Net Income Per Share - Reconciliation used in Computing 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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income	$ 1,595	$ 169	$ 1,536	$ 2,033
Denominator:
Shares used in computation of basic net income per share (weighted average common shares outstanding)	28,070	28,383	27,944	28,376
Dilutive potential common shares: Restricted Stock and RSUs (in shares)	155	159	222	273
Dilutive potential common shares: Stock options (in shares)	681	668	613	681
Shares used in computation of diluted net income per share	28,906	29,210	28,779	29,330
Basic net income per share	$ 0.06	$ 0.01	$ 0.05	$ 0.07
Diluted net income per share	$ 0.06	$ 0.01	$ 0.05	$ 0.07