Commitments and Contingencies - Additional Information (Detail) (USD $)
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1 Months Ended | ||
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Jun. 30, 2013
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Oct. 19, 2011
Pending Litigation [Member]
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Apr. 30, 2013
Lease Agreements [Member]
Palo Alto [Member]
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Commitments and Contingencies Disclosure [Line Items] | |||
Operating Lease, Renewed Term | 3 years | ||
Noncancelable purchase commitments, due within one year | $ 34,500,000 | ||
Loss Contingency, Range of Possible Loss, Minimum | 10,500,000.0 | ||
Loss Contingency, Range of Possible Loss, Maximum | $ 25,000,000 |