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Consolidated Balance Sheets (Parenthetical)
shares in Thousands
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2021
£ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
£ / shares
shares
Deferred stock, par value (in dollars per share) | $ / shares $ 0.000001   $ 0.000001  
Deferred stock, issued (in shares) 361,170 361,170 316,407 316,407
Deferred stock, outstanding (in shares) 361,170 361,170 316,407 316,407
Common Class A        
Common stock, par value (in dollars/pounds per share) | $ / shares $ 0.0001   $ 0.0001  
Common stock, issued (in shares) 432,963 432,963 388,135 388,135
Common stock, outstanding (in shares) 432,963 432,963 388,135 388,135
Common Class B        
Common stock, par value (in dollars/pounds per share) | $ / shares $ 0.000001   $ 0.000001  
Common stock, issued (in shares) 174,213 174,213 218,976 218,976
Common stock, outstanding (in shares) 174,213 174,213 218,976 218,976
Class R Redeemable Stock        
Common stock, par value (in dollars/pounds per share) | £ / shares   £ 1   £ 1
Common stock, issued (in shares) 50 50 50 50
Common stock, outstanding (in shares) 50 50 50 50