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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income $ 3,388 $ 3,309 $ 7,899 $ 3,963
Denominator (in thousands):        
Basic weighted-average common stock outstanding 21,025 20,448 20,718 20,477
Effect of stock-based awards 858 363 677 441
Diluted weighted average common stock outstanding 21,883 20,811 21,395 20,918
Basic net income per share $ 0.16 $ 0.16 $ 0.38 $ 0.19
Diluted net income per share $ 0.15 $ 0.16 $ 0.37 $ 0.19