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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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