NET LOSS PER COMMON SHARE (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Common Shares Excluded from the Calculation of Net Loss Per Common Share

The following table sets forth for the periods presented the potential common shares (prior to consideration of the treasury stock method) excluded from the calculation of net loss per common share because their inclusion would be anti-dilutive, in thousands:

	At March 31,
	2019		2018
Options to purchase common stock		13,868		12,515
Unvested restricted common stock		717		157
		14,585		12,672