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Unaudited 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 $ (1,655) $ (1,847)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 661 522
Amortization of right-of-use assets 149 143
Stock-based compensation expense 31 37
Provision for doubtful accounts, net 15
Change of inventory to net realizable value 375 201
Changes in operating assets and liabilities:    
Receivables 264 878
Inventories 736 1,428
Prepaid expenses and other assets 265 110
Accounts payable (1,043) (396)
Accrued liabilities 446 (458)
Income taxes payable (43) 10
Deferred product revenue (45) 34
Operating lease liabilities (154) (146)
Other long-term liabilities
Net cash provided by (used in) operating activities (13) 531
Cash flows from investing activities:    
Purchase of property and equipment (7) (30)
Purchase of intangibles (71) (48)
Capitalized patent defense costs (1,678) (1,722)
Proceeds from maturities and sales of marketable securities 413 1,208
Purchases of marketable securities (310) (1,124)
Net cash used in investing activities (1,653) (1,716)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 4 3
Principal payments of long-term debt (90)
Net cash provided by (used in) financing activities (86) 3
Effect of exchange rate changes on cash and cash equivalents (17) (27)
Net decrease in cash and cash equivalents (1,769) (1,209)
Cash and cash equivalents at the beginning of the period 3,803 4,064
Cash and cash equivalents at the end of the period 2,034 2,855
Supplemental cash flow activities:    
Cash paid for income taxes 43 8
Cash paid for interest $ 50 $ 76