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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (10,770) $ (10,919)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 755 1,529
Depreciation and amortization 444 247
Net noncash lease expense 30 21
Inventory reserve charge 65
Increase in provision for bad debts 28
Changes in operating assets and liabilities:    
Accounts receivable, net 135 (137)
Inventories (71) 289
Prepaid expenses and other current assets 723 823
Accounts payable 155 1,115
Accrued expenses and other current liabilities (631) (963)
Operating lease liabilities (35) (29)
Net cash used in operating activities (9,172) (8,024)
Cash flows from investing activities:    
Purchase of equipment (91)
Net cash used in investing activities (91)
Cash flows from financing activities:    
Net cash provided by financing activities
Effect of changes in exchange rates on cash and cash equivalents (7) (85)
Net decrease in cash and cash equivalents and restricted cash (9,270) (8,109)
Cash and cash equivalents and restricted cash – beginning of period 17,962 34,689
Cash and cash equivalents and restricted cash – end of period 8,692 26,580
Supplemental cash flows disclosures:    
Proceeds from sale of state net operating losses 211 445
Interest paid $ 4 $ 4