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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Assets |  |
Short-term investments | $ 18,271 | $ 16,502
Total assets at fair value | 25,076 | 18,054
Liabilities |  |
Acquisition-related contingent consideration | 1,642 | 1,601
Total liabilities at fair value | 1,642 | 1,601
U.S. Treasury |  |
Assets |  |
Short-term investments | 5,219 | 4,242
Long-term investments | 4,034 | 1,101
Asset-backed securities |  |
Assets |  |
Short-term investments | 801 |
Long-term investments | 2,117 |
Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 2,954 | 2,503
Long-term investments | 654 | 451
Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,372 | 1,371
Commercial paper | Financial |  |
Assets |  |
Short-term investments | 5,334 | 5,560
Commercial paper | Industrial |  |
Assets |  |
Short-term investments | 2,591 | 2,826
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Short-term investments | 5,219 | 4,242
Total assets at fair value | 9,253 | 5,343
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 | 5,219 | 4,242
Long-term investments | 4,034 | 1,101
Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 |
Long-term investments | 0 |
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Assets |  |
Short-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 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Short-term investments | 13,052 | 12,260
Total assets at fair value | 15,823 | 12,711
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
Long-term investments | 0 | 0
Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets |  |
Short-term investments | 801 |
Long-term investments | 2,117 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 2,954 | 2,503
Long-term investments | 654 | 451
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,372 | 1,371
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Assets |  |
Short-term investments | 5,334 | 5,560
Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Assets |  |
Short-term investments | 2,591 | 2,826
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Short-term investments | 0 | 0
Total assets at fair value | 0 | 0
Liabilities |  |
Acquisition-related contingent consideration | 1,642 | 1,601
Total liabilities at fair value | 1,642 | 1,601
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 |
Long-term investments | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Assets |  |
Short-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 | $ 0

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