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Fair Value Measurements - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent consideration liability, current | $ 11,708,000 | $ 1,750,000
Payment of contingent consideration obligations | 925,000 |
Transfers in or out Level 3, Assets | 0 | 0
Transfers in or out Level 3, Liabilities | 0 | 0
Transfers out of Level 1 to Level 2, Assets | 0 | 0
Transfers into Level 1 out of Level 2, Assets | 0 | 0
Transfers out of Level 1 to Level 2, Liabilities | 0 | 0
Transfers into Level 1 out of Level 2, Liabilities | $ 0 | 0
Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Percentage of Probability Not Achieved of Contingent Consideration payment. | 0.00% |
Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Percentage of Probability Not Achieved of Contingent Consideration payment. | 90.00% |
Contingent Consideration [Member] | Minimum [Member] | Non Revenue Based Milestones [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement inputs | 2.3 |
Contingent Consideration [Member] | Maximum [Member] | Non Revenue Based Milestones [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement inputs | 4.5 |
NorMedix [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Payment of contingent consideration obligations | $ 900,000 |
NorMedix [Member] | Contingent Consideration [Member] | Revenue Based Milestones [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement inputs | 23.0 |
Level 3 Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent consideration liability, current | $ 11,700,000 | $ 1,800,000

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