Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Detail)

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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]      
Additions (Deductions) Charged to (from) Income Tax Expense      
Valuation Allowance Of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Period $ (9,521,260) $ (9,147,488) $ (8,159,774)
Additions (Deductions) Charged to (from) Income Tax Expense $ (373,772) $ (987,714)  
Other Changes to Valuation Allowance      
Balance End of Period $ (9,521,260) $ (9,147,488) $ (8,159,774)