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Patent Licenses - Additional Information (Detail)
12 Months Ended
Feb. 07, 2013
Installment
May 14, 2004
USD ($)
Feb. 13, 2004
USD ($)
Dec. 31, 2003
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Option and license fees   $ 400,000 $ 22,500 $ 340,000    
Patents and patent licenses         $ 3,530,000  
UMass IP [Member]            
Finite-Lived Intangible Assets [Line Items]            
Option and license fees         75,000 $ 75,000
Obligation to pay royalties (Ranged) 0.25%          
Minimum annual license fee         150,000 $ 75,000
Number of installments | Installment 2          
UMass IP [Member] | Minimum [Member] | Previously Reported [Member]            
Finite-Lived Intangible Assets [Line Items]            
Obligation to pay royalties (Ranged) 6.00%          
UMass IP [Member] | Maximum [Member] | Previously Reported [Member]            
Finite-Lived Intangible Assets [Line Items]            
Obligation to pay royalties (Ranged) 12.00%          
Ocata IP [Member]            
Finite-Lived Intangible Assets [Line Items]            
Patents and patent licenses         $ 747,000