Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings per share [Abstract]
Net loss	$ (4,013)	$ (2,206)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)	9,886	8,948
Add: Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method (in shares)	0	0
Diluted: Weighted average common and common equivalent shares outstanding (in shares)	9,886	8,948
Net loss per common share [Abstract]
Basic (in dollars per share)	$ (0.41)	$ (0.25)
Diluted (in dollars per share)	$ (0.41)	$ (0.25)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)	943	705