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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (5,044) $ (6,423)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,682 1,449
Amortization of right-of-use assets 417 419
Stock-based compensation expense 55 177
Provision for doubtful accounts, net 82 78
Change of inventory to net realizable value 937 537
Changes in operating assets and liabilities:    
Receivables (1,319) 368
Inventories 2,667 2,812
Prepaid expenses and other assets (985) (4,186)
Accounts payable 1,484 (1,994)
Accrued liabilities 179 863
Income taxes payable 359
Deferred product revenue (14) (56)
Operating lease liabilities (421) (973)
Other long-term liabilities (29)
Net cash used in operating activities (309) (6,570)
Cash flows from investing activities:    
Purchase of property and equipment (266) (106)
Purchase of intangibles (140) (43)
Capitalized patent defense costs (5,565) (3,371)
Proceeds from maturities and sales of marketable securities 3,697 9,823
Purchases of marketable securities (2,155) (8,913)
Net cash used in investing activities (4,429) (2,610)
Cash flows from financing activities:    
Issuance of common stock and warrants 4,764
Net proceeds from Paycheck Protection Program loan 1,499
Net proceeds from equity-based compensation programs 11 20
Net cash provided by financing activities 6,274 20
Effect of exchange rate changes on cash and cash equivalents (17) (41)
Net increase (decrease) in cash and cash equivalents 1,519 (9,201)
Cash and cash equivalents at the beginning of the period 4,064 11,211
Cash and cash equivalents at the end of the period 5,583 2,010
Supplemental cash flow activities:    
Cash paid for income taxes 23 1
Cash paid for interest $ 189