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Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Assets:  
Fair value measurement disclosure $ 22,709
U.S. Treasury bills and money market funds
 
Assets:  
Fair value measurement disclosure 22,051
Restricted cash
 
Assets:  
Fair value measurement disclosure 658
Fair Value, Inputs, Level 1
 
Assets:  
Fair value measurement disclosure 22,709
Fair Value, Inputs, Level 1 | U.S. Treasury bills and money market funds
 
Assets:  
Fair value measurement disclosure 22,051
Fair Value, Inputs, Level 1 | Restricted cash
 
Assets:  
Fair value measurement disclosure $ 658