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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]      
Redeemable convertible preferred stock (Series A, B, C, D and E), par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
Redeemable convertible preferred stock (Series A, B, C, D and E), shares authorized 0us-gaap_TemporaryEquitySharesAuthorized 99,292,610us-gaap_TemporaryEquitySharesAuthorized 78,372,931us-gaap_TemporaryEquitySharesAuthorized
Redeemable convertible preferred stock (Series A, B, C, D and E), shares issued 0us-gaap_TemporaryEquitySharesIssued 94,483,404us-gaap_TemporaryEquitySharesIssued 73,991,017us-gaap_TemporaryEquitySharesIssued
Redeemable convertible preferred stock (Series A, B, C, D and E), shares outstanding 0us-gaap_TemporaryEquitySharesOutstanding 94,483,404us-gaap_TemporaryEquitySharesOutstanding 73,991,017us-gaap_TemporaryEquitySharesOutstanding
Redeemable convertible preferred stock (Series A, B, C, D and E), aggregate liquidation preference value   $ 104,588us-gaap_TemporaryEquityLiquidationPreference $ 63,629us-gaap_TemporaryEquityLiquidationPreference
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 0us-gaap_PreferredStockSharesAuthorized  
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued  
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding  
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 115,000,000us-gaap_CommonStockSharesAuthorized 115,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 22,707,012us-gaap_CommonStockSharesIssued 729,391us-gaap_CommonStockSharesIssued 736,026us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 22,707,012us-gaap_CommonStockSharesOutstanding 729,391us-gaap_CommonStockSharesOutstanding 736,026us-gaap_CommonStockSharesOutstanding