Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2016

Net Loss per Share

Basic and diluted net loss per share attributable to common stockholders

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Numerator:
Net loss	$	(10,694)	$	(10,632)	$	(36,604)	$	(15,849)
Accretion of redeemable convertible preferred stock		—		(1,020)		—		(2,353)
Net loss attributable to common stockholders	$	(10,694)	$	(11,652)	$	(36,604)	$	(18,202)
Denominator:
Weighted average shares of common stock outstanding		21,415,871		2,730,427		20,752,590		2,730,427
Less: Weighted average shares of unvested restricted common stock outstanding		—		(455,810)		—		(574,742)
Weighted average common shares outstanding used in calculating net loss per share attributable to common stockholders, basic and diluted		21,415,871		2,274,617		20,752,590		2,155,685
Net loss per share attributable to common stockholders, basic and diluted	$	(0.50)	$	(5.12)	$	(1.76)	$	(8.44)

Potential common shares excluded from the calculation of diluted net loss per share attributable to common stockholders

	2016	2015
Stock options to purchase common stock	1,867,501	1,140,524
Restricted stock unit awards	89,000	—
Unvested restricted common stock	—	399,757
Convertible preferred stock (as converted to common stock)	—	11,677,076
	1,956,501	13,217,357