Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2014

Schedule of potential dilutive securities that would have been anti-dilutive due to net loss

		Three Months Ended March 31,
		2013		2014
Redeemable convertible preferred stock:
Series A		10,033,976		10,033,976
Series B		5,057,901		5,057,901
Series C		4,429,601		4,429,601
Series D		3,979,730		3,979,730
Warrants to purchase Series D redeemable convertible preferred stock		12,797		83,818
Stock options		5,033,358		6,738,838
Restricted stock units		—		986,841

Schedule of calculation of basic and diluted net loss per share attributable to common stockholders

		Three Months Ended March 31,
		2013			2014
Numerator (in thousands):
Net loss attributable to common stockholders		$	(3,833	)	$	(7,137	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		7,386,133			7,698,709
Net loss per share attributable to common stockholders, basic and diluted		$	(0.52	)	$	(0.93	)

Pro Forma

Schedule of calculation of basic and diluted net loss per share attributable to common stockholders

		Three Months Ended March 31, 2014
Numerator (in thousands):
Historical net loss attributable to common stockholders		$	(7,137	)
Accretion of deferred preferred stock offering costs		87
Changes in the fair value of the warrant to purchase Series D redeemable convertible preferred stock		688
Pro forma numerator for basic and diluted loss per share		$	(6,362	)
Denominator:
Historical denominator for basic and diluted net loss per share weighted-average shares		7,698,709
Plus: conversion of redeemable convertible preferred stock to common stock		23,501,208
Pro forma denominator for basic and diluted net loss per share attributable to common stockholders		31,199,917
Pro forma basic and diluted net loss per share attributable to common stockholders		$	(0.20	)