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Acquisition (Details) | Jan. 22, 2018 USD ($) | Oct. 20, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 153,578,000 | $ 154,535,000 | [1] | $ 149,333,000 | $ 131,995,000
Accelerated |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid at closing | $ 16,400,000 |  |  |  |  |  |  |
Cash acquired | 200,000 |  |  |  |  |  |  |
Goodwill | $ 5,700,000 |  |  |  |  |  |  |
Earn-out payment installments | 2 |  |  |  |  |  |  |
TempAlert |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price before working capital adjustments |  | $ 45,000,000 |  |  |  |  |  |
Cash paid at closing |  | 40,700,000 |  |  |  |  |  |
Cash acquired |  | 600,000 |  |  |  |  |  |
Goodwill |  | 17,600,000 |  |  |  |  |  |
Earn-out payments | Accelerated |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Earn-out payment maximum | $ 4,500,000 |  |  |  |  |  |  |
Earn-out payments | TempAlert |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  |  | 35,000,000 |  |  |  |
Additional earn-out payment | Accelerated |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Earn-out payment maximum | 2,000,000 |  |  |  |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  | 10,147,000 | $ 10,065,000 |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | Accelerated |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 2,300,000 |  |  | 4,700,000 |  |  |  |
Fair Value, Measurements, Recurring | Contingent Consideration | Estimate of Fair Value Measurement | TempAlert |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration fair value |  | $ 0 |  | $ 0 |  |  |  |
Forecast | Earn-out payments | TempAlert |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Earn-out payment maximum |  |  | $ 45,000,000 |  |  |  |  |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

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