Net Loss Per Common Share (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potentially dilutive securities have been excluded from the computations of diluted weighted average shares outstanding as they would be anti-dilutive:

	March 31,
	2019		2018
Shares underlying warrants outstanding		6,642,344		7,099,010
Shares underlying options outstanding		7,495,128		6,474,527
Unvested restricted stock		444,313		753,528

The following securities have been excluded from the dilutive per share computation as they are antidilutive:

	December 31,
	2018		2017
Shares underlying options outstanding		7,434,561		6,770,777
Shares underlying warrants outstanding		6,642,344		7,099,010
Unvested restricted stock		449,043		799,387