Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2018

Net Loss per Share

Basic and diluted net loss per share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Numerator:
Net loss	$	(32,740)	$	(18,192)	$	(94,187)	$	(45,589)
Denominator:
Weighted average shares of common stock outstanding		30,982,192		28,834,808		30,938,026		27,180,244
Net loss per share, basic and diluted	$	(1.06)	$	(0.63)	$	(3.04)	$	(1.68)

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

	September 30,
	2018	2017
Options to purchase common stock	4,323,353	3,242,831
Restricted stock unit awards	541,628	294,331
Total potential shares of common stock	4,864,981	3,537,162