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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (5,410) $ (5,044)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 2,042 1,682
Amortization of right-of-use assets 458 417
Share-based compensation expense 100 55
Provision for doubtful accounts, net (1) 82
Change of inventory to net realizable value 798 937
Changes in operating assets and liabilities:    
Receivables (48) (1,319)
Inventories 1,724 2,667
Prepaid expenses and other assets (973) (985)
Accounts payable 65 1,484
Accrued liabilities 360 179
Income taxes receivable (52)
Deferred product revenue (66) (14)
Operating lease liabilities (474) (421)
Other long-term liabilities (29)
Net cash used in operating activities (1,477) (309)
Cash flows from investing activities:    
Purchase of property and equipment (39) (266)
Purchase of intangibles (220) (140)
Capitalized patent defense costs (5,348) (5,565)
Proceeds from maturities and sales of marketable securities 1,971 3,697
Purchases of marketable securities (526) (2,155)
Net cash used in investing activities (4,162) (4,429)
Cash flows from financing activities:    
Net proceeds from issuance of common stock and warrants 9,288 4,764
Proceeds from issuance of short-term notes 2,000
Net proceeds from Paycheck Protection Program loan 1,499
Net proceeds from equity-based compensation programs 12 11
Principal payments of long-term debt (270)
Net cash provided by financing activities 11,030 6,274
Effect of exchange rate changes on cash and cash equivalents (33) (17)
Net increase in cash and cash equivalents 5,358 1,519
Cash and cash equivalents at the beginning of the period 3,803 4,064
Cash and cash equivalents at the end of the period 9,161 5,583
Supplemental cash flow activities:    
Cash paid for income taxes 91 23
Cash paid for interest $ 200 $ 189