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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net loss $ (8,268,395) $ (9,592,461)
Other comprehensive gain (loss):    
Unrealized gain (loss) on available-for-sale securities (10,739) 44,259
Comprehensive loss $ (8,279,134) $ (9,548,202)