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Derivative Financial Instruments - Changes in Fair Value Inputs and Assumptions (Detail) - Compound Embedded Derivative [Member] - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]    
Balances at January 1   $ 47,243
Issuances $ 0 0
Expirations from redemptions of host contracts reflected in income $ 0 0
Changes in fair value inputs and assumptions reflected in income   $ (47,243)