Annual report pursuant to section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]    
Operating loss carryforwards $ 15,000,000 $ 13,000,000
Operating loss carryforwards, expiration dates Begin to expire in 2013