Commitments and Contingencies (Narrative) (Detail) (USD $)	0 Months Ended	6 Months Ended
	Jul. 03, 2013	Jun. 30, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Percentage royalty revenues from ex-U.S.-based manufacturing and sales (in Percent)		40.00%
Retroactive royalty rate on past U.S.-based sales to be paid by Genentech (in Percent)		3.75%
Future U.S.-based sales royalty rate to be paid by Genetech (in Percent)		3.75%
Loss Contingency, Damages Sought, Value	$ 428,751
Total lease payments for the duration of the guarantee		95,100,000
Accrued lease liability		$ 10,700,000	$ 10,700,000