Balance Sheet Components - Activities of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 15,950	$ 18,228	$ 15,675
Provision for allowance for doubtful accounts	8,459	7,236	5,627
Net write-offs	(11,341)	(8,396)	(4,546)
Impact of foreign currency exchange	(42)	(1,118)	1,472
Ending Balance	$ 13,026	$ 15,950	$ 18,228