Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v2.4.0.6
Related Party Transactions (Details) (USD $)
Share data in Millions, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2007
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shell [Member]
           
Related Party Transaction [Line Items]            
Term of collaborative research and development agreement (in years) 5 years          
Shells percentage of total Collaborative R&D revenue   0.00% 45.00% 51.00% 51.00% 62.00%
Collaborative research and development $ 20,000,000          
Raizen [Member]
           
Related Party Transaction [Line Items]            
Shares held by collaboration company   5.6        
Material financial activity   0        
Exela PharmaSci, Inc [Member]
           
Related Party Transaction [Line Items]            
Collaborative research and development   1,044,000 150,000      
Amounts owed   0   0