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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 1,272 $ 485
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 521 324
Amortization of deferred rent (23) (21)
Stock-based compensation expense 238 84
Provision for (recoveries of) doubtful accounts, net 21 (27)
Write-down of inventory to net realizable value 47 416
Loss on disposal of assets 0 2
Tax benefit from exercise of stock options (7) (87)
Deferred income taxes 0 44
Changes in operating assets and liabilities:    
Receivables 1,205 853
Inventories (806) 40
Prepaid expenses and other assets 877 886
Accounts payable 820 178
Accrued liabilities (832) 210
Income taxes payable 338 235
Deferred product revenue (291) (51)
Other long-term liabilities 537 0
Net cash provided by operating activities 2,843 3,571
Cash flows from investing activities:    
Payment towards business acquisitions 0 (13,060)
Purchase of property and equipment (76) (249)
Purchase of intangibles 0 (90)
Proceeds from maturities and sales of marketable securities 2,376 0
Purchases of marketable securities (1,612) (780)
Net cash provided by (used in) investing activities 688 (14,179)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 20 1,021
Tax benefits from equity-based compensation programs 7 87
Stock registration costs 0 (55)
Net cash provided by financing activities 27 1,053
Effect of exchange rate changes on cash and cash equivalents (133) 0
Net increase (decrease) in cash and cash equivalents 3,425 (9,555)
Cash and cash equivalents at the beginning of the period 7,440 17,192
Cash and cash equivalents at the end of the period 10,865 7,637
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 881 29
Stock issued for acquisitions $ 0 $ 1,679