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CONSOLIDATED STATEMENT OF CASH FLOWS (in thousands) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (333) $ (554)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 200 197
Equipment transferred to cost of goods sold 132 (2)
Share-based compensation 278 249
Net change in:    
Trade accounts receivable (843) 973
Inventories 442 189
Other current assets 36 (792)
Accounts payable and accrued liabilities (94) (468)
Deferred revenue 175 24
Other long-term liabilities (105) (135)
Deposits and other long-term assets 136 771
Net cash provided by (used in) operating activities 24 452
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (92) (340)
Cash provided by (used in) investing activities (92) (340)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Net proceeds from issuance of common stock, less payments for shares withheld to cover tax 12 4
Cash provided by (used in) financing activities 12 4
Increase (decrease) in cash and cash equivalents (56) 116
Effects of exchange rate changes on cash (490) (238)
Cash and cash equivalents at beginning of period 14,167 13,936
Cash and cash equivalents at end of period 13,621 13,814
Supplemental disclosure of cash flow information:    
Cash paid during the period for: income taxes $ 40 $ 63