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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 1,436 $ 319 $ 2,070 $ 591
Shares outstanding:        
Weighted-average common shares outstanding (in shares) 22,964 22,867 22,978 22,866
Additional dilutive common stock equivalents (in shares) 160 162 86 92
Diluted shares outstanding (in shares) 23,124 23,029 23,064 22,958
Net income per share - basic (in dollars per share) $ 0.06 $ 0.01 $ 0.09 $ 0.03
Net income per share - diluted (in dollars per share) $ 0.06 $ 0.01 $ 0.09 $ 0.03