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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 02, 2021 | Nov. 13, 2018 | Jul. 27, 2018 | Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Non-current contingent consideration |  |  |  |  | $ 5,210 | $ 5,210 | $ 10,962
Cash contingent earn-out payments |  |  |  |  |  | 1,421 | 78
Contingent earn-out liability |  |  |  |  | 800 | 800 |
Change in estimated fair value of contingent consideration |  |  |  |  |  | (3,524) | 1,100
Rent expense under Operating Leases |  |  |  |  |  | 500 | 500
Future minimum lease obligations |  |  |  |  | $ 1,351 | $ 1,351 |
Maximum |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Operating lease term |  |  |  |  | 7 years | 7 years |
Quantum |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Non-current contingent consideration |  |  | $ 7,700 |  |  |  |
Contingent cash payments earn-out period |  |  | 4 years |  |  |  |
Contingent payments earn-out period ending month and year |  |  | 2022-07 |  |  |  |
Contingent payments maximum earn-out amount |  |  | $ 23,500 |  |  |  |
Cash contingent earn-out payments |  |  |  | $ 800 | $ 1,400 |  | 100
Contingent earn-out liability |  |  |  |  |  |  | $ 5,800
Change in estimated fair value of contingent consideration |  |  |  |  |  | $ (2,700) |
Quantum | CBP |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Awarded contract amount |  |  |  |  | 10,000 | 10,000 |
Optoseis Technology |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Non-current contingent consideration |  | $ 4,300 |  |  |  |  |
Contingent cash payments earn-out period |  | 5 years 6 months |  |  |  |  |
Contingent payments earn-out period ending month and year |  | 2024-05 |  |  |  |  |
Contingent payments maximum earn-out amount |  | $ 23,200 |  |  |  |  |
Contingent earn-out liability |  |  |  |  | 5,200 | 5,200 |
Change in estimated fair value of contingent consideration |  |  |  |  |  | (800) |
Estimated fair value of earn-out liability |  |  |  |  | $ 4,400 | $ 4,400 |
Aquana |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Contingent cash payments earn-out period | 6 years |  |  |  |  |  |

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