Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2017

Net Loss per Share

Basic and diluted net loss per share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Numerator:
Net loss	$	(14,838)	$	(12,871)	$	(27,397)	$	(25,910)
Denominator:
Weighted average shares of common stock outstanding		26,594,854		20,663,088		26,339,250		20,417,301
Net loss per share, basic and diluted	$	(0.56)	$	(0.62)	$	(1.04)	$	(1.27)

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

	June 30,
	2017	2016
Stock options to purchase common stock	2,773,066	1,913,419
Restricted stock unit awards	222,886	85,000
Total potential common shares	2,995,952	1,998,419