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Patent Licenses - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 07, 2013
Installment
May. 14, 2004
USD ($)
Feb. 13, 2004
USD ($)
Dec. 31, 2003
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Finite-Lived Intangible Assets [Line Items]                      
Option and license fees $ 3,604,000 $ 3,367,000   $ 400,000 $ 22,500 $ 340,000          
Patent acquisition costs 2,857,000           $ 2,857,000   $ 2,857,000    
Amortization expense             20,000 $ 16,000 52,000 $ 32,000  
Accumulated amortization 624,000 $ 572,000         624,000   624,000    
UMass IP [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
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%                
ACT IP [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Patent acquisition costs $ 747,000           $ 747,000   $ 747,000