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Summary of Significant Accounting Policies - Performance Obligations (Details) - Machinio - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
$ in Millions
Mar. 31, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 3.0
Remaining performance obligation, period 1 year