Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2019

Net Loss per Share

Basic and diluted net loss per share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Numerator:
Net loss	$	(55,319)	$	(32,740)	$	(142,760)	$	(94,187)
Denominator:
Weighted average shares of common stock outstanding		41,364,387		30,982,192		41,296,377		30,938,026
Net loss per share, basic and diluted	$	(1.34)	$	(1.06)	$	(3.46)	$	(3.04)

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

	September 30,
	2019	2018
Options to purchase common stock	3,573,394	4,323,353
Restricted stock unit awards	1,635,638	541,628
Total potential shares of common stock	5,209,032	4,864,981