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Quarterly Financial Information (unaudited) (Details) - 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
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]                      
Revenues $ 6,585 $ 10,938 $ 47,898 $ 19,097 $ 0 $ 0 $ 53,278 $ 0 $ 84,518 $ 53,278.00 $ 0.00
Operating loss (2,417,714) (2,720,027) (2,784,583) (2,443,472) (2,655,756) (2,439,230) (2,087,074) (2,049,098) (10,365,796) (9,232,099) (8,065,054)
Net loss $ (2,424,095) $ (2,727,028) $ (2,781,149) $ (2,449,787) $ (2,663,249) $ (2,446,219) $ (2,093,436) $ (2,055,743) $ (10,382,059) $ (9,258,647) $ (8,470,661)
Basic and diluted net loss per share (in dollars per share) $ (0.30) $ (0.21) $ (0.22) $ (0.21) $ (0.30) $ (0.28) $ (0.24) $ (0.24) $ (0.94) $ (1.06) $ (1.60)