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Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 71,360	$ 150,017
Gross Unrealized Holding Gains	1,252	439
Gross Unrealized Holding Losses	(46)	(49)
Fair Value	72,566	150,407
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,985	126,550
Gross Unrealized Holding Gains	4	182
Gross Unrealized Holding Losses	(46)	(49)
Fair Value	53,943	126,683
Certificate of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,037
Gross Unrealized Holding Gains		0
Gross Unrealized Holding Losses		0
Fair Value		1,037
Bond and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,249	22,305
Gross Unrealized Holding Gains	1,153	157
Gross Unrealized Holding Losses	0	0
Fair Value	18,402	22,462
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	126	125
Gross Unrealized Holding Gains	95	100
Gross Unrealized Holding Losses	0	0
Fair Value	$ 221	$ 225

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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