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Summary of Significant Accounting Policies (Cash and Equivalents) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 32,335us-gaap_CashAndCashEquivalentsAtCarryingValue $ 119,471us-gaap_CashAndCashEquivalentsAtCarryingValue $ 17,399us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,104us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 4,481us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember		 4,251us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember		    
Money market funds [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 20,354us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember		 100,049us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember		    
Government-backed security [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 7,500us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USGovernmentDebtSecuritiesMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USGovernmentDebtSecuritiesMember		    
Corporate debt securities [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember		 $ 15,171us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember