Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2017

Net Loss per Share

Basic and diluted net loss per share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Numerator:
Net loss	$	(18,192)	$	(10,694)	$	(45,589)	$	(36,604)
Denominator:
Weighted average shares of common stock outstanding		28,834,808		21,415,871		27,180,244		20,752,590
Net loss per share, basic and diluted	$	(0.63)	$	(0.50)	$	(1.68)	$	(1.76)

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

	September 30,
	2017	2016
Options to purchase common stock	3,242,831	1,913,419
Restricted stock unit awards	294,331	85,000
Total potential common shares	3,537,162	1,998,419