Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Income (Loss) Attributable to Parent [Abstract]
Net loss	$ (7,091)	$ (3,289)
Basic weighted-average common shares outstanding (in shares)	46,985	45,984
Diluted weighted-average common shares outstanding (in shares)	46,985	45,984
Basic loss per common share (in USD per share)	$ (0.15)	$ (0.07)
Diluted loss per common share (in USD per share)	$ (0.15)	$ (0.07)
Stock options
Anti-dilutive shares excluded from diluted net loss per common share:
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)	6,479	6,183
Restricted stock units
Net Income (Loss) Attributable to Parent [Abstract]
Effect of dilutive stock options and restricted stock units	0	0
Anti-dilutive shares excluded from diluted net loss per common share:
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)	625	406