The Company and Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Basic And Diluted [Abstract]
Net income	$ 5,717	$ 5,241	$ 7,987	$ 10,525
Denominator:
Weighted average common shares outstanding, basic	89,134,412	87,832,430	89,015,934	87,682,734
Basic earnings per share:
Net income per share, basic	$ 0.06	$ 0.06	$ 0.09	$ 0.12
Net income	$ 5,717	$ 5,241	$ 7,987	$ 10,525
Denominator:
Weighted average common shares outstanding, basic	89,134,412	87,832,430	89,015,934	87,682,734
Dilutive securities:
Stock options and restricted stock units	2,006,184	2,259,305	2,020,419	2,406,945
Weighted average common shares outstanding, diluted	91,140,596	90,091,735	91,036,353	90,089,679
Diluted earnings per share:
Net income per share, diluted	$ 0.06	$ 0.06	$ 0.09	$ 0.12