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Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Changes in Redemption Value of Convertible Preferred Stock

The changes in the redemption value of the redeemable convertible preferred stock for the years ended December 31, 2015 and 2014 were as follows:

 

     Year Ended
December 31,		  
     2015      2014  
     (in thousands)  

Redeemable Convertible Preferred Stock

      

Series B

    $ 46,976      $ 6,447  

Series B-1

      36,961        2,836  

Series C

      52,832        2,449  

Series D

      237,246        38,117  
  

 

 

     

 

 

  

Total adjustment to redemption value on redeemable convertible preferred stock

    $ 374,015      $ 49,849