Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2015

Schedule of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Numerator:
Net loss	$	(10,667	)	$	(2,484	)	$	(26,028	)	$	(8,350	)
Accretion of convertible preferred stock to redemption value		—			(18	)		(23	)		(52	)

Net loss attributable to common stockholders	$	(10,667	)	$	(2,502	)	$	(26,051	)	$	(8,402	)

Denominator:
Weighted average common shares outstanding — basic and diluted		4,093,836			4,056,818			4,077,551			3,950,468
Less: Weighted average shares of unvested restricted common stock outstanding		(186,640	)		(471,215	)		(196,772	)		(368,255	)

Weighted average common shares outstanding used in calculating net loss per share attributable to common stockholders — basic and diluted		3,907,196			3,585,603			3,880,779			3,582,213

Net loss per share attributable to common stockholders — basic and diluted	$	(2.73	)	$	(0.70	)	$	(6.71	)	$	(2.35	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an antidilutive effect:


	Three and Nine Months Ended September 30,
	2015		2014
Convertible preferred stock (as converted to common stock)		15,286,968		3,421,142
Options to purchase common stock		3,021,324		811,669
Unvested restricted common stock		174,008		469,211
Warrant for the purchase of common stock		11,973		11,973

		18,494,273		4,713,995