Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 1,272us-gaap_ProfitLoss	$ 485us-gaap_ProfitLoss
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	21us-gaap_ProvisionForDoubtfulAccounts	(27)us-gaap_ProvisionForDoubtfulAccounts
Write-down of inventory to net realizable value	47us-gaap_InventoryWriteDown	416us-gaap_InventoryWriteDown
Loss on disposal of assets	0us-gaap_GainLossOnDispositionOfAssets	2us-gaap_GainLossOnDispositionOfAssets
Tax benefit from exercise of stock options	(7)	(87)
Changes in operating assets and liabilities:
Receivables	1,205us-gaap_IncreaseDecreaseInReceivables	853us-gaap_IncreaseDecreaseInReceivables
Inventories	(806)us-gaap_IncreaseDecreaseInInventories	40us-gaap_IncreaseDecreaseInInventories
Deferred income taxes	0	44
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 patents	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:
Proceeds from the exercise of stock options	20	1,021
Tax benefits from stock options	7	87
Stock registration costs	0us-gaap_PaymentsOfStockIssuanceCosts	(55)us-gaap_PaymentsOfStockIssuanceCosts
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	881us-gaap_IncomeTaxesPaid	29us-gaap_IncomeTaxesPaid
Stock issued for acquisitions	$ 0	$ 1,679

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