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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income (loss) $ (468) $ 1,368
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 402 483
Amortization of deferred rent (17) (20)
Stock-based compensation expense 171 148
Provision for (recoveries of) doubtful accounts, net (2) 25
Change of inventory to net realizable value (34) 119
Loss on disposal of assets 49
Tax benefit from exercise of stock options (2) (583)
Deferred income taxes 25 47
Changes in operating assets and liabilities:    
Receivables 169 562
Inventories (2,766) (964)
Prepaid expenses and other assets (136) (144)
Accounts payable 1,361 1,378
Accrued liabilities 145 (82)
Income taxes payable (215) 106
Deferred product revenue 4 (354)
Other long-term liabilities (52)
Net cash provided by (used in) operating activities (1,363) 2,086
Cash flows from investing activities:    
Purchase of property and equipment (181) (139)
Purchase of intangibles (56)
Proceeds from maturities and sales of marketable securities 1,906 2,787
Purchase of marketable securities (2,437) (2,538)
Net cash provided by (used in) investing activities (768) 110
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 28 318
Repurchase and cancellation of stock options (1,752)
Tax benefit from exercise of stock options 583
Dividend payments (439) (459)
Payments for stock repurchases (928) (404)
Net cash used in financing activities (1,339) (1,714)
Effect of exchange rate changes on cash and cash equivalents 9 19
Net increase (decrease) in cash and cash equivalents (3,461) 501
Cash and cash equivalents at the beginning of the year 12,100 13,412
Cash and cash equivalents at the end of the year 8,639 13,913
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 1 $ 537