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Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Liabilities    
Liability, fair value   $ 3,447,000
Fair Value, Measurements, Recurring [Member]    
Liabilities    
Liability, fair value $ 0  
Fair Value, Measurements, Recurring [Member] | Convertible Notes [Member]    
Liabilities    
Liability, fair value   3,447,000
Level 2 [Member]    
Liabilities    
Liability, fair value   3,447,000
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Notes [Member]    
Liabilities    
Liability, fair value   $ 3,447,000