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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:    
Net loss $ (15,115) $ (23,689)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,724 2,168
Amortization of debt discount and debt issuance costs 154 156
Non-cash interest expense 276 363
Loss on disposal of assets 111 189
Loss on lease assignment 0 1,470
Non-cash lease expense 884 939
Stock-based compensation 1,763 3,617
Changes in assets and liabilities:    
Accounts receivable, net (1,284) (474)
Prepaid expenses and other current assets (1,787) (654)
Other assets 63 (101)
Operating lease liabilities (976) (1,010)
Accounts payable 308 67
Accrued and other current liabilities 600 2,497
Net cash used in operating activities (13,279) (14,462)
Cash flows from investing activities:    
Purchases of property and equipment (515) (828)
Proceeds from disposal of property and equipment 0 24
Net cash used in investing activities (515) (804)
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 payment on finance lease obligations (490) (697)
Principal payment on note payable obligations (371) (241)
Principal payment on long-term debt 0 (10,000)
Net cash used in financing activities (663) (10,632)
Net change in cash, cash equivalents and restricted cash (14,457) (25,898)
Cash, cash equivalents and restricted cash, beginning of year 36,693 62,591
Cash, cash equivalents and restricted cash, end of year 22,236 36,693
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,719 1,737
Supplemental disclosure of non-cash items:    
Equipment purchased under notes payable obligations 706 250
Costs incurred, but not paid, in connection with capital expenditures $ 717 $ 66