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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (3,360) $ (7,688)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 458 553
Amortization of debt discount and debt issuance costs 37 42
Non-cash interest expense 68 137
Loss on disposal of assets 36 55
Non-cash lease expense 214 234
Stock-based compensation 553 986
Changes in assets and liabilities:    
Accounts receivable, net (4,350) (3,226)
Prepaid expenses and other current assets 565 (86)
Other assets 54 (79)
Operating lease liabilities (235) (250)
Accounts payable (1,649) (1,320)
Accrued and other current liabilities (1,431) 893
Net cash used in operating activities (9,040) (9,749)
Cash flows from investing activities:    
Purchases of property and equipment (86) (396)
Net cash used in investing activities (86) (396)
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 (139) (189)
Principal payment on note payable obligations (65) (52)
Net cash used in financing activities (100) (62)
Net change in cash, cash equivalents and restricted cash (9,226) (10,207)
Cash, cash equivalents and restricted cash, beginning of period 36,693 62,591
Cash, cash equivalents and restricted cash, end of period 27,467 52,384
Supplemental disclosure of cash flow information:    
Cash paid for interest 434 449
Supplemental disclosure of non-cash items:    
Equipment purchased under notes payable obligations 0 250
Costs incurred, but not paid, in connection with capital expenditures $ 6 $ 199