Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Net Loss Per Share [Abstract]

Basic and Diluted Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Numerator:
Net loss	$	(19,284	)	$	(16,089	)	$	(57,415	)	$	(47,199	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		50,364,649			39,900,551			48,270,771			38,598,304
Net loss per share- basic and diluted	$	(0.38	)	$	(0.40	)	$	(1.19	)	$	(1.22	)

Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The Company excluded the following potential shares of common stock, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Shares issuable upon conversion of the 2021 Convertible Notes		1,620,948		1,620,948		1,620,948		1,620,948
Warrants exercisable for common shares		14,102		14,102		14,102		14,102
Options to purchase common shares		9,608,537		8,475,802		9,608,537		8,475,802
		11,243,587		10,110,852		11,243,587		10,110,852