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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Allowance Recorded $ 0 $ 0 $ 0
Amounts classified as restricted cash $ 404,850 $ 404,850 $ 582,171
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 116,270