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Consolidated Statement of Redeemable Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Stock issuance costs $ 187us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts    
IPO [Member]      
Stock issuance costs 7,126us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Minimum [Member]      
Conversion price, per share     $ 14.51us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]      
Conversion price, per share     $ 39.21us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Series D Convertible Preferred Stock [Member]      
Issuance/sale of stock, price per share   $ 0.83us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
 
Stock issuance costs   $ 73us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember