CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,384,777)	$ (9,051,872)	$ (3,615,207)	$ (17,275,099)
Other comprehensive gain (loss):
Unrealized gain (loss) on available-for-sale securities	0	(93)	0	1,247
Comprehensive loss	$ (1,384,777)	$ (9,051,965)	$ (3,615,207)	$ (17,273,852)