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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Assets: |  |
Assets at fair value | $ 39,481 | $ 34,059
Liabilities: |  |
Acquisition-related contingent consideration | 3,120 | 354
Total liabilities at fair value | 3,120 | 354
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Assets at fair value | 11,005 | 3,894
Liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets at fair value | 28,476 | 30,165
Liabilities: |  |
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets at fair value | 0 | 0
Liabilities: |  |
Acquisition-related contingent consideration | 3,120 | 354
Total liabilities at fair value | 3,120 | 354
Short-term investments |  |
Assets: |  |
Assets at fair value | 31,999 | 30,279
Short-term investments | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 7,340 | 3,894
Short-term investments | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 4,890 | 3,041
Short-term investments | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 9,918 | 9,503
Short-term investments | Commercial paper | Financial |  |
Assets: |  |
Assets at fair value | 8,855 | 10,850
Short-term investments | Commercial paper | Industrial |  |
Assets: |  |
Assets at fair value | 996 | 2,991
Short-term investments | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Assets at fair value | 7,340 | 3,894
Short-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 7,340 | 3,894
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets at fair value | 24,659 | 26,385
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 4,890 | 3,041
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 9,918 | 9,503
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Assets: |  |
Assets at fair value | 8,855 | 10,850
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Assets: |  |
Assets at fair value | 996 | 2,991
Short-term investments | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial |  |
Assets: |  |
Assets at fair value | 0 | 0
Long-term investments | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 3,665 |
Long-term investments | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 1,902 | 1,858
Long-term investments | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 1,915 | 1,922
Long-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 3,665 |
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 0 | 0
Long-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 0 |
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 1,902 | 1,858
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | 1,915 | 1,922
Long-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Assets at fair value | 0 |
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Assets: |  |
Assets at fair value | 0 | 0
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Assets: |  |
Assets at fair value | $ 0 | $ 0

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