Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2018

Net Loss per Share

Basic and diluted net loss per share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Numerator:
Net loss	$	(31,218)	$	(14,838)	$	(61,447)	$	(27,397)
Denominator:
Weighted average shares of common stock outstanding		30,944,899		26,594,854		30,915,577		26,339,250
Net loss per share, basic and diluted	$	(1.01)	$	(0.56)	$	(1.99)	$	(1.04)

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

	June 30,
	2018	2017
Options to purchase common stock	4,315,942	2,773,066
Restricted stock unit awards	532,756	222,886
Total potential shares of common stock	4,848,698	2,995,952