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Summary of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 91,142	$ 33,457
Gross Unrealized Gain	7,690
Gross Unrealized Loss	(11)	(31)
Fair Value	98,821	33,426
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,169	3,912
Fair Value	42,169	3,912
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,000	3,427
Gross Unrealized Gain	3
Gross Unrealized Loss		(1)
Fair Value	30,003	3,426
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,973	26,118
Gross Unrealized Gain	3
Gross Unrealized Loss	(11)	(30)
Fair Value	18,965	$ 26,088
Aduro equity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Gain	7,684
Fair Value	$ 7,684

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

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