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Net Loss Per Share (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Options to purchase common stock    
Net Loss Per Share    
Awards outstanding but not included in the computation of diluted net income (loss) per share (in shares) 1,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
1,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
Restricted Stock Units    
Net Loss Per Share    
Awards outstanding but not included in the computation of diluted net income (loss) per share (in shares) 172,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
140,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember