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Convertible Notes Payable - Schedule of Convertible Notes Payable (Parenthetical) (Detail)
12 Months Ended
May 08, 2017
Jan. 22, 2016
Dec. 31, 2016
Debt Disclosure [Abstract]      
Interest rate for current maturities   2.50% 5.00%
Due date for current maturities   2017 2016
Debt instrument current maturity date May 21, 2018