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Consolidated Statements of Comprehensive Loss - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net loss $ (96,967,830) $ (88,205,772) $ (73,740,339)
Other comprehensive income (loss):      
Unrealized loss on investment in affiliated entity, net of tax 0 (1,452,431) (1,268,404)
Unrealized gain (loss) on short-term investments, net of tax (180,496) 7,458 (111,967)
Comprehensive loss $ (97,148,326) $ (89,650,745) $ (75,120,710)