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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net loss $ (3,752) $ (3,360)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 440 458
Amortization of debt discount and debt issuance costs 42 37
Non-cash interest expense 68 68
Loss on disposal of assets 6 36
Non-cash lease expense 234 214
Stock-based compensation 417 553
Changes in assets and liabilities:    
Accounts receivable, net (6,893) (4,350)
Prepaid expenses and other current assets 2 565
Other assets 72 54
Operating lease liabilities (263) (235)
Accounts payable 231 (1,649)
Deferred revenue 143 0
Accrued and other current liabilities (1,418) (1,431)
Net cash used in operating activities (10,671) (9,040)
Cash flows from investing activities:    
Purchases of property and equipment (113) (86)
Proceeds from disposal of property and equipment 6 0
Net cash used in investing activities (107) (86)
Cash flows from financing activities:    
Proceeds from common stock issued under Employee Stock Purchase Plan 198 104
Principal payments on finance lease obligations (90) (139)
Principal payments on notes payable obligations (107) (65)
Payment of deferred financing costs (65) 0
Net cash used in financing activities (64) (100)
Net decrease in cash, cash equivalents and restricted cash (10,842) (9,226)
Cash, cash equivalents and restricted cash, beginning of period 22,236 36,693
Cash, cash equivalents and restricted cash, end of period 11,394 27,467
Supplemental disclosure of cash flow information:    
Cash paid for interest 402 434
Supplemental disclosure of non-cash items:    
Unpaid equipment settled under financing arrangement 677 0
Costs incurred, but not paid, in connection with capital expenditures $ 176 $ 6