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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	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 153,904	$ 159,917
Gross Unrealized Holding Gains	634	125
Gross Unrealized Holding Losses	(75)	(475)
Estimated Fair Value	154,463	159,567
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,825	126,522
Gross Unrealized Holding Gains	529	54
Gross Unrealized Holding Losses	(75)	(473)
Estimated Fair Value	126,279	126,103
Certificate of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,241	8,217
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	(2)
Estimated Fair Value	2,241	8,215
Bond and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,712	25,052
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	25,712	25,052
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	126	126
Gross Unrealized Holding Gains	105	71
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	$ 231	$ 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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-Section 45
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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
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-Paragraph 2
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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