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Property and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment Disclosure [Line Items]        
Depreciation expense $ 0 $ 72,589 $ 238,127 $ 351,403
Property and equipment, net $ 0   50,000 $ 837,867
Impairment loss     $ 548,638  
Minimum [Member]        
Property Plant And Equipment Disclosure [Line Items]        
Property, plant and equipment, useful life     3 years  
Maximum [Member]        
Property Plant And Equipment Disclosure [Line Items]        
Property, plant and equipment, useful life     7 years