Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Parenthetical) (Detail)

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Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Parenthetical) (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Jul. 27, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Exercise price of stock warrants $ 9.60 $ 9.60
Class of warrant or rights date from which warrants or rights expiration date Oct. 14, 2015  
Municipal bonds-tax exempt [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Par value of bond $ 700,000  
Amortized value 700,000  
Useful remaining life intangible assets 5 years 23 days  
Equity security [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of equity securities 2  
Purchases, Issuances and Settlement 450,000  
Discount rate 10.50%  
Security One [Member] | Equity security [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases, Issuances and Settlement 250,000  
Security Two [Member] | Equity security [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Purchases, Issuances and Settlement $ 200,000