Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012
Litigation, Commitments and Contingencies Disclosure [Line Items]
Letter Of Credit Reimbursement Agreements		$ 4,700,000		$ 3,800,000
Product selling price	9,400,000
Operating Lease, Term	3 years
Upfront proceeds from financing lease obligation	3,900,000	(1,194,000)	0
Property, plant and equipment, net		39,874,000		44,327,000
Capitalized legal patent costs		7,500,000		7,500,000
Carrying Amount Of Assets Subject to Financing Lease Obligation [Member]
Litigation, Commitments and Contingencies Disclosure [Line Items]
Property, plant and equipment, net		$ 4,500,000