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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, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 140,643	$ 158,816
Gross Unrealized Holding Gains	383	331
Gross Unrealized Holding Losses	(179)	(514)
Estimated Fair Value	140,847	158,633
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	132,302	158,692
Gross Unrealized Holding Gains	316	254
Gross Unrealized Holding Losses	(179)	(514)
Estimated Fair Value	132,439	158,432
Certificate of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,217
Gross Unrealized Holding Gains	5
Estimated Fair Value	8,222
Equity investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	124	124
Gross Unrealized Holding Gains	62	77
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	$ 186	$ 201

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

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