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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 5,204 $ 2,962
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 1,551 1,427
Amortization of deferred rent (70) (69)
Stock-based compensation expense 648 266
Provision for (recoveries of) doubtful accounts, net (7) 40
Write-down of inventory to net realizable value 396 537
Tax benefit from exercise of stock options (49) (92)
Deferred income taxes (2) (333)
Changes in operating assets and liabilities:    
Receivables 552 (65)
Inventories (1,478) (1,136)
Prepaid expenses and other assets 635 (396)
Accounts payable (553) (298)
Accrued liabilities (635) 828
Income taxes payable 1,006 1,381
Deferred product revenue (183) 822
Other long-term liabilities 605 62
Net cash provided by operating activities 6,410 5,812
Cash flows from investing activities:    
Payment towards business acquisitions 0 (13,068)
Purchase of property and equipment (98) (496)
Purchase of intangibles 0 (90)
Proceeds from maturities and sales of marketable securities 5,102 6,790
Purchases of marketable securities (5,987) (6,655)
Net cash (used in) investing activities (983) (13,519)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 274 1,297
Tax benefits from equity-based compensation programs 49 92
Stock registration costs 0 (55)
Dividends paid (639) 0
Payments for stock repurchases 0 (1,927)
Net cash used in financing activities (316) (593)
Effect of exchange rate changes on cash and cash equivalents (64) 0
Net increase (decrease) in cash and cash equivalents 5,047 (8,300)
Cash and cash equivalents at the beginning of the period 7,440 17,192
Cash and cash equivalents at the end of the period 12,487 8,892
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 2,285 1,695
Stock issued for acquisitions $ 0 $ 1,679