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v3.20.2

Acquisitions Details (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 13, 2019 USD ($) | Jan. 22, 2018 USD ($) | Oct. 20, 2017 USD ($) | Apr. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  | $ (128,000) |  | $ 1,190,000 | $ 1,377,000 |
Operating lease right-of-use assets |  |  |  |  |  | $ 0 | 14,334,000 |  | 0 |  |
Operating lease liabilities |  |  |  |  |  | 0 | 16,193,000 |  | 0 |  |
Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing | $ 148,058,000 |  |  |  |  |  |  |  |  |  |
Weighted average useful life identifiable intangibles | 13 years 4 months 24 days |  |  |  |  |  |  |  |  |  |
Opengear | General and Administrative |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | 300,000 | $ 2,700,000 |  |  |  |
Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  | $ 16,400,000 |  |  |  |  |  |  |  |  |
Cash acquired |  | $ 200,000 |  |  |  |  |  |  |  |  |
Earn-out payment installment period |  | 2 |  |  |  |  |  |  |  |  |
TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid at closing |  |  | $ 40,700,000 |  |  |  |  |  |  |  |
Cash acquired |  |  | $ 600,000 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles |  |  |  |  |  |  | 14 years 6 months |  |  |  |
Earn-out payments | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  | $ 6,500,000 |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Earn-out payments | Maximum | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |
Earn-out payments | Maximum | Forecast | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0
Customer Relationships | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles | 14 years 6 months |  |  |  |  |  |  |  |  |  |
Purchased and Core Technology | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles | 9 years |  |  |  |  |  |  |  |  |  |
Trademarks | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life identifiable intangibles | 12 years |  |  |  |  |  |  |  |  |  |
Other non-current assets | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets | $ 1,400,000 |  |  |  |  |  |  |  |  |  |
Other current liabilities and other non-current liabilities | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities | $ 1,700,000 |  |  |  |  |  |  |  |  |  |
Contingent Consideration | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  | $ 900,000 |  |  |  |  |  |
Contingent Consideration | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  | $ 2,400,000 |  |  |  | 3,500,000 |  |
Contingent Consideration | TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  | $ 0 |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  | $ 5,407,000 | $ 4,228,000 |  | $ 5,407,000 |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | Opengear |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  | 4,200,000 |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | Accelerated Concepts |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 2,300,000 |  |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | TempAlert |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  | $ 0 |  |  |  |

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