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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net loss $ (32,350,828) $ (23,085,907)
Other comprehensive income (loss):    
Unrealized loss on investment in affiliated entity 0 (749,961)
Unrealized gain (loss) on short-term investments (112,765) 203,540
Comprehensive loss $ (32,463,593) $ (23,632,328)