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Fair Value Measurements-Cash and Short term Investments (Details) (Marketable Securities [Member], USD $)	Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	$ 30,207,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains	4,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized (Losses)	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value	30,211,000us-gaap_AvailableForSaleSecurities
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	5,999,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Gross Unrealized Gains	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Gross Unrealized (Losses)	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Estimated Fair Value	5,999,000us-gaap_AvailableForSaleSecurities / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost	24,208,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FinancialInstrumentAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Gross Unrealized Gains	4,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_FinancialInstrumentAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Gross Unrealized (Losses)	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_FinancialInstrumentAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Estimated Fair Value	$ 24,212,000us-gaap_AvailableForSaleSecurities / us-gaap_FinancialInstrumentAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ 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)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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Balance Type:	debit
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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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- 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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X

- 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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X

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