Variable Interest Entities - Summary of VIE assets and Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 1,377,152	$ 1,550,004	$ 235,893	$ 380,801
Prepaid expenses and other current assets		38,717	33,537
Equity method investments	[1]	6,914	13,194
Property and equipment, net		176,221	145,770
Other non-current assets		53,015	43,990
Total Assets		1,994,219	2,070,990
Accounts payable		19,459	8,189
Accrued expenses and other current liabilities		70,059	93,332
Total Liabilities		427,163	503,611
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		26,950	58,025
Prepaid expenses and other current assets		6,642	737
Equity method investments		1,283	11,694
Property and equipment, net		130	0
Other non-current assets		3	0
Total Assets		35,008	70,456
Accounts payable		62	188
Accrued expenses and other current liabilities		85	440
Total Liabilities		$ 147	$ 628

[1] Equity method investments in Platform Ventures with a carrying value of zero as of June 30, 2022 and December 31, 2021 were excluded from the table.