Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
Fair value of guarantees required to be recorded as a liability	$ 0	$ 0		$ 0
Product selling price	9,400,000
Upfront proceeds from financing lease obligation	3,900,000	3,863,000	0
Operating lease term	3
Property, plant and equipment, net	47,025,000	47,025,000		47,086,000
Capitalized legal patent costs	7,500,000	7,500,000		7,400,000
Purchase Commitment Agreement
Commitments and Contingencies Disclosure [Line Items]
Engineering fees	100,000	2,000,000
Carrying Amount Of Assets Subject to Financing Lease Obligation [Member]
Commitments and Contingencies Disclosure [Line Items]
Property, plant and equipment, net	$ 6,000,000	$ 6,000,000