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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail) (California Institute for Regenerative Medicine [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2009
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
May 31, 2013
Beta-thalassemia [Member]
Jun. 30, 2014
Beta-thalassemia [Member]
Jun. 30, 2014
Beta-thalassemia [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]                
Funds due under the agreement $ 14.5         $ 6.4    
Agreement to receive 4 years         4 years    
Expected amount to be received for research and development 5.2              
Agreement date Oct. 31, 2009              
Revenues under agreement             0.3 0.7
Collaboration agreement related costs and expenses   $ 0.7 $ 0.5 $ 1.0 $ 0.9   $ 0.4 $ 0.7