Acquisitions - 2017 Acquisition Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jan. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Funds and accounts receivable			$ 1,068
Creator advances			532
Prepaid expenses and other current assets			181
Property and equipment			42
Other noncurrent assets			28
Accounts payable, creators			(19,671)
Other current liabilities			(650)
Intangible assets			3,601
Goodwill	$ 170,560	$ 170,560	11,156	$ 158,766			$ 9,725
Total purchase price			$ 14,299
Total
Business Acquisition [Line Items]
Cash and restricted cash				26,831
Funds and accounts receivable				8,471
Creator advances				8,567
Prepaid expenses and other current assets				1,455
Property and equipment				3,044
Other noncurrent assets				253
Accounts payable, creators				(37,859)
Other current liabilities				(2,974)
Accrued taxes				(7,978)
Deferred tax liabilities				(2,401)
Intangible assets				88,100
Goodwill				149,041
Total purchase price				$ 234,550
Ticketfly, LLC
Business Acquisition [Line Items]
Cash and restricted cash					$ 23,339
Funds and accounts receivable					4,263
Creator advances					8,567
Prepaid expenses and other current assets					1,213
Property and equipment					2,619
Other noncurrent assets					15
Accounts payable, creators					(29,909)
Other current liabilities					(2,138)
Accrued taxes					(6,179)
Deferred tax liabilities					0
Intangible assets					76,300
Goodwill					123,011
Total purchase price					$ 201,101
TSTM Group Limited
Business Acquisition [Line Items]
Cash and restricted cash						$ 3,492
Funds and accounts receivable						4,208
Creator advances						0
Prepaid expenses and other current assets						242
Property and equipment						425
Other noncurrent assets						238
Accounts payable, creators						(7,950)
Other current liabilities						(836)
Accrued taxes						(1,799)
Deferred tax liabilities						(2,401)
Intangible assets						11,800
Goodwill						26,030
Total purchase price						$ 33,449