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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (5,867) $ (5,582)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 572 777
Depreciation and amortization 122 106
Net noncash lease expense 15 13
Inventory reserve charge 75
Changes in operating assets and liabilities:    
Accounts receivable, net 188 75
Inventories (51) 399
Prepaid expenses and other current assets 303 252
Accounts payable (128) 692
Accrued expenses and other current liabilities (1,072) (1,497)
Operating lease liabilities (17) (15)
Net cash used in operating activities (5,860) (4,780)
Cash flows from investing activities:    
Net cash provided by investing activities
Cash flows from financing activities:    
Net cash provided by financing activities
Effect of changes in exchange rates on cash and cash equivalents 56 (27)
Net decrease in cash and cash equivalents and restricted cash (5,804) (4,807)
Cash and cash equivalents and restricted cash – beginning of period 17,962 34,689
Cash and cash equivalents and restricted cash – end of period 12,158 29,882
Supplemental cash flows disclosures:    
Proceeds from sale of state net operating losses 211
Interest paid $ 2 $ 2