Net loss per share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The detail of the computation of basic and diluted earnings per share is as follows:

	THREE MONTHS ENDED SEPTEMBER 30,						NINE MONTHS ENDED SEPTEMBER 30,
	2014			2013			2014			2013
Numerator
Net loss	$	(6,284,080	)	$	(3,367,487	)	$	(15,936,517	)	$	(5,189,256	)
Accretion for liquidation preference on preferred stock		—			(1,397,867	)		(1,132,893	)		(3,953,595	)
Accretion for share issuance costs on preferred stock		—			(9,602	)		(19,551	)		(96,039	)
Tax expense on preferred stock		—			54,726			(100,291	)		(421,974	)
Reversal of tax payable on preferred stock due to conversion of preferred stock		—			—			1,897,702			—
Extinguishment of remaining share issuance costs due to conversion of preferred stock		—			—			(439,227	)		—
Total loss attributable to common stockholders	$	(6,284,080	)	$	(4,720,230	)	$	(15,730,777	)	$	(9,660,864	)
Denominator
Weighted average shares used to compute basic and diluted net loss per common share		10,695,042			301,745			7,984,052			301,745
Net loss per share attributable to common stockholders – basic and diluted	$	(0.59	)	$	(15.64	)	$	(1.97	)	$	(32.02	)

Schedule of Antidilutive Securities Excluded from Computation of Basic and Diluted Net Loss Per Share

The following have been excluded from the computation of basic and diluted net loss per share as their effect would have been antidilutive:

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
	2014		2013		2014		2013
Convertible preferred stock		—		5,525,844		—		5,525,844
Outstanding stock options		813,358		514,176		813,358		514,176
Common stock warrants		11,363		—		11,363		—
Total		824,721		6,040,020		824,721		6,040,020