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Derivative Financial Instruments - Changes in Fair Value Inputs and Assumptions (Detail) (Compound Embedded Derivative [Member], USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Compound Embedded Derivative [Member]
   
Derivative [Line Items]    
Beginning balance $ 47,243 $ 1,529,583
Issuances      
Expirations from redemptions of host contracts reflected in income (47,243) (437,889)
Changes in fair value inputs and assumptions reflected in income   640,563
Ending balance   $ 1,732,257