Annual report pursuant to Section 13 and 15(d)

Fixed Assets, Net (Additional Information) (Detail)

v3.19.1
Fixed Assets, Net (Additional Information) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tooling and Equipment      
Property, Plant and Equipment [Line Items]      
Depreciation and Amortization $ 1,273,527 $ 921,113 $ 663,943