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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)

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