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Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 65,135us-gaap_SalesRevenueNet	$ 38,823us-gaap_SalesRevenueNet
Cost of goods sold	27,461us-gaap_CostOfRevenue	13,027us-gaap_CostOfRevenue
Gross profit	37,674us-gaap_GrossProfit	25,796us-gaap_GrossProfit
Operating costs:
Sales and marketing	9,793us-gaap_SellingAndMarketingExpense	10,371us-gaap_SellingAndMarketingExpense
Research and development	4,549us-gaap_ResearchAndDevelopmentExpense	5,141us-gaap_ResearchAndDevelopmentExpense
General and administrative	6,119us-gaap_GeneralAndAdministrativeExpense	5,273us-gaap_GeneralAndAdministrativeExpense
Amortization of purchased intangible assets	1,136us-gaap_AmortizationOfIntangibleAssets	1,120us-gaap_AmortizationOfIntangibleAssets
Total operating costs	21,597us-gaap_OperatingExpenses	21,905us-gaap_OperatingExpenses
Operating income	16,077us-gaap_OperatingIncomeLoss	3,891us-gaap_OperatingIncomeLoss
Interest income, net	80us-gaap_InterestIncomeExpenseNet	24us-gaap_InterestIncomeExpenseNet
Other income (expense), net	(277)us-gaap_OtherNonoperatingIncomeExpense	438us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes	15,880us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	4,353us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	2,223us-gaap_IncomeTaxExpenseBenefit	827us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	13,657us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3,526us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Loss from discontinued operations	(23)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income	$ 13,634us-gaap_NetIncomeLoss	$ 3,510us-gaap_NetIncomeLoss
Basic income (loss) per share
Continuing	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Diluted income (loss) per share
Continuing	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic	39,527us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,272us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	39,660us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,389us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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