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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
ft²
Oct. 31, 2013
GBP (£)
Mar. 31, 2013
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Commitment And Contingencies [Line Items]              
Proceeds from the issuance of industrial revenue bonds         $ 5,000,000    
Period of maturity         2014-08    
Proceeds from sale of property, plant and equipment $ 149,000       $ 168,713 $ 3,500 $ 38,500
Deferred rent under sublease agreement         132,338 85,925  
Pilot Manufacturing Facility [Member]              
Commitment And Contingencies [Line Items]              
Facility square-feet | ft² 21,000            
Cell Processing Facility [Member]              
Commitment And Contingencies [Line Items]              
Facility square-feet | ft² 3,000            
BMR-Gateway Boulevard LLC [Member]              
Commitment And Contingencies [Line Items]              
Term of lease       11 years 6 months      
Rent over term of lease       $ 17,869,000      
Deferred rent under sublease agreement         1,372,000 1,434,000  
Prologis, L.P [Member]              
Commitment And Contingencies [Line Items]              
Term of lease     10 years        
Rent over term of lease     $ 3,497,000        
Deferred rent under sublease agreement         $ 382,000 $ 391,000  
Stem Cell Sciences (U.K.) Ltd [Member]              
Commitment And Contingencies [Line Items]              
Term of lease   3 years          
Rental payments under the existing lease | £   £ 53,000          
Lease termination date         Oct. 31, 2015