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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (1,967) $ (1,655)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 794 661
Amortization of right-of-use assets 154 149
Share-based compensation expense 36 31
Change of inventory to net realizable value 0 375
Changes in operating assets and liabilities:    
Receivables (86) 264
Inventories 525 736
Prepaid expenses and other assets 651 265
Accounts payable (1,263) (1,043)
Accrued liabilities 286 446
Income taxes receivable (5) (43)
Deferred product revenue (8) (45)
Operating lease liabilities (160) (154)
Net cash used in operating activities (1,043) (13)
Cash flows from investing activities:    
Purchase of property and equipment (8) (7)
Purchase of intangibles (70) (71)
Capitalized patent defense costs (189) (1,678)
Proceeds from maturities and sales of marketable securities 2,042 413
Purchases of marketable securities 0 (310)
Net cash provided by (used in) investing activities 1,775 (1,653)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 2 4
Principal payments of long-term debt (370) (90)
Net cash provided by financing activities (368) (86)
Effect of exchange rate changes on cash and cash equivalents (13) (17)
Net increase in cash and cash equivalents 351 (1,769)
Cash and cash equivalents at the beginning of the period 1,071 3,803
Cash and cash equivalents at the end of the period 1,422 2,034
Supplemental cash flow activities:    
Cash paid for income taxes 26 43
Cash paid for interest $ 51 $ 50