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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net loss $ (25,015,672) $ (34,134,570) $ (64,005,625) $ (66,699,593)
Other comprehensive income (loss):        
Unrealized loss on investment in affiliated entity 0 (619,757) 0 (1,057,465)
Unrealized gain (loss) on short-term investments 316,626 (1,245) 66,611 289,157
Comprehensive loss $ (24,699,046) $ (34,755,572) $ (63,939,014) $ (67,467,901)