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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating Activities    
Net (loss) income $ (998) $ 398
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation 94 168
Amortization 14 34
Loss on disposal of equipment 0 2
Provision for doubtful accounts, net of recoveries (25) 47
Stock-based compensation, net of forfeitures 18 20
Changes in operating assets and liabilities:    
Accounts receivable (1,520) 1,831
Inventories (13) (59)
Prepaid expenses, other current assets and other non-current assets (3) 422
Accounts payable 682 (874)
Accrued liabilities and other non-current liabilities 5 (658)
Net cash used in operating activities (1,746) (225)
Investing Activities    
Purchases of equipment and patents (53) (4)
Net cash used in investing activities (53) (4)
Financing Activities    
Proceeds from sale of common stock issued in connection with private placement 0 25,812
Costs related to sale of common stock issued in connection with private placement 0 (1,783)
Taxes paid on behalf of equity award participants (17) (52)
Net cash (used in) provided by financing activities (17) 23,977
Effect of exchange rate fluctuations on cash 2 (223)
Net (decrease) increase in cash, cash equivalents and restricted cash (1,814) 23,525
Cash, cash equivalents, and restricted cash at beginning of period (Note 2) 37,054 12,606
Cash, cash equivalents and restricted cash at end of period (Note 2) 35,240 36,131
Paycheck Protection Program CARES Act [Member]    
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Gain of forgiveness on Paycheck Protection Plan Loan $ 0 $ (1,556)