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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income	$ 184	$ 1,073	$ 1,720	$ 3,106
Denominator:
Shares used in computation of basic net income per share (weighted average common shares outstanding)	28,190	28,505	28,027	28,420
Dilutive potential common shares: Restricted Stock and RSUs (in shares)	177	188	223	262
Dilutive potential common shares: Stock options (in shares)	767	658	643	673
Shares used in computation of diluted net income per share (in shares)	29,134	29,351	28,893	29,355
Basic net income per share (in dollars per share)	$ 0.01	$ 0.04	$ 0.06	$ 0.11
Diluted net income per share (in dollars per share)	$ 0.01	$ 0.04	$ 0.06	$ 0.11