Net (loss) income per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net (loss) income	$ (2,729)	$ 68
Basic:
Shares outstanding at beginning of period (in shares)			16,041,000	15,949,000
Weighted average shares issued during the period, net (in shares)	3,000
Weighted average shares (repurchased) during the period, net (in shares)		(1,000)
Weighted average common shares, basic (in shares)	16,044,000	15,948,000
Net (loss) income from continuing operations per common share, basic (in dollars per shares)	$ (0.17)	$ 0.00
Diluted:
Weighted average common shares, basic (in shares)	16,044,000	15,948,000
Dilutive impact of stock options and restricted stock awards (in shares)	0	338,000
Weighted average common shares, diluted (in shares)	16,044,000	16,286,000
Net (loss) income from continuing operations per common share, diluted (in dollars per share)	$ (0.17)	$ 0.00
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding (in shares)	486,000	0