Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2019

Net Loss per Share

Schedule of calculation of basic and diluted net loss per share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Numerator (basic and diluted):
Net loss	$	(6,529)	$	(29,026)	$	(17,508)	$	(47,120)
Denominator (basic and diluted):
Weighted average shares of common stock outstanding, basic and diluted		20,482,032		18,956,445		20,433,564		18,873,297
Net loss per share, basic and diluted	$	(0.32)	$	(1.53)	$	(0.86)	$	(2.50)

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

	June 30,
	2019	2018
Stock options to purchase common stock	2,948,279	2,602,641
Unvested restricted stock	1,445,817	1,061,879
Common stock warrants	4,646,393	—
Contingently issuable shares	5,000	154,150
	9,045,489	3,818,670