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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (2,300) $ (6,456)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 129 1,983
Stock-based compensation 266 2,377
Change in fair value of warrant liabilities (6) (1,645)
Shares issued for services 40
Other (13) (7)
Changes in assets and liabilities    
Accounts receivable (310) (729)
Inventories 783
Prepaid expenses and other assets (526) (187)
Accounts payable 242 (130)
Right-of-use assets 73 174
Lease liabilities - operating (43) (144)
Deferred revenue, accrued expenses and other (1,342) 1,555
Net cash used in operating activities (3,007) (3,209)
Cash flows from investing activities:    
Purchases of property and equipment (45)
Net cash used in investing activities (45)
Cash flows from financing activities:    
Proceeds from sale of common stock and warrants, net 3,559
Proceeds from at-the-market sales of stock, net 1,512
Proceeds from option exercises 4
Taxes paid to net share settle equity awards (4)
Repayment of financing leases (47) (61)
Net cash provided by financing activities 1,469 3,494
Net increase (decrease) in cash and cash equivalents (1,583) 285
Cash and cash equivalents at beginning of period 3,344 1,583
Cash and cash equivalents at end of period $ 1,761 $ 1,868