Annual report pursuant to section 13 and 15(d)

Minimum Future Lease Payments to be Paid Annually Under Three-Year Non-Cancellable Amended Operating Lease for Office Space (Detail)

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Minimum Future Lease Payments to be Paid Annually Under Three-Year Non-Cancellable Amended Operating Lease for Office Space (Detail) (USD $)
Dec. 31, 2012
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]  
2013 $ 23,000
2014 23,000
2015 13,000
Total $ 59,000