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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities    
Net loss $ (2,701) $ (13,152)
Adjustments to reconcile net loss to net cash used in operating activities:    
Accrued final fee   111
Amortization of debt discount 571 132
Amortization of loan costs   58
Depreciation and amortization 1,137 1,181
Amortization of right-of-use asset 109 138
Write-off of patent cost 176 313
Write-off of inventory 253  
Bad debt expense 17 107
Stock-based compensation 1,879 2,840
Foreign currency transaction gains (9,128) (680)
Changes in operating assets and liabilities    
Accounts receivable 560 (629)
Inventories (1,247) 153
Prepaid expenses and other current assets 989 505
Other assets   2
Accounts payable and accrued expenses (167) (3,166)
Net cash used in operating activities (7,552) (12,087)
Cash flows from investing activities    
Purchases of property and equipment (56) (215)
Payments for patent costs (68) (330)
Net cash used in investing activities (124) (545)
Cash flows from financing activities    
Proceeds from long-term debt   15,000
Repayment of long-term debt   (5,000)
Payment of final fee   (150)
Payment of loan costs   (698)
Equity contributions - net of fees incurred   12
Proceeds from exercise of common stock warrants 1,439  
Proceeds from rights offering, net of fees incurred 5,392  
Net cash provided by financing activities 6,831 9,164
Effect of exchange rates on cash 139 21
Net change in cash, cash equivalents, and restricted cash (706) (3,447)
Cash, cash equivalents, and restricted cash at beginning of year 9,764 15,615
Cash, cash equivalents, and restricted cash - end of period 9,058 12,168
Supplemental disclosure of cash flow information    
Cash paid for interest $ 1,535 772
Supplemental disclosure of non-cash financing activities    
Warrants issued in connection with long-term debt   $ 691