Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Equity Incentive Plans Narrative (Details)

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Stockholders' Equity - Equity Incentive Plans Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 10 Months Ended 12 Months Ended 18 Months Ended
Jul. 03, 2019
Jun. 06, 2019
Jun. 05, 2019
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Oct. 06, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           3,754,000     600,000  
Stock options outstanding (in shares)         21,119,000 24,597,000 21,119,000   21,119,000  
Stock options exercisable (in shares)           9,388,000        
Percentage of stock options outstanding that became exercisable 100.00%                  
Repurchase of stock options (in shares)   1,600,000                
Purchases of stock options   $ 23,200       $ 0 $ 0 $ 23,155    
Unrecognized share-based compensation expense, options           $ 31,300        
Percent of salary foregone by CEO         100.00%          
Continuing employees and service providers                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options outstanding (in shares) 21,200,000         21,200,000        
Repurchase of stock options (in shares)   1,500,000                
Purchases of stock options   $ 22,400                
Former employees and service providers                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Repurchase of stock options (in shares)   100,000                
Purchases of stock options   $ 800                
Share-based compensation expense   $ 700 $ 100              
Options granted in 2021                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options outstanding (in shares)           3,700,000        
Stock options exercisable (in shares)           0        
Options granted prior to 2021                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options outstanding (in shares)           20,900,000        
Options granted prior to 2021 | CEO                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options outstanding (in shares)           9,400,000        
Options granted prior to 2021 | Employees and other participants other than CEO                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options outstanding (in shares)           11,500,000        
ESPP                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares reserved for issuance (in shares)           2,900,000        
Annual increase in shares authorized, percent           1.00%        
Maximum shares available for issuance (in shares)           29,000,000        
Purchase price of commons stock, percent           85.00%        
Stock options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Contractual term           10 years        
Lock-up period           180 days        
Share-based compensation expense           $ 320,500 0 24,200    
Unrecognized share-based compensation expense, period of recognition           2 years 7 months 6 days        
Stock options | Center operations                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           $ 12,700        
Stock options | General, administrative and marketing                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           303,300        
Stock options | Other operating                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           $ 4,500        
Time vesting stock options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           3,300,000        
Vesting period           4 years        
Performance vesting stock options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           500,000        
Restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           $ 6,600 $ 0 $ 0    
Unrecognized share-based compensation expense, period of recognition           3 years 2 months 12 days        
Awards granted (in shares)           1,863,000 0      
Unrecognized share-based compensation expense           $ 24,500        
Restricted stock units | Center operations                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           200        
Restricted stock units | General, administrative and marketing                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           6,300        
Restricted stock units | Other operating                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense           $ 100        
2015 Equity Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares reserved for issuance (in shares)           30,600,000        
Shares available for issuance (in shares)           1,000,000        
Awards granted (in shares)           3,200,000        
2015 Equity Plan | Restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           600,000        
2015 Equity Plan | Restricted stock units | CEO                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           500,000        
Vesting percentage           50.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vested After 180 Days From Effective Date of IPO           100.00%        
Accrued compensation liability         $ 2,200   $ 2,200   $ 2,200  
2015 Equity Plan | Restricted stock units | Employees and other participants other than CEO                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)       100,000            
Vesting percentage       50.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vested After 180 Days From Effective Date of IPO       100.00%            
2021 Equity Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares reserved for issuance (in shares)                   14,500,000
Annual increase in shares authorized, percent           4.00%        
Term of plan           10 years        
Shares available for future grants (in shares)           13,800,000        
Awards granted (in shares)           600,000        
2021 Equity Plan | Restricted stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period           4 years        
Awards granted (in shares)           1,300,000        
2021 Equity Plan | Restricted stock units | Share-based Payment Arrangement, Tranche One                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares)           100,000