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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net loss $ (6,639,125) $ (9,479,116) $ (38,989,953) $ (32,565,023)
Other comprehensive income (loss):        
Unrealized gain (loss) on investment in affiliated entity 0 312,253 0 (437,708)
Unrealized gain (loss) on short-term investments (137,250) 86,862 (250,015) 290,402
Comprehensive loss $ (6,776,375) $ (9,080,001) $ (39,239,968) $ (32,712,329)