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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (6,326) $ (12,701)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 887 1,056
Amortization of debt discount and debt issuance costs 78 80
Non-cash interest expense 137 226
Loss on disposal of assets 111 129
Non-cash lease expense 433 473
Stock-based compensation 1,113 1,964
Changes in assets and liabilities:    
Accounts receivable, net (5,152) (10,158)
Prepaid expenses and other current assets 185 573
Other assets 102 (101)
Operating lease liabilities (475) (506)
Accounts payable (820) (1,750)
Accrued and other current liabilities (1,739) 812
Net cash used in operating activities (11,466) (19,903)
Cash flows from investing activities:    
Purchases of property and equipment (222) (720)
Proceeds from disposal of property and equipment 0 2
Net cash used in investing activities (222) (718)
Cash flows from financing activities:    
Proceeds from exercise of stock options 0 27
Proceeds from common stock issued under Employee Stock Purchase Plan 104 152
Principal payments on finance lease obligations (267) (369)
Principal payment on note payable obligations (163) (114)
Principal payment on long-term debt 0 (10,000)
Net cash used in financing activities (326) (10,304)
Net change in cash, cash equivalents and restricted cash (12,014) (30,925)
Cash, cash equivalents and restricted cash, beginning of period 36,693 62,591
Cash, cash equivalents and restricted cash, end of period 24,679 31,666
Supplemental disclosure of cash flow information:    
Cash paid for interest 871 898
Supplemental disclosure of non-cash items:    
Equipment purchased under notes payable obligations 706 250
Costs incurred, but not paid, in connection with capital expenditures $ 39 $ 61