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Cash and Cash Equivalents and Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents
Realized Investment Gains (Losses)	$ 0us-gaap_RealizedInvestmentGainsLosses	$ 0us-gaap_RealizedInvestmentGainsLosses	$ 0us-gaap_RealizedInvestmentGainsLosses
Cash
Cash and Cash Equivalents
Available-for-sale Securities, Amortized Cost Basis	137,266us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CashMember	37,499us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CashMember
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_CashMember	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_CashMember
Available-for-sale Securities, Gross Unrealized Losses	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_CashMember	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_CashMember
Available-for-sale Securities, Current	137,266us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_CashMember	37,499us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_CashMember
Certificates of Deposit
Cash and Cash Equivalents
Available-for-sale Securities, Amortized Cost Basis	552us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember	552us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember
Available-for-sale Securities, Gross Unrealized Losses	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember
Available-for-sale Securities, Current	552us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember	552us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_CertificatesOfDepositMember
US Treasury Securities
Cash and Cash Equivalents
Available-for-sale Securities, Amortized Cost Basis	201,584us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember	91,075us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale Securities, Gross Unrealized Losses	(66)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember	(1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale Securities, Current	201,521us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember	91,077us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Short-term Investments
Cash and Cash Equivalents
Available-for-sale Securities, Amortized Cost Basis	202,136us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember	91,627us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember
Available-for-sale Securities, Gross Unrealized Losses	(66)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember	(1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember
Available-for-sale Securities, Current	202,073us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember	91,629us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_ShortTermInvestmentsMember
Cash and Cash Equivalents and Investments
Cash and Cash Equivalents
Available-for-sale Securities, Amortized Cost Basis	339,402us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_InvestmentsMember	129,126us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_InvestmentsMember
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_InvestmentsMember	3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / invest_InvestmentAxis = us-gaap_InvestmentsMember
Available-for-sale Securities, Gross Unrealized Losses	(66)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_InvestmentsMember	(1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / invest_InvestmentAxis = us-gaap_InvestmentsMember
Available-for-sale Securities, Current	$ 339,339us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_InvestmentsMember	$ 129,128us-gaap_AvailableForSaleSecuritiesCurrent / invest_InvestmentAxis = us-gaap_InvestmentsMember

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-SubTopic 10

-Section 45

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- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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-Name Accounting Standards Codification

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

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