Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive Loss

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Consolidated Statements of Comprehensive Loss - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net loss $ (19,106,481) $ (6,348,164)
Other comprehensive gain:    
Unrealized (loss) gain on available-for-sale securities (16,800) 5,895
Comprehensive loss $ (19,123,281) $ (6,342,269)