Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive Loss (unaudited)

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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net loss $ (2,836,887) $ (9,679,022) $ (9,185,052) $ (18,602,184)
Other comprehensive gain:        
Unrealized gain on available-for-sale securities 26,472 5,313 32,367 33,305
Comprehensive loss $ (2,810,415) $ (9,673,709) $ (9,152,685) $ (18,568,879)