Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss from continuing operations	$ (4,176)	$ (2,880)	$ (8,417)	$ (5,208)
Net loss from discontinued operations	$ (103)	$ (26)	$ (258)	$ (359)
Denominator:
Weighted-average common shares outstanding (shares)	22,763	23,283	22,687	22,930
Basic and diluted net loss per common share from discontinued operations (in usd per share)	$ (0.18)	$ (0.13)	$ (0.37)	$ (0.23)
Basic and diluted net loss per common share from discontinued operations (in usd per share)	0.00	0.00	(0.01)	(0.01)
Total basic income (loss) per common share (in usd per share)	$ (0.18)	$ (0.13)	$ (0.38)	$ (0.24)
Anti-dilutive securities awarded under equity compensation plans excluded from diluted net loss per share calculation (shares)	4,277	3,783	4,277	3,783