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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities    
Net loss $ (2,626) $ (2,572)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:    
Depreciation 96 86
Amortization of right-of-use assets 62 59
Provision for product warranties 78 45
Stock-based compensation 70 79
Deferred income taxes (1,607) 110
Changes in operating assets and liabilities:    
Accounts receivable 2,463 1,713
Inventories (2,368) (586)
Prepaid inventory (956) (2,303)
Other current assets (24) (26)
Other noncurrent assets 74 36
Accounts payable and accrued expenses 1,349 824
Operating lease liability (63) (59)
Deferred revenue (209) (3)
Product warranties (92) (80)
Net cash used in operating activities (3,753) (2,677)
Cash flows from investing activities    
Acquisition of property and equipment (3) (7)
Net cash used in investing activities (3) (7)
Cash flows from financing activities    
Repurchase of common stock (300)
Net cash used in financing activities (300)
Net decrease in cash and cash equivalents (3,756) (2,984)
Cash and cash equivalents – beginning of period 22,083 22,056
Cash and cash equivalents – end of period 18,327 19,072
Supplemental disclosure of cash flow information:    
Interest paid
Income tax paid
Income tax refunds received
Supplemental schedule of noncash investing and financing transactions:    
Net transfers from inventory to fixed assets 431 760
Lease liability arising from obtaining right-of-use-assets $ 111