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Business Combinations - Developed Technology (Details) - USD ($)
$ in Thousands
2 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Property and equipment, accumulated depreciation and amortization $ 108,972 $ 85,440
Net book value 153,262 $ 120,179
Developed technology | Reverb Holdings Inc.    
Business Acquisition [Line Items]    
Gross book value 30,300  
Property and equipment, accumulated depreciation and amortization 1,263  
Net book value $ 29,037  
Estimated Useful Life 3 years