Property and Equipment (Detail) (USD $)
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6 Months Ended | 12 Months Ended | |||
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Depreciation | $ 203,670 | $ 129,965 | $ 336,885 | $ 246,331 | $ 150,710 |
Property, Plant and Equipment, Other, Gross | 861,131 | 723,975 | 173,870 | ||
Property, Plant and Equipment, Estimated Useful Lives | five | five | |||
Property, Plant and Equipment, Other, Accumulated Depreciation | $ 154,587 | $ 73,846 |
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