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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash Flows from Operating Activities:    
Net loss $ (41,104) $ (26,844)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 745 711
Impairment of fixed assets 0 162
Loss on the sale of fixed assets 0 77
Non-cash stock compensation expense 4,068 2,152
Non-cash lease expense 202 177
Non-cash interest expense 89 77
Change in fair value of warrant liability 14,970 (1,449)
Accretion of debt discount 218 237
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (143) (230)
Other assets 41 (139)
Accounts payable (129) (127)
Accrued expenses 213 (1,247)
Deferred income 0 (36)
Lease liability (379) (343)
Net cash used in operating activities (21,209) (26,822)
Cash Flows from Investing Activities:    
Purchase of fixed assets (13) (410)
Proceeds from the sale of fixed assets 0 157
Net cash used in investing activities (13) (253)
Cash Flows from Financing Activities:    
Proceeds from option exercises 1,319  
Principal payments on term loan (6,667)  
Net cash provided by financing activities 2,367 0
Net decrease in cash (18,855) (27,075)
Cash, cash equivalents and restricted cash at beginning of period 35,679 70,324
Cash, cash equivalents and restricted cash at end of period 16,824 43,249
Supplemental cash flow information:    
Cash paid for interest 1,462 1,592
Supplemental disclosures of non-cash information:    
Capital expenditures in accounts payable and accrued expenses 3 $ 19
At The Market Offerings    
Cash Flows from Financing Activities:    
Proceeds from sale of common stock, net of issuance costs $ 7,715