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Major Category of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring
$ in Thousands
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets $ 31,984
Liabilities 4,819
Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 9,543
U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 12,508
Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 9,933
Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 4,454
Contingent consideration - long-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 365
Quoted prices in active markets for identical assets (Level 1)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 18,039
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 9,543
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 8,496
Significant other observable inputs (Level 2)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 13,945
Significant other observable inputs (Level 2) | U.S. Government and agency securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 4,012
Significant other observable inputs (Level 2) | Corporate and other debt securities  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Assets 9,933
Significant unobservable inputs (Level 3)  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 4,819
Significant unobservable inputs (Level 3) | Contingent consideration - short-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities 4,454
Significant unobservable inputs (Level 3) | Contingent consideration - long-term  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]  
Liabilities $ 365