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Summary of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 94,441	$ 33,457
Gross Unrealized Gain	12,041
Gross Unrealized Loss	(8)	(31)
Fair Value	106,474	33,426
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,588	3,912
Fair Value	18,588	3,912
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,995	3,427
Gross Unrealized Gain	9
Gross Unrealized Loss		(1)
Fair Value	62,004	3,426
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,858	26,118
Gross Unrealized Loss	(8)	(30)
Fair Value	13,850	$ 26,088
Aduro equity securities
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Gain	12,032
Fair Value	$ 12,032

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

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