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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 2,787 $ 1,369
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 1,033 870
Amortization of deferred rent (47) (46)
Stock-based compensation expense 455 168
Provision for (recoveries of) doubtful accounts, net (6) 11
Write-down of inventory to net realizable value 130 424
Loss on disposal of assets 0 2
Tax benefit from exercise of stock options (29) (90)
Deferred income taxes (13) (333)
Changes in operating assets and liabilities:    
Receivables 1,319 (555)
Inventories (1,439) (749)
Prepaid expenses and other assets (377) 739
Accounts payable (19) (570)
Accrued liabilities (1,072) 441
Income taxes payable 969 (34)
Deferred product revenue (222) 1,086
Other long-term liabilities 604 (87)
Net cash provided by operating activities 2,865 2,820
Cash flows from investing activities:    
Payment towards business acquisitions 0 (13,078)
Purchase of property and equipment (182) (371)
Purchase of intangibles 0 (90)
Proceeds from maturities and sales of marketable securities 4,197 0
Purchases of marketable securities (3,204) (311)
Net cash provided by (used in) investing activities 811 (13,850)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 90 1,265
Tax benefits from equity-based compensation programs 29 90
Stock registration costs 0 (55)
Dividends paid (319) 0
Payments for stock repurchases 0 (1,169)
Net cash provided by (used in) financing activities (200) 131
Effect of exchange rate changes on cash and cash equivalents (43) 0
Net increase (decrease) in cash and cash equivalents 3,433 (10,899)
Cash and cash equivalents at the beginning of the period 7,440 17,192
Cash and cash equivalents at the end of the period 10,873 6,293
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 2,280 657
Stock issued for acquisitions $ 0 $ 1,679