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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share Basic And Diluted [Abstract]
Net income	$ 5,415	$ 9,293	$ 13,402	$ 19,818
Denominator:
Weighted average common shares outstanding, basic	89,590,135	88,090,143	89,208,732	87,820,029
Basic earnings per share:
Net income per share, basic	$ 0.06	$ 0.11	$ 0.15	$ 0.23
Net income	$ 5,415	$ 9,293	$ 13,402	$ 19,818
Denominator:
Weighted average common shares outstanding, basic	89,590,135	88,090,143	89,208,732	87,820,029
Dilutive securities:
Stock options and restricted stock units	1,899,840	2,333,190	1,980,226	2,382,360
Weighted average common shares outstanding, diluted	91,489,975	90,423,333	91,188,958	90,202,389
Diluted earnings per share:
Net income per share, diluted	$ 0.06	$ 0.10	$ 0.15	$ 0.22