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Fair Value Measurements (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 05, 2015 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 22, 2018 | Nov. 01, 2016
Estimate of Fair Value Measurement | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | $ 4,228,000 |  | $ 5,407,000 |  |  |  |
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 10,400,000 |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement | FreshTemp | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  | $ 1,300,000
Estimate of Fair Value Measurement | TempAlert | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | 0 |  |  |  |  |  |
Estimate of Fair Value Measurement | Accelerated Concepts | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  | $ 2,300,000 |
Estimate of Fair Value Measurement | Opengear | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | 4,200,000 |  |  |  |  |  |
Change in fair value of contingent consideration |  |  | (128,000) |  | 1,190,000 | $ 1,377,000 |  |  |
Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | 4,228,000 |  | 5,407,000 | 10,065,000 |  |  |
Contingent consideration on acquired business | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  | 4,228,000 |  | 5,407,000 |  |  |  |
Bluenica Corporation |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Contingent Liability, Payout Period | 4 years |  |  |  |  |  |  |  |
Bluenica Corporation | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  | $ 2,900,000 |  | 2,200,000 | $ 0 | $ 500,000 |  |
FreshTemp | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  | 200,000 |  |  |  |
TempAlert | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  | $ 0 |  |  |  |  |
Accelerated Concepts | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  | $ 2,400,000 |  |  | $ 3,500,000 |  |  |  |
Opengear | Maximum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  |  | 72.00% |  |  |  |  |  |
Opengear | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  | $ 900,000 |  |  |  |  |  |  |

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