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Business Acquisitions - Dealflo Limited (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	May 30, 2018	May 29, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 29, 2019	Jan. 01, 2018
Acquired Finite-Lived Intangible Assets
Acquired identifiable intangible assets, Estimated Fair Value	$ 17,900
Goodwill.			$ 97,552				$ 94,612				$ 97,552	$ 94,612	$ 91,841
Net losses			$ 1,756	$ 1,678	$ 2,023	$ (4)	$ (4,585)	$ (11,847)	$ 2,511	$ 6,056	5,455	(7,864)	(3,044)
Dealflo Limited
Acquired Finite-Lived Intangible Assets
Ownership percentage	100.00%
Cash	$ 5,700
Cash paid to acquire remaining interest	$ 53,100
Remaining ownership percentage acquired	99.00%
Previous ownership percentage		1.00%
Increase in book value of ownership interest															$ 500
Fair value of previous ownership interest	$ 800										$ 800
Increase in deferred tax liability												1,800
Increase in other current assets												600
Increase in goodwill												$ 1,100
Acquired tangible assets	2,700
Acquired identifiable intangible assets, Estimated Fair Value	17,900													$ 17,900
Liabilities assumed	(6,041)
Goodwill.	39,295
Total purchase price consideration	53,854	$ 53,900
Acquisition related expense													$ 1,100
Customer relationships
Acquired Finite-Lived Intangible Assets
Acquired identifiable intangible assets, Estimated Fair Value	$ 11,800
Identifiable Intangible Assets, Estimated Weighted Average Amortization Period	7 years
Technology
Acquired Finite-Lived Intangible Assets
Acquired identifiable intangible assets, Estimated Fair Value	$ 5,900
Identifiable Intangible Assets, Estimated Weighted Average Amortization Period	4 years
Trademarks
Acquired Finite-Lived Intangible Assets
Acquired identifiable intangible assets, Estimated Fair Value	$ 200
Identifiable Intangible Assets, Estimated Weighted Average Amortization Period	3 years