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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (6,423) $ (14,151)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,449 1,169
Amortization of right-of-use assets 419
Amortization of deferred rent (29)
Stock-based compensation expense 177 379
Provision for doubtful accounts, net 78 112
Change of inventory to net realizable value 537 471
Deferred income taxes 6,531
Changes in operating assets and liabilities:    
Receivables 368 2,458
Inventories 2,812 1,087
Prepaid expenses and other assets (4,186) (369)
Accounts payable (1,994) (758)
Accrued liabilities 863 (112)
Income taxes payable 359 (364)
Deferred product revenue (56) (44)
Operating lease liabilities (973)
Other long-term liabilities 39
Net cash used in operating activities (6,570) (3,581)
Cash flows from investing activities:    
Purchase of property and equipment (106) (281)
Purchase of intangibles (43) (94)
Capitalized patent defense costs (3,371) (3,573)
Proceeds from maturities and sales of marketable securities 9,823 7,502
Purchases of marketable securities (8,913) (2,284)
Net cash provided by (used in) investing activities (2,610) 1,270
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 20 32
Dividend payments (583)
Repurchase and cancellation of stock (147)
Net cash provided by (used in) financing activities 20 (698)
Effect of exchange rate changes on cash and cash equivalents (41) (40)
Net decrease in cash and cash equivalents (9,201) (3,049)
Cash and cash equivalents at the beginning of the period 11,211 5,571
Cash and cash equivalents at the end of the period 2,010 2,522
Cash paid for income taxes $ 1 $ 11