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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Assets:
Assets at fair value	$ 39,481	$ 34,059
Liabilities:
Acquisition-related contingent consideration	3,120	354
Total liabilities at fair value	3,120	354
Quoted Prices in Active Markets (Level 1)
Assets:
Assets at fair value	11,005	3,894
Liabilities:
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Assets at fair value	28,476	30,165
Liabilities:
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Assets at fair value	0	0
Liabilities:
Acquisition-related contingent consideration	3,120	354
Total liabilities at fair value	3,120	354
Short-term investments
Assets:
Assets at fair value	31,999	30,279
Short-term investments | U.S. Treasury
Assets:
Assets at fair value	7,340	3,894
Short-term investments | Corporate debt securities | Financial
Assets:
Assets at fair value	4,890	3,041
Short-term investments | Corporate debt securities | Industrial
Assets:
Assets at fair value	9,918	9,503
Short-term investments | Commercial paper | Financial
Assets:
Assets at fair value	8,855	10,850
Short-term investments | Commercial paper | Industrial
Assets:
Assets at fair value	996	2,991
Short-term investments | Quoted Prices in Active Markets (Level 1)
Assets:
Assets at fair value	7,340	3,894
Short-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury
Assets:
Assets at fair value	7,340	3,894
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial
Assets:
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial
Assets:
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial
Assets:
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial
Assets:
Assets at fair value	0	0
Short-term investments | Significant Other Observable Inputs (Level 2)
Assets:
Assets at fair value	24,659	26,385
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury
Assets:
Assets at fair value	0	0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial
Assets:
Assets at fair value	4,890	3,041
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial
Assets:
Assets at fair value	9,918	9,503
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Financial
Assets:
Assets at fair value	8,855	10,850
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial
Assets:
Assets at fair value	996	2,991
Short-term investments | Significant Unobservable Inputs (Level 3)
Assets:
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury
Assets:
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial
Assets:
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial
Assets:
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Financial
Assets:
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial
Assets:
Assets at fair value	0	0
Long-term investments | U.S. Treasury
Assets:
Assets at fair value	3,665
Long-term investments | Corporate debt securities | Financial
Assets:
Assets at fair value	1,902	1,858
Long-term investments | Corporate debt securities | Industrial
Assets:
Assets at fair value	1,915	1,922
Long-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury
Assets:
Assets at fair value	3,665
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial
Assets:
Assets at fair value	0	0
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial
Assets:
Assets at fair value	0	0
Long-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury
Assets:
Assets at fair value	0
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial
Assets:
Assets at fair value	1,902	1,858
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial
Assets:
Assets at fair value	1,915	1,922
Long-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury
Assets:
Assets at fair value	0
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial
Assets:
Assets at fair value	0	0
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial
Assets:
Assets at fair value	$ 0	$ 0

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