Balance Sheet Components - Activities of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 9,466	$ 6,640	$ 3,716
Provision for allowance for doubtful accounts	5,037	7,093	5,819
Net write-offs	(3,438)	(3,825)	(2,833)
Impact of foreign currency exchange	(713)	(442)	(62)
Ending Balance	$ 10,352	$ 9,466	$ 6,640