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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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