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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (3,241) $ (3,784)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,330 1,082
Amortization of right-of-use assets 291 273
Stock-based compensation expense 65 54
Provision for doubtful accounts, net 31
Change of inventory to net realizable value 682 660
Changes in operating assets and liabilities:    
Receivables (111) (358)
Inventories 1,189 2,331
Prepaid expenses and other assets 261 238
Accounts payable 96 302
Accrued liabilities 842 (443)
Income taxes payable (51) 6
Deferred product revenue (67) 26
Operating lease liabilities (301) (276)
Other long-term liabilities (29)
Net cash provided by (used in) operating activities 985 113
Cash flows from investing activities:    
Purchase of property and equipment (25) (218)
Purchase of intangibles (147) (114)
Capitalized patent defense costs (3,206) (3,792)
Proceeds from maturities and sales of marketable securities 1,394 2,482
Purchases of marketable securities (517) (1,903)
Net cash used in investing activities (2,501) (3,545)
Cash flows from financing activities:    
Net proceeds from Paycheck Protection Program loan 1,499
Net proceeds from equity-based compensation programs 7 6
Principal payments of long-term debt (180)
Net cash provided by (used in) financing activities (173) 1,505
Effect of exchange rate changes on cash and cash equivalents (26) (31)
Net decrease in cash and cash equivalents (1,715) (1,958)
Cash and cash equivalents at the beginning of the period 3,803 4,064
Cash and cash equivalents at the end of the period 2,088 2,106
Supplemental cash flow activities:    
Cash paid for income taxes 74 12
Cash paid for interest $ 106 $ 134