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Debt - Additional Information (Detail)
Feb. 26, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 01, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 09, 2013
USD ($)
minority_shareholder
Line Of Credit Facility [Line Items]          
Number of minority shareholders | minority_shareholder         1
Line of credit outstanding amount   $ 1,320,000   $ 500,000  
Line of credit outstanding amount, excluding current maturities   0   0  
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  
Line of credit outstanding amount   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      
Line of credit outstanding amount, excluding current maturities   $ 800,000      
Subsequent event | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Venture Bank          
Line Of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000.0        
Debt Instrument, Basis Spread on Variable Rate 2.00%