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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income (loss) $ (10,564) $ 3,532
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,172 1,408
Impairment of goodwill and intangible assets 13,460
Amortization of deferred rent (53) (57)
Stock-based compensation expense 514 494
Provision for (recovery of) doubtful accounts, net 106 (6)
Write-down of inventory to net realizable value 458
Loss on disposal of assets 1 54
Tax benefit from exercise of stock options (721)
Deferred income taxes (5,221) 107
Changes in operating assets and liabilities:    
Receivables (649) 234
Inventories (8,964) 1,353
Prepaid expenses and other assets (226) (147)
Accounts payable 2,257 770
Accrued liabilities (67) (134)
Income taxes payable 699 429
Deferred product revenue (23) (284)
Other long-term liabilities (61) (51)
Net cash provided by (used in) operating activities (7,619) 7,439
Cash flows from investing activities:    
Purchase of property and equipment (537) (544)
Purchase of intangibles (203)
Proceeds from maturities and sales of marketable securities 9,946 5,371
Purchase of marketable securities (3,915) (6,608)
Capitalized patent defense costs (845)
Net cash provided by (used in) investing activities 4,446 (1,781)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 117 736
Tax benefit from equity-based compensation programs 721
Repurchase and cancellation of stock options (285) (1,752)
Dividend payments (1,650) (1,373)
Repurchase and cancellation of stock (4,151) (5,139)
Net cash used in financing activities (5,969) (6,807)
Effect of exchange rate changes on cash and cash equivalents 55 10
Net decrease in cash and cash equivalents (9,087) (1,139)
Cash and cash equivalents at the beginning of the period 12,100 13,412
Cash and cash equivalents at the end of the period 3,013 12,273
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 6 $ 893