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Debt - Additional Information (Detail)
1 Months Ended
Feb. 26, 2016
USD ($)
Aug. 05, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 01, 2015
USD ($)
Aug. 09, 2013
USD ($)
minority_shareholder
Line Of Credit Facility [Line Items]            
Number of minority shareholders | minority_shareholder           1
Short-term debt     $ 1,320,000 $ 1,320,000    
Neurone | Term Loan Credit Facility            
Line Of Credit Facility [Line Items]            
Line of credit           $ 500,000.0
Loan interest rate (as a percent)           8.00%
Fair value of line of credit     500,000 500,000    
Short-term debt     500,000 $ 500,000    
Neurone | Additional Term Loan Credit Facility            
Line Of Credit Facility [Line Items]            
Line of credit         $ 800,000.0  
Loan interest rate (as a percent)         8.00%  
Fair value of line of credit     800,000      
Short-term debt     800,000      
Venture Bank | Revolving Credit Facility            
Line Of Credit Facility [Line Items]            
Line of credit outstanding amount     $ 5,000,000      
Venture Bank | Revolving Credit Facility | LIBOR            
Line Of Credit Facility [Line Items]            
Maximum borrowing capacity $ 5,000,000.0          
Basis spread on variable rate (as a percent) 5.50%          
Subsequent Event | Venture Bank | Revolving Credit Facility            
Line Of Credit Facility [Line Items]            
Proceeds from Lines of Credit   $ 2,000,000