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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Assets |  |
Total assets at fair value | $ 9,248 | $ 8,448
Liabilities |  |
Acquisition-related contingent consideration | 3,007 | 3,051
Total liabilities at fair value | 3,007 | 3,051
U.S. Treasury |  |
Assets |  |
Short-term investments | 3,696 | 3,683
Corporate debt securities | Financial |  |
Assets |  |
Short-term investments | 2,246 | 2,847
Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,922 | 1,918
Commercial paper | Financial |  |
Assets |  |
Short-term investments | 1,384 |
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Total assets at fair value | 3,696 | 3,683
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 | 3,696 | 3,683
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Assets |  |
Short-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 |
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total assets at fair value | 5,552 | 4,765
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 | 2,246 | 2,847
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Assets |  |
Short-term investments | 1,922 | 1,918
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Assets |  |
Short-term investments | 1,384 |
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Total assets at fair value | 0 | 0
Liabilities |  |
Acquisition-related contingent consideration | 3,007 | 3,051
Total liabilities at fair value | 3,007 | 3,051
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
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 |

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