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Income Taxes - Addional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Income Taxes Addional Information [Line Items]  
Operating Loss Carryforwards $ 23,549,000
Operating Loss Carryforwards, Expiration Dates 2021-2028
Limitations On Use Operating Loss Carryforwards $ 10,200,000