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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$ 201,537us-gaap_SalesRevenueNet	$ 155,047us-gaap_SalesRevenueNet	$ 154,029us-gaap_SalesRevenueNet
Cost of goods sold	73,771us-gaap_CostOfRevenue	55,176us-gaap_CostOfRevenue	54,464us-gaap_CostOfRevenue
Gross profit	127,766us-gaap_GrossProfit	99,871us-gaap_GrossProfit	99,565us-gaap_GrossProfit
Operating costs:
Sales and marketing	43,362us-gaap_SellingAndMarketingExpense	40,323us-gaap_SellingAndMarketingExpense	37,768us-gaap_SellingAndMarketingExpense
Research and development	19,497us-gaap_ResearchAndDevelopmentExpense	21,315us-gaap_ResearchAndDevelopmentExpense	18,794us-gaap_ResearchAndDevelopmentExpense
General and administrative	22,287us-gaap_GeneralAndAdministrativeExpense	21,196us-gaap_GeneralAndAdministrativeExpense	20,071us-gaap_GeneralAndAdministrativeExpense
Amortization of purchased intangible assets	4,532us-gaap_AmortizationOfIntangibleAssets	3,325us-gaap_AmortizationOfIntangibleAssets	1,905us-gaap_AmortizationOfIntangibleAssets
Total operating costs	89,678us-gaap_OperatingExpenses	86,159us-gaap_OperatingExpenses	78,538us-gaap_OperatingExpenses
Operating income	38,088us-gaap_OperatingIncomeLoss	13,712us-gaap_OperatingIncomeLoss	21,027us-gaap_OperatingIncomeLoss
Interest income, net	118us-gaap_InterestIncomeExpenseNet	162us-gaap_InterestIncomeExpenseNet	261us-gaap_InterestIncomeExpenseNet
Other income, net	(286)us-gaap_OtherNonoperatingIncomeExpense	240us-gaap_OtherNonoperatingIncomeExpense	409us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes	37,920us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	14,114us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21,697us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	5,309us-gaap_IncomeTaxExpenseBenefit	3,147us-gaap_IncomeTaxExpenseBenefit	5,468us-gaap_IncomeTaxExpenseBenefit
Net income-continuing operations	32,611us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	10,967us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	16,229us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net income (loss) from discontinued operations	873us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	180us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income	$ 33,484us-gaap_NetIncomeLoss	$ 11,147us-gaap_NetIncomeLoss	$ 15,599us-gaap_NetIncomeLoss
Basic income (loss) per share:
Continuing operations	$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.43us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued Operations	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total net income per share	$ 0.85us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted income (loss) per share:
Continuing operations	$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.42us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued Operations	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total net income per share	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic	39,337us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,873us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,068us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	39,499us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,158us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,677us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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