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Warrants - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 02, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]        
Warrants to purchase common stock   3,999,998    
Purchase price per share   $ 0.0045    
Warrants expiration duration   8 years    
Expense recognized inclusive of accelerated expense for warrants performance criteria.   $ 348,000 $ 0 $ 0
Accelerated recognition of remaining warrant expense $ 255,000