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Cash, Cash Equivalents and Investments - Contractual Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Abstract]    
Due within one year or less $ 9,095us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due after one year through five years 11,861qtwo_AvailableforsaleSecuritiesDebtMaturitiesAfterTwelveMonthsFairValue 0qtwo_AvailableforsaleSecuritiesDebtMaturitiesAfterTwelveMonthsFairValue
Total $ 20,956us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate