CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,230,430)	$ (8,223,227)
Other comprehensive gain (loss):
Unrealized gain on available-for-sale securities	0	1,340
Comprehensive loss	$ (2,230,430)	$ (8,221,887)