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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring
$ in Thousands
Dec. 31, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 32,000
Liabilities 6,788
Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 12,685
U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 7,858
Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 11,457
Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 4,480
Contingent consideration - long-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 2,308
Quoted prices in active markets for identical assets (Level 1)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 20,141
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 12,685
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 7,456
Significant other observable inputs (Level 2)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 11,859
Significant other observable inputs (Level 2) | U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 402
Significant other observable inputs (Level 2) | Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 11,457
Significant unobservable inputs (Level 3)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 6,788
Significant unobservable inputs (Level 3) | Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 4,480
Significant unobservable inputs (Level 3) | Contingent consideration - long-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities $ 2,308