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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ (14,172) $ 2,444 $ 6,776
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 1,531 1,873 2,058
Impairment of goodwill and intangible assets 13,493
Amortization of deferred rent 44 73 95
Stock-based compensation expense 665 667 848
Provision for (recoveries of) doubtful accounts, net 252 132 (4)
Write-down of inventory to net realizable value 649 653 496
Loss on disposal of assets 7 54 7
Tax benefit from exercise of stock options (690) (41)
Deferred income taxes (1,877) 439 (4)
Changes in operating assets and liabilities:      
Receivables (526) 1,085 1,201
Inventories (10,756) 1,869 (2,249)
Prepaid expenses and other assets 9 (209) 824
Accounts payable 572 733 (242)
Accrued liabilities (23) (319) (1,219)
Income taxes payable 853 (207) 323
Deferred product revenue 740 (665) (447)
Other long-term liabilities (644) 48 (638)
Net cash provided/(used) by operating activities (9,271) 7,834 7,594
Cash flows from investing activities:      
Capitalized patent defense costs (2,289)
Purchase of property and equipment (638) (730) (359)
Purchase of intangible assets (278) (161)
Proceeds from maturities and sales of marketable securities 17,640 9,795 7,341
Purchase of marketable securities (4,248) (9,826) (7,630)
Net cash used/(provided) in investing activities 10,187 (922) (648)
Cash flows from financing activities:      
Net proceeds from equity-based compensation programs 130 773 463
Repurchase and cancellation of stock options (287) (1,752)
Tax benefits from equity-based compensation programs 690 41
Dividend payments (2,239) (1,817) (1,417)
Payments for stock repurchases (5,119) (6,086)
Net cash used in financing activities (7,515) (8,192) (913)
Effect of exchange rate changes on cash and cash equivalents 70 (32) (61)
Net increase (decrease) in cash and cash equivalents (6,529) (1,312) 5,972
Cash and cash equivalents at the beginning of the year 12,100 13,412 7,440
Cash and cash equivalents at the end of the year 5,571 12,100 13,412
Supplemental disclosure of cash flow information:      
Cash paid for income taxes $ 1,154 $ 6 $ 3,730