Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Property and Equipment - Additional Information (Detail)

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Property and Equipment, Net - Property and Equipment - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 361,382 $ 307,906
Germany [Member]    
Property, Plant and Equipment [Line Items]    
Percentage of property and equipment 86.00%  
United States [Member]    
Property, Plant and Equipment [Line Items]    
Percentage of property and equipment 14.00%