Annual report pursuant to section 13 and 15(d)

Future Minimum Payment Obligations under Operating Leases (Detail)

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Future Minimum Payment Obligations under Operating Leases (Detail) (USD $)
Dec. 31, 2012
Leases Future Minimum Payments [Line Items]  
2013 $ 394,546
2014 331,297
2015 187,100
2016 5,256
2017 4,380
Total future payment obligations $ 922,579