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Component of Current Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities Abstract    
Payroll and related expenses $ 4,538 $ 3,224
Legal expenses 396 220
Third party research and development expenses 3,207 3,903
Other accrued liabilities 1,922 812
Accrued liabilities $ 10,063 $ 8,159