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Unrecognized tax benefits (including interest and penalties).

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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Apr. 01, 2023	Jan. 01, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Income Taxes [Line Items]
Income tax expense				$ 13,584	$ 18,654	$ 393
Tax benefit (expense) computed at the federal statutory rate				21.00%	21.00%	21.00%
Change in enacted tax rate, amount				$ 188,900	$ 39,700
Deferred tax liability				$ 10,912	7
Pre-Tax Act U.S. federal net operating loss carry-forwards beginning of expiration year				2031
Pre-Tax Act U.S. state net operating loss carry-forwards beginning of expiration year				2025
U.S. Federal research tax credits beginning of expiration year				2032
Deferred tax assets, valuation allowance				$ 3,611,242	2,293,361
Gross unrecognized tax benefits, including related interest and penalties				469,697	345,328
Net unrecognized tax benefits				469,573	344,971	$ 286,605
Amount of tax benefit when gross unrecognized tax benefits realized				15,900
Other Liabilities
Income Taxes [Line Items]
Net unrecognized tax benefits				$ 15,900	$ 11,800
Accounting Standards Update 2020-06 \| Revision of Prior Period, Accounting Standards Update, Adjustment \| Convertible Notes
Income Taxes [Line Items]
Derecognition of deferred tax liability		$ 138,800
Deferred tax liability		(138,800)
Offsetting increase to valuation allowance recorded to additional paid-in capital and accumulated deficit		$ 138,800
U.K.
Income Taxes [Line Items]
Tax benefit (expense) computed at the federal statutory rate			17.00%	19.00%
Net operating loss carry-forwards				$ 3,200,000
Percentage of taxable income limitation				50.00%
Income tax year under examination				2020
U.K. \| Scenario Forecast
Income Taxes [Line Items]
Tax benefit (expense) computed at the federal statutory rate	25.00%
Federal
Income Taxes [Line Items]
Net operating loss carry-forwards				$ 7,500,000
Pre-Tax Act operating loss carry-forwards							$ 1,600,000
Post-Tax Act operating loss carry-forwards				$ 5,900,000
Pre-Tax Act operating loss carry-forwards period							20 years
Percentage of taxable income limitation				80.00%
Federal \| Research
Income Taxes [Line Items]
Accumulated research tax credits				$ 476,600
State
Income Taxes [Line Items]
Net operating loss carry-forwards				4,400,000
State \| Research
Income Taxes [Line Items]
Accumulated research tax credits				$ 292,800