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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net (loss) $ (43) $ (18)
Adjustments to reconcile net (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 71 73
Stock-based compensation expense 5 19
Amortization of right-of-use assets 60 50
Gain on forgiveness of PPP loan (186) 0
Changes in operating assets and liabilities:    
Accounts receivable 143 11
Inventories (20) 101
Prepaid expenses and other assets 55 60
Accounts payable 53 45
Accrued liabilities (48) (20)
Accrued income taxes (6) 7
Deferred taxes (20) 0
Lease liabilities (65) (52)
Deferred revenue 0 (13)
Net cash provided by (used in) operating activities (1) 263
Cash flows from investing activities:    
Property, plant and equipment (12) 0
Intangible assets 0 (34)
Net cash used in investing activities (12) (34)
Cash flows from financing activities:    
Net cash provided by financing activities 0 0
Effect of exchange rate changes on cash, cash equivalents and restricted cash (9) (20)
Net increase (decrease) in cash and cash equivalents (22) 209
Cash, cash equivalents and restricted cash, beginning of period 6,125 5,844
Cash, cash equivalents and restricted cash, end of period 6,103 6,053
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Cash, cash equivalents and restricted cash, end of period 6,103 6,053
Supplemental disclosure of cash flow information:    
Income taxes paid 6 0
Interest paid $ 0 $ 0