Commitments And Contingencies (Narrative) (Detail) (USD $)	9 Months Ended				12 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Sales Milestone Payments [Member] Astellas [Member]	Sep. 30, 2012 201 Spear Street [Member] sqft	Sep. 30, 2012 India [Member] sqft	Dec. 31, 2011 525 Market Street [Member] Y sqft	Sep. 30, 2012 525 Market Street [Member] sqft	Sep. 30, 2012 Oakbrook Terrace [Member] sqft
Commitments And Contingencies [Line Items]
Operating lease space, in square feet			14,000	9,000	57,000	29,000	15,000
Lease expiry period			May 2013	December 2015	June 2019		December 2019
Optional lease extension term, in years					5
Tenant improvement allowance					$ 3,500,000		$ 800,000
Outstanding letters of credit collateralized by restricted cash						8,000,000	800,000
Percentage of sales milestone payments	10.00%	10.00%
Eligible to receive milestone payments		320,000,000
Coverage under its relevant insurance policies	$ 350,000