Loss Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Loss Per Share

13. LOSS PER SHARE

The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share for the periods presented due to their anti-dilutive effect:

	For the Three Months Ended March 31
	2019		2018
Shares issuable upon exercise of stock options		6,576,816		4,814,568
Non-vested shares under restricted stock grants		516,875		199,375