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Business Acquisitions - Proforma Results of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Amortization of intangible assets $ 2,348  
Dealflo Limited    
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Amortization of intangible assets   $ 800
Revenue $ 1,900  
Dealflo Limited | Intercompany elimination    
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Revenue   $ 100