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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (14,151) $ (10,564)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,169 1,172
Impairment of goodwill and intangible assets 13,460
Amortization of deferred rent (29) (53)
Stock-based compensation expense 379 514
Provision for doubtful accounts, net 112 106
Change of inventory to net realizable value 471 0
Loss on disposal of assets 1
Deferred income taxes 6,531 (5,221)
Changes in operating assets and liabilities:    
Receivables 2,458 (649)
Inventories 1,087 (8,964)
Prepaid expenses and other assets (369) (226)
Accounts payable (758) 2,257
Accrued liabilities (112) (67)
Income taxes payable (364) 699
Deferred product revenue (44) (23)
Other long-term liabilities 39 (61)
Net cash used in operating activities (3,581) (7,619)
Cash flows from investing activities:    
Purchase of property and equipment (281) (537)
Purchase of intangibles (94) (203)
Capitalized patent defense costs (3,573) (845)
Proceeds from maturities and sales of marketable securities 7,502 9,946
Purchases of marketable securities (2,284) (3,915)
Net cash provided by investing activities 1,270 4,446
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 32 117
Dividend payments (583) (1,650)
Repurchase and cancellation of stock options (285)
Repurchase and cancellation of stock (147) (4,151)
Net cash used in financing activities (698) (5,969)
Effect of exchange rate changes on cash and cash equivalents (40) 55
Net decrease in cash and cash equivalents (3,049) (9,087)
Cash and cash equivalents at the beginning of the period 5,571 12,100
Cash and cash equivalents at the end of the period 2,522 3,013
Cash paid for income taxes $ 11 $ 6