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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (11,375) $ (3,609)
Adjustments to reconcile net loss to net cash, restricted cash, and cash equivalents (used in) provided by operating activities:    
Depreciation 182 185
Amortization of right-of-use asset 123 118
Provision for product warranties 134 138
Stock-based compensation 140 146
Deferred income taxes 4,079 (613)
Changes in operating assets and liabilities:    
Accounts receivable 4,361 7,109
Inventories (4,839) (3,176)
Prepaid inventory 915 666
Other current assets (62) (842)
Other noncurrent assets 135 117
Accounts payable and accrued expenses (176) 554
Operating lease liability (128) (118)
Deferred revenue (233) (35)
Product warranties (142) (200)
Net cash (used in) provided by operating activities (6,886) 440
Cash flows from investing activities    
Acquisition of property and equipment (11) (34)
Net cash used in investing activities (11) (34)
Cash flows from financing activities    
Repurchase of common stock (300)
Net cash used in financing activities (300)
Net (decrease) increase in cash, restricted cash, and cash equivalents (6,897) 106
Cash, restricted cash, and cash equivalents – beginning of period 22,083 22,056
Cash, restricted cash, and cash equivalents – end of period 15,186 22,162
Supplemental disclosure of cash flow information:    
Interest paid
Income tax paid 8 979
Supplemental schedule of noncash investing and financing transactions:    
Transfer of inventory to property and equipment 943 868
Lease liability arising from obtaining right-of-use-assets $ 111