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Computation of Earnings per Share - Summary of net income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 1,229	$ 1,573	$ 1,863	$ 3,643
Shares outstanding:
Weighted-average common shares outstanding (in shares)	21,679	22,847	21,900	22,934
Additional dilutive common stock equivalents (in shares)	79	92	67	62
Diluted shares outstanding (in shares)	21,758	22,939	21,967	22,996
Net income per share - basic (in dollars per share)	$ 0.06	$ 0.07	$ 0.09	$ 0.16
Net income per share - diluted (in dollars per share)	$ 0.06	$ 0.07	$ 0.08	$ 0.16

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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