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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2013
Jun. 05, 2014
Feb. 28, 2014
Subsequent Event [Line Items]                
Redeemable convertible preferred stock, issued 0us-gaap_TemporaryEquitySharesIssued   94,483,404us-gaap_TemporaryEquitySharesIssued 73,991,017us-gaap_TemporaryEquitySharesIssued        
Proceeds from issuance of redeemable convertible preferred stock $ 442us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock $ 5,955us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock $ 40,799us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock $ 16,057us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock $ 10,069us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock      
Redeemable convertible preferred stock, issuance cost 2,312us-gaap_PaymentsOfStockIssuanceCosts 165us-gaap_PaymentsOfStockIssuanceCosts 196us-gaap_PaymentsOfStockIssuanceCosts          
Series E Preferred Stock [Member]                
Subsequent Event [Line Items]                
Redeemable convertible preferred stock, issued     16,110,473us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
    16,110,473us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Redeemable convertible preferred stock, issuance price     $ 2.1725us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
    $ 2.1725us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Proceeds from issuance of redeemable convertible preferred stock           35,000us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Redeemable convertible preferred stock, issuance cost     156us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
    156us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Redeemable convertible preferred stock, conversion ratio             1-for-6.28  
Subsequent Event [Member] | Series E Preferred Stock [Member]                
Subsequent Event [Line Items]                
Redeemable convertible preferred stock, issued               204,101us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Redeemable convertible preferred stock, issuance price               $ 2.1725us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Proceeds from issuance of redeemable convertible preferred stock               443us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Redeemable convertible preferred stock, issuance cost               $ 1us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember