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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash Flows from Operating Activities:    
Net loss $ (8,221) $ (8,795)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 251 230
Loss on the sale of fixed assets 0 74
Non-cash stock compensation expense 1,043 733
Non-cash lease expense 65 57
Non-cash interest expense 30 26
Change in fair value of warrant liability (7) (724)
Accretion of debt discount 83 75
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (39) (730)
Other assets 14  
Accounts payable 50 149
Accrued expenses (1,584) (1,790)
Deferred income 0 (12)
Lease liability (123) (112)
Net cash used in operating activities (8,438) (10,819)
Cash Flows from Investing Activities:    
Purchase of fixed assets (7) (138)
Proceeds from the sale of fixed assets 0 157
Net cash (used in) provided by investing activities (7) 19
Cash Flows from Financing Activities:    
Proceeds from option exercises 226  
Principal payments on term loan (1,667)  
Net cash used in financing activities (1,255) 0
Net decrease in cash (9,700) (10,800)
Cash, cash equivalents and restricted cash at beginning of period 35,679 70,324
Cash, cash equivalents and restricted cash at end of period 25,979 59,524
Supplemental cash flow information:    
Cash paid for interest 549 500
Supplemental disclosures of non-cash information:    
Capital expenditures in accounts payable and accrued expenses 0 $ 66
At The Market Offerings    
Cash Flows from Financing Activities:    
Proceeds from sale of common stock, net of issuance costs $ 186