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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Assets: |  |
Short-term investments: | $ 19,146 | $ 30,279
Total assets at fair value | 20,085 | 34,059
Liabilities: |  |
Acquisition-related contingent consideration | 3,703 | 354
Total liabilities at fair value | 3,703 | 354
U.S. Treasury |  |
Assets: |  |
Short-term investments: | 8,624 | 3,894
Corporate debt securities | Financial |  |
Assets: |  |
Short-term investments: | 2,840 | 3,041
Long-term investments: |  | 1,858
Corporate debt securities | Industrial |  |
Assets: |  |
Short-term investments: | 5,692 | 9,503
Long-term investments: | 939 | 1,922
Commercial paper | Financial |  |
Assets: |  |
Short-term investments: | 1,990 | 10,850
Commercial paper | Industrial |  |
Assets: |  |
Short-term investments: |  | 2,991
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Short-term investments: | 8,624 | 3,894
Total assets at fair value | 8,624 | 3,894
Liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 8,624 | 3,894
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: |  | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Assets: |  |
Short-term investments: | 0 | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial |  |
Assets: |  |
Short-term investments: |  | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments: | 10,522 | 26,385
Total assets at fair value | 11,461 | 30,165
Liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Assets: |  |
Short-term investments: | 2,840 | 3,041
Long-term investments: |  | 1,858
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets: |  |
Short-term investments: | 5,692 | 9,503
Long-term investments: | 939 | 1,922
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Assets: |  |
Short-term investments: | 1,990 | 10,850
Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Assets: |  |
Short-term investments: |  | 2,991
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments: | 0 | 0
Total assets at fair value | 0 | 0
Liabilities: |  |
Acquisition-related contingent consideration | 3,703 | 354
Total liabilities at fair value | 3,703 | 354
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Short-term investments: | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: |  | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Assets: |  |
Short-term investments: | 0 | 0
Long-term investments: | 0 | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Financial |  |
Assets: |  |
Short-term investments: | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial |  |
Assets: |  |
Short-term investments: |  | $ 0

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