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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income	$ 169	$ 466	$ 2,033	$ 2,153
Denominator:
Shares used in computation of basic net income per share (weighted average common shares outstanding)	28,383	28,146	28,376	27,787
Dilutive potential common shares:
Shares used in computation of diluted net income per share	29,210	29,293	29,330	28,912
Basic net income per share	$ 0.01	$ 0.02	$ 0.07	$ 0.08
Diluted net income per share	$ 0.01	$ 0.02	$ 0.07	$ 0.07
Restricted Stock and RSUs [Member]
Dilutive potential common shares:
Dilutive potential common stocks	159	272	273	323
Stock Options [Member]
Dilutive potential common shares:
Dilutive potential common stocks	668	875	681	802