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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 3,532 $ 5,204
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 1,408 1,551
Amortization of deferred rent (57) (70)
Stock-based compensation expense 494 648
Provision for (recoveries of) doubtful accounts, net (6) (7)
Write-down of inventory to net realizable value 458 396
Loss on disposal of assets 54
Tax benefit from exercise of stock options (721) (49)
Deferred income taxes 107 (2)
Changes in operating assets and liabilities:    
Receivables 234 552
Inventories 1,353 (1,478)
Prepaid expenses and other assets (147) 635
Accounts payable 770 (553)
Accrued liabilities (134) (635)
Income taxes payable 429 1,006
Deferred product revenue (284) (183)
Other long-term liabilities (51) (605)
Net cash provided by operating activities 7,439 6,410
Cash flows from investing activities:    
Purchase of property and equipment (544) (98)
Proceeds from maturities and sales of marketable securities 5,371 5,102
Purchases of marketable securities (6,608) (5,987)
Net cash provided by (used in) investing activities (1,781) (983)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 736 274
Repurchase and cancellation of stock options (1,752)
Tax benefits from exercise of stock options 721 49
Dividends paid (1,373) (639)
Repurchase and cancellation of stock (5,139)
Net cash used in financing activities (6,807) (316)
Effect of exchange rate changes on cash and cash equivalents 10 (64)
Net increase (decrease) in cash and cash equivalents (1,139) 5,047
Cash and cash equivalents at the beginning of the period 13,412 7,440
Cash and cash equivalents at the end of the period 12,273 12,487
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 893 $ 2,285