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Redeemable Convertible Preferred Stock and Equity (Deficit) - Convertible Preferred Stock - Additional information (Detail) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Nov. 19, 2014
Dec. 31, 2013
Class Of Stock [Line Items]        
Convertible preferred stock converted into shares of common stock 33,919,954   33,919,954  
Convertible Preferred Stock [Member]        
Class Of Stock [Line Items]        
Authorized Shares       125,000,000
Preferred Stock, par value       $ 0.01
Outstanding convertible preferred stock 0 0