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Fair Value Measurements (Details) - USD ($) |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2015 | Dec. 31, 2018 | Sep. 30, 2018 | Jan. 22, 2018 | Dec. 31, 2017 | Oct. 20, 2017 | Sep. 30, 2017 | Nov. 01, 2016
Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 10,147,000 | $ 10,065,000 |  | $ 5,981,000 |  | $ 6,388,000 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Total liabilities measured at fair value |  | 0 | 0 |  |  |  |  |
Total assets measured at fair value |  | 28,010,000 | 24,318,000 |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Total liabilities measured at fair value |  | 0 | 0 |  |  |  |  |
Total assets measured at fair value |  | 4,247,000 | 4,736,000 |  |  |  |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Total liabilities measured at fair value |  | 10,147,000 | 10,065,000 |  |  |  |  |
Total assets measured at fair value |  | 0 | 0 |  |  |  |  |
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | 0 | 0 |  |  |  |  |
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | 0 | 0 |  |  |  |  |
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 10,147,000 | 10,065,000 |  |  |  |  |
Bluenica Corporation |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Earn-out payment installment period | 4 years |  |  |  |  |  |  |
Bluenica Corporation | Minimum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  | 98.60% |  |  |  |  |  |
Bluenica Corporation | Maximum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  | 100.00% |  |  |  |  |  |
TempAlert | Maximum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  | 0.00% |  |  |  |  |  |
Accelerated | Minimum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  | 44.40% |  |  |  |  |  |
Accelerated | Maximum | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Fair value inputs probability of payment |  | 100.00% |  |  |  |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Total liabilities measured at fair value |  | $ 10,147,000 | 10,065,000 |  |  |  |  |
Total assets measured at fair value |  | 32,257,000 | 29,054,000 |  |  |  |  |
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | 10,147,000 | $ 10,065,000 |  |  |  |  |
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 10,400,000 | 5,500,000 |  |  |  |  |  |
Estimate of Fair Value Measurement | FreshTemp | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  | $ 1,300,000
Payment for contingent consideration |  | 200,000 |  |  |  |  |  |
Estimate of Fair Value Measurement | TempAlert | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | 0 |  |  |  | $ 0 |  |
Estimate of Fair Value Measurement | Accelerated | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 4,700,000 |  | $ 2,300,000 |  |  |  |

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