Annual report pursuant to Section 13 and 15(d)

Unaudited Quarterly Financial Information - Summary of the Company's Unaudited Quarterly Results of Operations (Detail)

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Unaudited Quarterly Financial Information - Summary of the Company's Unaudited Quarterly Results of Operations (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                    
Revenues $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0    
Total operating expenses 2,824,546 2,764,341 2,283,549 2,121,704 1,412,383 1,921,520 1,396,759 1,987,656 $ 9,994,140 $ 6,718,318
Profit (Loss) from discontinued operations           0 121 (121)    
Net loss (2,755,620) (2,757,835) (2,281,289) (2,119,397) $ (1,460,733) $ (2,067,230) $ (1,220,866) $ (1,982,696) (9,914,141) (6,731,525)
Net Loss applicable to common shareholders $ (2,755,620) $ (4,169,876) $ (2,281,289) $ (2,119,397)         $ (11,326,182) $ (6,731,525)
Loss per share:                    
Basic and diluted net loss per share from continuing operations $ (0.09) $ (0.35) $ (0.38) $ (0.42) $ (0.30) $ (0.42) $ (0.25) $ (0.40)    
Basic and diluted net profit per share from discontinued operations         $ 0.00 $ 0.00 $ 0.00 $ 0.00