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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 1,368 $ 1,272
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 483 521
Amortization of deferred rent (20) (23)
Stock-based compensation expense 148 238
Provision for doubtful accounts, net 25 21
Write-down of inventory to net realizable value 119 47
Loss on disposal of assets 49 0
Tax benefit from exercise of stock options (583) (7)
Deferred income taxes (47) 0
Changes in operating assets and liabilities:    
Receivables 562 1,205
Inventories (964) (806)
Prepaid expenses and other assets (144) 877
Accounts payable 1,378 820
Accrued liabilities (82) (832)
Income taxes payable 106 338
Deferred product revenue (354) (291)
Other long-term liabilities (52) (537)
Net cash provided by operating activities 2,086 2,843
Cash flows from investing activities:    
Purchase of property and equipment (139) (76)
Proceeds from maturities and sales of marketable securities 2,787 2,376
Purchases of marketable securities (2,538) (1,612)
Net cash provided by investing activities 110 688
Cash flows from financing activities:    
Proceeds from the exercise of stock options 318 20
Repurchase and cancellation of stock options (1,752) 0
Tax benefit from exercise of stock options 583 7
Dividends paid (459) 0
Repurchase and cancellation of stock (404) 0
Net cash (used in) provided by financing activities (1,714) 27
Effect of exchange rate changes on cash and cash equivalents 19 (133)
Net increase in cash and cash equivalents 501 3,425
Cash and cash equivalents at the beginning of the period 13,412 7,440
Cash and cash equivalents at the end of the period 13,913 10,865
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 537 $ 881