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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Assets |  |
Short-term investments | $ 40,238 | $ 40,035
Total assets at fair value | 45,835 | 41,998
Liabilities |  |
Acquisition-related contingent consideration | 790 | 753
Total liabilities at fair value | 790 | 753
U.S. Treasury |  |
Assets |  |
Short-term investments | 9,571 | 10,283
Long-term investments | 2,745 | 0
Asset-backed securities |  |
Assets |  |
Short-term investments | 3,935 | 4,759
Long-term investments | 962 |
Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 6,387 | 7,695
Long-term investments | 0 | 977
Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,913 | 1,924
Long-term investments | 1,890 | 986
Commercial paper | Financial |  |
Assets |  |
Short-term investments | 12,488 | 13,479
Commercial paper | Industrial |  |
Assets |  |
Short-term investments | 5,944 | 1,895
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Short-term investments | 9,571 | 10,283
Total assets at fair value | 12,316 | 10,283
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 | 9,571 | 10,283
Long-term investments | 2,745 | 0
Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 | 0
Long-term investments | 0 |
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets |  |
Short-term investments |  | 0
Long-term investments |  | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments |  | 0
Long-term investments |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Assets |  |
Short-term investments |  | 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 | 30,667 | 29,752
Total assets at fair value | 33,519 | 31,715
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 | 3,935 | 4,759
Long-term investments | 962 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 6,387 | 7,695
Long-term investments | 0 | 977
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,913 | 1,924
Long-term investments | 1,890 | 986
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Assets |  |
Short-term investments | 12,488 | 13,479
Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Assets |  |
Short-term investments | 5,944 | 1,895
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Short-term investments | 0 | 0
Total assets at fair value | 0 | 0
Liabilities |  |
Acquisition-related contingent consideration | 790 | 753
Total liabilities at fair value | 790 | 753
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 | 0
Long-term investments | 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
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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