Net Income Per Share - Reconciliation used in Computing Basic and Diluted Net Income per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 1,073	$ 599	$ 3,106	$ 2,752
Denominator:
Shares used in computation of basic net income per share (weighted average common shares outstanding)	28,505	28,558	28,420	28,047
Dilutive potential common shares:
Restricted Stock and RSUs	188	302	262	333
Stock options	658	793	673	825
Shares used in computation of diluted net income per share	29,351	29,653	29,355	29,205
Basic net income per share	$ 0.04	$ 0.02	$ 0.11	$ 0.10
Diluted net income per share	$ 0.04	$ 0.02	$ 0.11	$ 0.09