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Investments - Summary of Fair Values of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | $ 16,502 | $ 8,448
Total assets at fair value | 18,054 | 8,448
Acquisition-related contingent consideration | 1,601 | 3,051
Total liabilities at fair value | 1,601 | 3,051
U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 4,242 | 3,683
Long-term investments at fair value | 1,101 |
Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,503 | 2,847
Long-term investments at fair value | 451 | 0
Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 1,371 | 1,918
Long-term investments at fair value |  | 0
Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 5,560 | 0
Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,826 | 0
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 4,242 | 3,683
Total assets at fair value | 5,343 | 3,683
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 4,242 | 3,683
Long-term investments at fair value | 1,101 |
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value |  | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 12,260 | 4,765
Total assets at fair value | 12,711 | 4,765
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value | 0 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,503 | 2,847
Long-term investments at fair value | 451 | 0
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 1,371 | 1,918
Long-term investments at fair value |  | 0
Significant Other Observable Inputs (Level 2) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 5,560 | 0
Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 2,826 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Total assets at fair value | 0 | 0
Acquisition-related contingent consideration | 1,601 | 3,051
Total liabilities at fair value | 1,601 | 3,051
Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Long-term investments at fair value |  | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments at fair value | $ 0 | $ 0

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