Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (3,289)	$ (4,705)
Weighted average number of common shares outstanding (basic) (in shares)	45,984	44,924
Weighted average number of common shares outstanding (diluted) (in shares)	45,984	44,924
Net loss per share (basic) (in USD per share)	$ (0.07)	$ (0.10)
Net loss per share (diluted) (in USD per share)	$ (0.07)	$ (0.10)
Service-based stock options
Anti-dilutive shares excluded from the calculation of diluted earnings per share(a) (amounts in millions):
Aggregate number of common equivalent shares (related to options, warrants and preferred stock) that have been excluded from computations of diluted net loss per common share (in shares)	6,200	6,200
Restricted Stock Units (RSUs)
Anti-dilutive shares excluded from the calculation of diluted earnings per share(a) (amounts in millions):
Aggregate number of common equivalent shares (related to options, warrants and preferred stock) that have been excluded from computations of diluted net loss per common share (in shares)	400	300