Net Loss Per Share (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Numerator:
Net loss	$	(18,680	)	$	(15,767	)	$	(38,131	)	$	(31,110	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		49,267,247			39,483,006			47,206,480			37,954,972
Net loss per share- basic and diluted	$	(0.38	)	$	(0.40	)	$	(0.81	)	$	(0.82	)

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 June 30,				Six Months Ended June 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		9,432,575		8,870,004		9,432,575		8,870,004
		11,067,625		10,505,054		11,067,625		10,505,054