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Patent Finance Obligation - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 13, 2014
Jun. 18, 2014
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Current portion of obligation     $ 115,000  
Patent Rights Finance Obligation, Due June 18, 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date     Jun. 18, 2023 Jun. 18, 2023
Discount rate   6.00%    
Patent Finance Obligation, Due August 18, 2018 [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date     Aug. 18, 2018 Aug. 18, 2018
Discount rate 4.50%      
Discount payment stream $ 1,389,000      
Current portion of obligation     $ 4,090,000  
Long term portion of obligation     $ 0  
Patent Finance Obligation, Due August 18, 2018 [Member] | Secured Term Debt [Member]        
Debt Instrument [Line Items]        
Secured term debt, term 5 years