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Property and Equipment, net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 112 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Property, Plant and Equipment [Line Items]        
Depreciation and amortization $ 658 $ 268 $ 188 $ 2,574