Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Potentially Dilutive Securities Outstanding Excluded from Diluted Loss Per Share Calculation

The following potentially dilutive securities outstanding as of December 31, 2018, 2017 and 2016 have been excluded from the denominator of the diluted loss per share of common stock outstanding calculation (in thousands):

	December 31,
	2018		2017		2016
Stock options		2,711		2,444		1,826
Non-vested restricted stock awards		4		16		22
Non-vested restricted stock units		43		-		-
Convertible preferred stock warrants		-		105		64
Common stock warrants		105		-		-
Shares of convertible preferred stock “as-converted”		-		10,994		9,594