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
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share Basic And Diluted [Abstract]
Net income	$ 2,618	$ 2,270
Denominator:
Weighted average common shares outstanding, basic	90,236,476	88,897,456
Basic earnings per share:
Net income per share, basic	$ 0.03	$ 0.03
Denominator:
Weighted average common shares outstanding, basic	90,236,476	88,897,456
Dilutive securities:
Stock options and restricted stock units	1,524,055	2,034,653
Weighted average common shares outstanding, diluted	91,760,531	90,932,109
Diluted earnings per share:
Net income per share, diluted	$ 0.03	$ 0.02