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Condensed Consolidated Statements of Operations - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
License revenue $ 38,095 $ 38,095
Research and development:    
Noncash compensation 2,306,099 386,925
Other research and development 20,375,794 11,230,415
Total research and development 22,681,893 11,617,340
General and administrative:    
Noncash compensation 3,689,356 1,312,040
Other general and administrative 1,333,268 1,100,871
Total general and administrative 5,022,624 2,412,911
Total costs and expenses 27,704,517 14,030,251
Operating loss (27,666,422) (13,992,156)
Other (income) expense:    
Interest income (44,696) (84,862)
Other (income) expense 105,783 (58,632)
Total other (income) expense, net 61,087 (143,494)
Net loss $ (27,727,509) $ (13,848,662)
Basic and diluted net loss per common share $ (0.52) $ (0.28)
Weighted average shares used in computing basic and diluted net loss per common share 53,157,851 48,908,278