Property and Equipment - Additional Information (Details) - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation		$ 38,400,000	$ 22,400,000	$ 23,800,000
Amortization expense for equipment acquired under finance leases		13,124,000
Gross balance of leased equipment	$ 59,696,000	59,696,000
Property and equipment, gross			205,619,000
Accumulated amortization			85,440,000
Asset impairment charges		0	0	3,162,000
Developed technology
Property, Plant and Equipment [Line Items]
Amortization expense		18,737,000	9,519,000	8,200,000
Loss on write-off of retired website development and internal-use software		1,600,000	100,000	300,000
Property and equipment, gross	106,215,000	106,215,000	69,201,000	48,333,000
Accumulated amortization	56,815,000	56,815,000	38,418,000	29,991,000
Asset impairment charges		0	0	3,200,000
Computer equipment
Property, Plant and Equipment [Line Items]
Amortization expense for equipment acquired under finance leases		4,300,000
Amortization expense for equipment acquired under capital leases			5,900,000	$ 7,700,000
Gross balance of leased equipment	30,400,000	30,400,000
Gross balance of leased equipment			29,700,000
Accumulated amortization of equipment under finance leases	28,500,000	$ 28,500,000
Accumulated amortization of equipment under capital leases			24,400,000
Property and equipment, gross			$ 36,670,000
Estimated useful lives		3 years
Reverb Holdings Inc. | Developed technology
Property, Plant and Equipment [Line Items]
Amortization expense		$ 3,800,000
Property and equipment, gross	30,300,000	30,300,000
Accumulated amortization	$ 3,800,000	$ 3,800,000
Estimated useful lives	3 years