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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net loss $ (10,637,494) $ (8,152,844) $ (31,593,088) $ (21,248,823)
Other comprehensive gain (loss):        
Unrealized gain (loss) on available-for-sale securities (24,818) (3,676) 39,326 (3,676)
Comprehensive loss $ (10,662,312) $ (8,156,520) $ (31,553,762) $ (21,252,499)