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Acquisitions - Quickthree Solutions, Inc. (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jun. 01, 2018	Mar. 15, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Acquisition costs			$ 0	$ 843,000	$ 0	$ 1,159,000
Payments to acquire assets		$ 15,549,000
Quickthree Solutions
Business Acquisition [Line Items]
Purchase agreement amount	$ 30,000,000
Consideration transferred, adjustment	$ 12,750,000
Adjustment period	3 years

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