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Calculation of Basic and Diluted Net Income Per Share (Detail) - 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
Numerator:        
Net income $ 2,711 $ 168 $ 4,511 $ 654
Denominator (in thousands):        
Basic weighted-average common stock outstanding 20,604 20,564 20,562 20,491
Effect of stock -based awards 767 420 587 480
Diluted weighted average common stock outstanding 21,371 20,984 21,149 20,971
Basic net income per share $ 0.13 $ 0.01 $ 0.22 $ 0.03
Diluted net income per share $ 0.13 $ 0.01 $ 0.21 $ 0.03