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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 $ (7,120) $ (5,113)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 103 180
Non-cash interest expense 34 42
Changes in operating assets and liabilities:    
Income tax receivable (140) 0
Prepaid expenses and other current assets (912) (2,108)
Other non-current assets 0 (5,441)
Accounts payable (957) 4,644
Accrued liabilities (400) (1,955)
Net cash used in operating activities (9,392) (9,751)
Cash flows from financing activities:    
Proceeds from public offering of common stock and warrants net of underwriters discount and offering costs of $926 and $1,302 respectively 8,082 15,358
Cash paid for fractional shares 0 (4)
Principal payments on notes (1,000) (1,650)
Net cash provided by financing activities 7,082 13,704
Effect of exchange rate changes on cash (6) (3)
Net change in cash (2,316) 3,950
Cash and cash equivalents at beginning of period 2,578 1,285
Cash and cash equivalents at end of period 262 5,235
Supplemental disclosure of cash flow information:    
Cash paid during period for interest 266 386
Supplemental disclosure of non-cash transactions:    
Cashless exercise of warrants $ 0 $ (8)