Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share

The shares in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect:

	As of March 31,
	2019		2018
Warrant		509,611		509,611
Outstanding stock options		10,261,827		4,061,068
Unvested restricted stock units		2,058,687		961,025
Total		12,830,125		5,531,704