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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (2,224) $ (3,241)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,593 1,330
Amortization of right-of-use assets 300 291
Share-based compensation expense 65 65
Change of inventory to net realizable value 27 682
Gain recognized on Paycheck Protection Plan Loan forgiveness (1,528) 0
Changes in operating assets and liabilities:    
Receivables 879 (111)
Inventories 730 1,189
Prepaid expenses and other assets 1,097 261
Accounts payable (3,341) 96
Accrued liabilities 33 842
Income taxes receivable 0 (51)
Deferred product revenue (11) (67)
Operating lease liabilities (312) (301)
Net cash provided by (used in) operating activities (2,692) 985
Cash flows from investing activities:    
Purchase of property and equipment (16) (25)
Purchase of intangibles (58) (147)
Capitalized patent defense costs (497) (3,206)
Proceeds from maturities and sales of marketable securities 3,008 1,394
Purchases of marketable securities 0 (517)
Net cash provided by (used in) investing activities 2,437 (2,501)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 2 7
Paycheck Protection Program loan refund upon full forgiveness net of loan payments 768 0
Principal payments of long-term debt (360) (180)
Net cash provided by (used in) financing activities 410 (173)
Effect of exchange rate changes on cash and cash equivalents (23) (26)
Net increase in cash and cash equivalents 132 (1,715)
Cash and cash equivalents at the beginning of the period 1,071 3,803
Cash and cash equivalents at the end of the period 1,203 2,088
Supplemental cash flow activities:    
Cash paid for income taxes 39 74
Cash paid for interest $ 97 $ 106