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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - HIV - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
May 31, 2013
Oct. 31, 2009
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Receivables from sale against the grant funded to entity from sale of product     Two times the amount Sangamo receives in funding under the agreement    
California Institute for Regenerative Medicine [Member]
          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Funds due under the agreement $ 6.4 $ 14.5      
Agreement to receive 4 years 4 years      
Expected amount to be received for research and development   5.2      
Agreement date   Oct. 31, 2009      
Collaboration agreement related costs and expenses     1.8 1.2 2.0
California Institute for Regenerative Medicine [Member] | License agreement terms [Member]
          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Revenues under agreement     1.2 1.2 1.7
California Institute for Regenerative Medicine [Member] | License agreement terms [Member] | Therapeutic for beta-thalassemia [Member]
          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Revenues under agreement     0.1    
Collaboration agreement related costs and expenses     $ 0.4