Annual report pursuant to Section 13 and 15(d)

Income Taxes (Pre-Tax Earnings) (Detail)

v3.19.1
Income Taxes (Pre-Tax Earnings) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pre-Tax Income (Loss)      
Total Pre-Tax Income (Loss) $ (21,875,713) $ (19,633,502) $ (19,250,082)
U.S.      
Pre-Tax Income (Loss)      
Total Pre-Tax Income (Loss) (22,082,137) (19,680,720) (19,263,625)
Outside the U.S. [Member]      
Pre-Tax Income (Loss)      
Total Pre-Tax Income (Loss) $ 206,424 $ 47,218 $ 43,543