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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income	$ 3,908	$ 2,711	$ 8,015	$ 4,511
Denominator (in thousands):
Basic weighted-average common stock outstanding	21,712	20,604	21,556	20,562
Effect of stock-based awards	851	767	820	587
Diluted weighted average common stock outstanding	22,563	21,371	22,376	21,149
Basic net income per share	$ 0.18	$ 0.13	$ 0.37	$ 0.22
Diluted net income per share	$ 0.17	$ 0.13	$ 0.36	$ 0.21

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Weighted Average Number Of Share Outstanding Basic And Diluted [Abstract]

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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