Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

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Organization and Description of Business - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Mar. 17, 2014
Dec. 31, 2013
Organization And Nature Of Business [Line Items]              
Equity Method Investment Ownership Percentage         100.00%    
Long-term Investments, Total $ 250,000   $ 250,000     $ 250,000 $ 0
Payments to Acquire Short-term Investments     345,000 0      
Investment Options, Expiration Date Sep. 30, 2014   Sep. 30, 2014        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases     50,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     293,000        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 293,000 0 293,000 0      
Stock Option [Member]
              
Organization And Nature Of Business [Line Items]              
Payments to Acquire Short-term Investments     243,000        
Argus Neurooptics LLC [Member]
              
Organization And Nature Of Business [Line Items]              
Equity Method Investment Ownership Percentage           35.00%  
Nuro Pharma, Inc [Member] | Bridge Loan [Member]
              
Organization And Nature Of Business [Line Items]              
Financing Receivable, Recorded Investment, Current           $ 50,000  
Loans Receivable Interest Rate         8.00%