Net Loss Per Common Share (Tables)

6 Months Ended

Jun. 30, 2016

Net Loss Per Common Share

Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2016	2015	2016	2015
Stock options issued and outstanding	2,348,615	1,055,700	2,348,615	1,055,700
Stock warrants	310,220	326,553	310,220	326,553
Unvested restricted common stock	—	1,750,794	—	1,750,794
	2,658,835	3,133,047	2,658,835	3,133,047

Summary of the basic and diluted net loss per common share

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
Numerator:
Net loss and comprehensive loss	$	(15,718,958	)	$	(9,919,175	)	$	(36,555,065	)	$	(15,372,379	)
Denominator:
Weighted-average basic and diluted common shares	23,013,838			7,030,976			19,876,850			5,045,211
Basic and diluted net loss per common share	$	(0.68	)	$	(1.41	)	$	(1.84	)	$	(3.05	)