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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, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 150,017	$ 159,917
Gross Unrealized Holding Gains	439	125
Gross Unrealized Holding Losses	(49)	(475)
Fair Value	150,407	159,567
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	126,550	126,522
Gross Unrealized Holding Gains	182	54
Gross Unrealized Holding Losses	(49)	(473)
Fair Value	126,683	126,103
Certificate of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,037	8,217
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	(2)
Fair Value	1,037	8,215
Bond and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,305	25,052
Gross Unrealized Holding Gains	157	0
Gross Unrealized Holding Losses	0	0
Fair Value	22,462	25,052
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125	126
Gross Unrealized Holding Gains	100	71
Gross Unrealized Holding Losses	0	0
Fair Value	$ 225	$ 197

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
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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