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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	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 94,170	$ 150,017
Gross Unrealized Holding Gains	1,212	439
Gross Unrealized Holding Losses	(16)	(49)
Fair Value	95,366	150,407
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	75,826	126,550
Gross Unrealized Holding Gains	62	182
Gross Unrealized Holding Losses	(16)	(49)
Fair Value	75,872	126,683
Certificate of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,036	1,037
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Fair Value	1,036	1,037
Bond and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,182	22,305
Gross Unrealized Holding Gains	1,069	157
Gross Unrealized Holding Losses	0	0
Fair Value	18,251	22,462
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	126	125
Gross Unrealized Holding Gains	81	100
Gross Unrealized Holding Losses	0	0
Fair Value	$ 207	$ 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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

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
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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