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Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accrued Liabilities Current [Abstract]    
Payroll and related benefits $ 4,395 $ 5,827
Royalties 2,163 4,374
Professional fees 1,043 749
Other 1,765 2,082
Accrued Expenses, Total $ 9,366 $ 13,032