale of common stock from sales through Common Stock Purchase Agreement 12,838 15,051
Proceeds from sale of common stock from sales through At-The-Market (ATM) Offering 38,831 0
Payments of offering costs (476) (107)
Proceeds from issuance of common stock upon exercise of stock options and warrants 83 1,002
Net cash provided by financing activities 41,785 10,541
Effects of exchange rate changes on cash and cash equivalents (40) (38)
Net decrease in cash and cash equivalents (1,106) (16,131)
Cash and cash equivalents - beginning of period 21,392 57,888
Cash and cash equivalents - end of period 20,286 41,757
Supplemental disclosures of other cash flow information:    
Cash paid for interest 2,057 3,299
Non-cash investing and financing activities:    
Capitalization of deferred costs to equity upon share issuance 190 13
Purchases of property and equipment recorded in accounts payable 252 394
Purchases of property and equipment recorded in accrued expenses 76 605
Non-cash addition to operating lease right-of-use assets and lease liability 2,268 0
Unrealized gain on short term investments $ 54 $ 273