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Commitments and Contingencies (Additional Information) (Detail) (USD $)	1 Months Ended	3 Months Ended
	Dec. 31, 2011 sqft	Sep. 30, 2012
Property Subject to or Available for Operating Lease [Line Items]
Number of distributors		2
Maximum civil monetary penalty		250,000
Expense related to export compliance matter		1,600,000
San Jose, California [Member]
Property Subject to or Available for Operating Lease [Line Items]
Noncancelable operating leases expiration period		Through 2017
Space for office and research and development	64,512
Rent expense under operating leases	$ 4,900,000
Lease term initiation	Apr. 01, 2012
Lease term expiration	Jun. 30, 2017