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Description of Business and Basis of Presentation - Additional Information (Detail)
$ in Thousands
 9 Months Ended
Jul. 10, 2015
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Description Of Business And Basis Of Presentation [Line Items]        
Forward stock split of its outstanding common stock 1.8515 1.8515    
Accumulated deficit   $ (172,723)   $ (12,741)
Net cash used in operating activities   $ (14,220) $ (2,798)  
Common Stock        
Description Of Business And Basis Of Presentation [Line Items]        
Forward stock split of its outstanding common stock 1.8515      
Series B Preferred Stock        
Description Of Business And Basis Of Presentation [Line Items]        
Common stock, conversion basis   In March 2014, the Company entered into a definitive merger and share exchange agreement pursuant to which the Company redomesticated from the State of Illinois to the State of Delaware and the Illinois Company ceased to exist (the Redomestication). In connection with the Redomestication, the holders of Class A and Class B common stock received one share of Class A and Class B common stock of the Delaware Company, respectively, in exchange for fifteen shares of the Illinois Company. The holders of Series B preferred stock received one share of Series B preferred stock of the Delaware Company in exchange for one share of the Illinois Company. The holders of any options, warrants or other securities are subject to adjustment based on the ratio of one for fifteen. All share numbers and per share prices in the accompanying financial statements have been adjusted to reflect the 1 for 15 exchange.    
Forward stock split of its outstanding common stock   0.067