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Changes in Warrant Liabilities (Detail) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
May 21, 2008
Jun. 30, 2008
Dec. 31, 2011
Warranty Liability [Line Items]      
Beginning Balance     $ 861,000
Change in fair value of warrant liabilities 100,000 356,000 524,000
Intrinsic value of liability warrants exercised     $ (1,385)