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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                    
Revenues $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Total operating expenses 1,412,383 1,921,520 1,396,759 1,987,656 2,707,908 2,026,670 1,733,282 2,074,645 6,718,318 8,542,505
Profit (loss) from discontinued operations   0 121 (121) 9,386 42,566 1,420,947 11,113   1,484,012
Net loss $ (1,460,733) $ (2,067,230) $ (1,220,866) $ (1,982,696) $ (2,674,797) $ (1,963,007) $ (312,615) $ (2,062,885) $ (6,731,525) $ (7,013,304)
Loss per share:                    
Basic and diluted net loss per share from continuing operations $ (0.30) $ (0.42) $ (0.25) $ (0.40) $ (0.55) $ (0.41) $ (0.43) $ (0.52) $ (1.37) $ (1.90)
Basic and diluted net profit per share from discontinued operations $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.01 $ 0.35 $ 0.00   $ 0.33