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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring
$ in Thousands
Jun. 30, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 141,120
Liabilities 130,173
Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 131,939
U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 3,929
Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,252
Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 5,878
Convertible Senior Note  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 124,295
Quoted prices in active markets for identical assets (Level 1)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 135,568
Quoted prices in active markets for identical assets (Level 1) | Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 131,939
Quoted prices in active markets for identical assets (Level 1) | U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 3,629
Significant other observable inputs (Level 2)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,552
Liabilities 124,295
Significant other observable inputs (Level 2) | U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 300
Significant other observable inputs (Level 2) | Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 5,252
Significant other observable inputs (Level 2) | Convertible Senior Note  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 124,295
Significant unobservable inputs (Level 3)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 5,878
Significant unobservable inputs (Level 3) | Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities $ 5,878