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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (11,354) $ (18,116)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,309 1,661
Amortization of debt discount and debt issuance costs 112 119
Non-cash interest expense 206 294
Loss on disposal of assets 111 209
Non-cash lease expense 656 717
Stock-based compensation 1,330 2,854
Changes in assets and liabilities:    
Accounts receivable, net (2,836) (10,967)
Prepaid expenses and other current assets 662 727
Other assets 50 (120)
Operating lease liabilities (720) (767)
Accounts payable (2,028) (1,422)
Accrued and other current liabilities (1,140) 2,000
Net cash used in operating activities (13,642) (22,811)
Cash flows from investing activities:    
Purchases of property and equipment (369) (722)
Proceeds from disposal of property and equipment 0 2
Net cash used in investing activities (369) (720)
Cash flows from financing activities:    
Proceeds from exercise of stock options 22 27
Proceeds from common stock issued under Employee Stock Purchase Plan 176 279
Principal payments on finance lease obligations (379) (541)
Principal payment on note payable obligations (266) (177)
Principal payment on long-term debt 0 (10,000)
Net cash used in financing activities (447) (10,412)
Net change in cash, cash equivalents and restricted cash (14,458) (33,943)
Cash, cash equivalents and restricted cash, beginning of period 36,693 62,591
Cash, cash equivalents and restricted cash, end of period 22,235 28,648
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,307 1,336
Supplemental disclosure of non-cash items:    
Equipment purchased under notes payable obligations 706 250
Costs incurred, but not paid, in connection with capital expenditures $ 20 $ 81