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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (18,116) $ (33,033)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,661 1,037
Amortization of debt discount and debt issuance costs 119 119
Non-cash interest expense 294 411
Loss on disposal of assets 209 0
Non-cash lease expense 717 738
Stock-based compensation 2,854 4,122
Other 0 33
Changes in assets and liabilities:    
Accounts receivable, net (10,967) (985)
Prepaid expenses and other current assets 727 921
Other assets (120) (100)
Operating lease liabilities (767) (613)
Accounts payable (1,422) 1,061
Accrued and other current liabilities 2,000 (121)
Net cash used in operating activities (22,811) (26,410)
Cash flows from investing activities:    
Purchases of property and equipment (722) (3,912)
Proceeds from disposal of property and equipment 2 0
Net cash used in investing activities (720) (3,912)
Cash flows from financing activities:    
Proceeds from exercise of stock options 27 0
Payments of taxes withheld on vested restricted stock units 0 (224)
Proceeds from common stock issued under Employee Stock Purchase Plan 279 385
Principal payments on finance lease obligations (541) (477)
Principal payment on note payable obligations (177) 0
Principal payment on long-term debt (10,000) 0
Net cash used in financing activities (10,412) (316)
Net change in cash, cash equivalents and restricted cash (33,943) (30,638)
Cash, cash equivalents and restricted cash, beginning of period 62,591 99,542
Cash, cash equivalents and restricted cash, end of period 28,648 68,904
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,336 1,297
Supplemental disclosure of non-cash items:    
Equipment purchased under finance lease obligations 0 709
Equipment purchased under notes payable obligations 250 0
Costs incurred, but not paid, in connection with capital expenditures $ 81 $ 645