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Warrants - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 21, 2015
Dec. 03, 2014
Jul. 20, 2012
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Mar. 31, 2015
Class of Warrant or Right [Line Items]                    
Warrant expense             $ 3,100,000 $ 11,000    
Investor Warrants [Member]                    
Class of Warrant or Right [Line Items]                    
Class of Warrants or right to purchase common stock                 13,333,334  
Class of Warrants or right to purchase common stock, exercise price                 $ 2.25  
Warrants exercisable period             6 months      
Warrants expiry period             5 years      
Warrant expense $ 2.28           $ 2.28      
Placement Agent Warrant [Member]                    
Class of Warrant or Right [Line Items]                    
Class of Warrants or right to purchase common stock                 133,333  
Class of Warrants or right to purchase common stock, exercise price                 $ 2.25  
Warrants expiry period             5 years      
Warrant expense             $ 2.28      
Consulting Agreement Warrant [Member]                    
Class of Warrant or Right [Line Items]                    
Class of Warrants or right to purchase common stock                   7,398
Class of Warrants or right to purchase common stock, exercise price                   $ 9.75
Warrants exercisable period           24 months        
Warrants expiry period           10 years        
Warrants, forfeiture     (3,699)              
Warrants vested and exercisable 3,699 3,699                
Warrants, percentage of forfeiture     50.00%              
Affiliates Of Advisor Warrant [Member]                    
Class of Warrant or Right [Line Items]                    
Class of Warrants or right to purchase common stock 156,138 156,138     161,977   156,138 156,138    
Class of Warrants or right to purchase common stock, exercise price $ 0.01 $ 0.01     $ 0.01   $ 0.01 $ 0.01    
Warrants expiry period         10 years          
Fair value of the warrants, risk-free interest rate         0.22%          
Fair value of the warrants, implied volatility         99.00%          
Fair value of the warrants, expected term to liquidity even         1 year 8 months 12 days          
Surrender of warrant to satisfy related liability       5,839