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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | $ 26,947 | $ 26,815
Acquisition-related contingent consideration | 311 | 252
Total liabilities at fair value | 311 | 252
Quoted Prices in Active Markets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 11,395 | 12,915
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 15,552 | 13,900
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Acquisition-related contingent consideration | 311 | 252
Total liabilities at fair value | 311 | 252
Short-term investments |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 23,051 | 24,863
Short-term investments | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 9,997 | 12,915
Short-term investments | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,492 | 3,963
Short-term investments | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 5,867 | 4,445
Short-term investments | Commercial paper | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,695 | 2,843
Short-term investments | Commercial paper | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 697
Short-term investments | Quoted Prices in Active Markets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 9,997 | 12,915
Short-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 9,997 | 12,915
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 0
Short-term investments | Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 13,054 | 11,948
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,492 | 3,963
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 5,867 | 4,445
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,695 | 2,843
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 697
Short-term investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 0
Long-term investments | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,398 |
Long-term investments | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 502
Long-term investments | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,498 | 1,450
Long-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,398 |
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 0
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Long-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 502
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,498 | 1,450
Long-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury, short-term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 0
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | $ 0 | $ 0

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