Earnings Per Share - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 1	$ 1,501	$ 2,544	$ 1,035	$ 1,502	$ 3,579
Denominator:
Denominator for basic earnings per share – weighted average shares (in shares)	8,554		8,205		8,479	8,141
Effect of dilutive securities:
Employee restricted stock and incentive stock options (in shares)	13		22		19	26
Denominator for diluted earnings (loss) per share – adjusted weighted average shares and assumed conversion (in shares)	8,567		8,227		8,498	8,167
Basic earnings per share (in usd per share)	$ 0.00		$ 0.31		$ 0.18	$ 0.44
Diluted earnings per share (in usd per shares)	$ 0.00		$ 0.31		$ 0.18	$ 0.44
Weighted average anti-dilutive employee restricted stock and incentive stock options (in shares)	509		99		364	61