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Research and Development Expenses Related to License Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Licensing, milestone and license maintenance fees $ 150us-gaap_CostOfServicesLicensesAndMaintenanceAgreements $ 1,055us-gaap_CostOfServicesLicensesAndMaintenanceAgreements