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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net income (loss) $ (9,547) $ 469
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Amortization of debt discount 573 381
Amortization of patents 123 124
Depreciation and amortization 576 649
Amortization of right-of-use asset 53 72
Loss on abandoned patents 338  
Write-off of inventory   253
Bad debt expense (recovery) 240 9
Stock-based compensation 912 1,391
Foreign currency transaction (gains) losses 2,139 (9,192)
Changes in operating assets and liabilities    
Accounts receivable 377 257
Inventories 1,512 (925)
Prepaid expenses and other current assets 645 1,897
Other assets 1  
Accounts payable and accrued expenses 313 (360)
Net cash used in operating activities (1,745) (4,975)
Cash flows from investing activities    
Purchases of property and equipment (25) (39)
Disposals of property and equipment 85  
Payments for patent costs (99) (140)
Net cash used in investing activities (39) (179)
Cash flows from financing activities    
Cash for exercise of warrants, net   1,439
Proceeds from rights offering, net   5,392
Net cash provided by financing activities   6,831
Effect of exchange rates on cash (52) 285
Net change in cash, cash equivalents, and restricted cash (1,836) 1,962
Cash, cash equivalents, and restricted cash as of beginning of period 7,771 9,764
Cash, cash equivalents, and restricted cash as of end of period 5,935 11,726
Supplemental disclosure of cash flow information    
Cash paid for interest $ 1,215 1,018
Supplemental disclosure of non-cash financing activities    
Fair value of common stock warrants issued in connection with the rights offering   $ 556