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Acquisitions - Quickthree Solutions, Inc. (Details) - USD ($)
3 Months Ended
Jun. 01, 2018
Mar. 15, 2018
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Acquisition costs     $ 0 $ 0
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