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Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 587,885	$ 71,360
Gross Unrealized Holding Gains	238	1,252
Gross Unrealized Holding Losses	(159)	(46)
Fair Value	587,964	72,566
US treasury notes and bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	467,296
Gross Unrealized Holding Gains	109
Gross Unrealized Holding Losses	(69)
Fair Value	467,336
Term deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80,000
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	0
Fair Value	80,000
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,000
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	(90)
Fair Value	29,910
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		53,985
Gross Unrealized Holding Gains		4
Gross Unrealized Holding Losses		(46)
Fair Value		53,943
Bond and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,464	17,249
Gross Unrealized Holding Gains	20	1,153
Gross Unrealized Holding Losses	0	0
Fair Value	10,484	18,402
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125	126
Gross Unrealized Holding Gains	109	95
Gross Unrealized Holding Losses	0	0
Fair Value	$ 234	$ 221

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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