Commitments and Contingencies - Additional Information (Detail) (USD $)			1 Months Ended
	Jun. 30, 2013	Oct. 19, 2011 Pending Litigation [Member]	Apr. 30, 2013 Lease Agreements [Member] Palo Alto [Member]
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