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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Net product revenue $ 240,292 $ 0
Other revenue 2,255 0
Total revenue 242,547 0
Costs and expenses:    
Cost of product revenue 79,106 197,020
Research and development 3,914,974 4,387,079
Selling, general and administrative 4,594,716 5,111,695
Total costs and expenses 8,588,796 9,695,794
Loss from operations (8,346,249) (9,695,794)
Interest income, net 77,854 103,333
Net loss (8,268,395) (9,592,461)
Net loss attributable to common stockholders $ (8,268,395) $ (9,592,461)
Net loss per share attributable to common stockholders - basic and diluted (in usd per share) $ (0.49) $ (0.61)
Weighted-average number of common shares outstanding — basic and diluted (in shares) 16,873,512 15,843,532