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Business Acquisitions - Proforma Results of Operations (Details) - USD ($) $ in Thousands		12 Months Ended
	May 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Amortization of intangible assets		$ 9,374	$ 8,809
Dealflo Limited
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Amortization of intangible assets		1,300	3,200
Revenue		4,000
Acquisition related costs	$ 1,100
Dealflo Limited \| Non-recurring acquisition-related costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition related costs		1,100	1,100
Dealflo Limited \| Fair value adjustment of acquired deferred revenue
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue			600
Dealflo Limited \| Intercompany elimination
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue		$ 200	$ 500