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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (USD $)
In Thousands, except Share data
Total
USD ($)
Series B Preferred Stock [Member]
Series C Preferred Stock [Member]
Series D Preferred Stock [Member]
Series E Preferred Stock [Member]
Redeemable convertible preferred stock [Member]
USD ($)
Redeemable convertible preferred stock [Member]
Series B Preferred Stock [Member]
USD ($)
Redeemable convertible preferred stock [Member]
Series C Preferred Stock [Member]
USD ($)
Redeemable convertible preferred stock [Member]
Series D Preferred Stock [Member]
USD ($)
Redeemable convertible preferred stock [Member]
Series E Preferred Stock [Member]
USD ($)
Common Stock [Member]
USD ($)
Additional Paid-in Capital [Member]
USD ($)
Accumulated Deficit [Member]
USD ($)
Temporary equity, beginning balance at Dec. 31, 2010           $ 30,453us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Beginning balance at Dec. 31, 2010 (27,786)us-gaap_StockholdersEquity                   1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 56us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (27,843)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, beginning balance, shares at Dec. 31, 2010           42,947,474us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Beginning balance, shares at Dec. 31, 2010                     719,957us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Issuance of redeemable convertible preferred stock, value             2,016us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 8,053us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		          
Issuance of redeemable convertible preferred stock, shares             2,682,011us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 8,923,884us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		          
Stock-based compensation expense 80us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue                     80us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Accretion of redeemable convertible preferred stock to redemption value (53)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment         53us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		           (53)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Net loss (13,157)us-gaap_NetIncomeLoss                       (13,157)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2011           40,575us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Ending balance at Dec. 31, 2011 (40,916)us-gaap_StockholdersEquity                   1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 83us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (41,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2011           54,553,369us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Beginning balance, shares at Dec. 31, 2011                     719,957us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Issuance of redeemable convertible preferred stock, value               7,067us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 8,990us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		        
Issuance of redeemable convertible preferred stock, shares               7,808,400us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 6,653,988us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		        
Conversion of promissory notes and accrued interest to convertible preferred stock, value                 6,086us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		        
Conversion of promissory notes and accrued interest to convertible preferred stock, shares                 4,975,260us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		        
Issuance of common stock upon exercise of stock options, value 13us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised                     13us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Issuance of common stock upon exercise of stock options, shares 16,069us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                   16,069us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Stock-based compensation expense 121us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue                     121us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Accretion of redeemable convertible preferred stock to redemption value (67)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment         67us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		           (67)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Net loss (13,880)us-gaap_NetIncomeLoss                       (13,880)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2012 62,785us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital         62,785us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Ending balance at Dec. 31, 2012 (54,729)us-gaap_StockholdersEquity                   1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 150us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (54,880)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2012 73,991,017us-gaap_TemporaryEquitySharesOutstanding 40,266,246us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 16,732,284us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 11,629,248us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		   73,991,017us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Ending balance, shares at Dec. 31, 2012                     736,026us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Issuance of redeemable convertible preferred stock, value                 5,955us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 34,844us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		      
Repurchase and retirement of common stock, at cost                     (6,635)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Issuance of redeemable convertible preferred stock, shares                 4,381,914us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		 16,110,473us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		      
Stock-based compensation expense 395us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue                     395us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Accretion of redeemable convertible preferred stock to redemption value (213)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment         213us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		           (213)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Net loss (14,027)us-gaap_NetIncomeLoss                       (14,027)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2013 103,797us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital         103,797us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Ending balance at Dec. 31, 2013 $ (68,574)us-gaap_StockholdersEquity                   $ 1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 332us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (68,907)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2013 94,483,404us-gaap_TemporaryEquitySharesOutstanding 40,266,246us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 16,732,284us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 16,011,162us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 16,110,473us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember		 94,483,404us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemableConvertiblePreferredStockMember		              
Ending balance, shares at Dec. 31, 2013                     729,391us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember