Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Equity Incentive Plans Narrative (Details)

v3.22.4
Stockholders' Equity - Equity Incentive Plans Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Apr. 04, 2022
Jan. 01, 2022
Jul. 03, 2019
Aug. 27, 2018
Aug. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 06, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards granted (in shares)               989,000 3,800,000    
Stock options outstanding (in shares)               24,926,000 24,597,000    
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value               $ 1,500 $ 0 $ 0  
Exercise of options tax benefit               300      
Unrecognized share-based compensation expense, options               17,100      
Stockholder note receivable       $ (20,000)         0    
Stockholder note receivable, security interest       $ 5,000              
Forgiveness of shareholder note receivable     $ 5,000                
Forgiveness of stockholder note receivable, income tax benefit     $ 1,300                
Percent of salary foregone by CEO             100.00%        
Benefit from income taxes               $ (825) (140,344) (127,538)  
Additional Paid-in Capital                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stockholder note receivable         $ (15,000)       (15,000)    
Stockholder Note Receivable                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stockholder note receivable         $ 15,000       $ 15,000    
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      
Share-based compensation arrangement by share-based payment award, maximum employee subscription rate               15.00%      
Purchase price of commons stock, percent               90.00%      
Share-based compensation expense               $ 100      
Unrecognized share-based compensation expense, period of recognition               4 months 24 days      
Unrecognized share-based compensation expense               $ 400      
Stock options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Contractual term               10 years 10 years    
Lock-up period                 180 days    
Share-based compensation expense               $ 19,800 $ 320,500 $ 0  
Unrecognized share-based compensation expense, period of recognition               2 years 6 months      
Vesting period               4 years 4 years    
Stock options | Center operations                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               $ 1,400 $ 12,700    
Stock options | General, administrative and marketing                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               17,800 303,300    
Stock options | Other operating                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               500 $ 4,500    
Time vesting stock options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards granted (in shares)                 3,300,000    
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               $ 12,400 $ 6,600    
Unrecognized share-based compensation expense, period of recognition               3 years      
Awards granted (in shares)               1,696,000 1,900,000 0  
Unrecognized share-based compensation expense               $ 27,800      
Restricted stock units | Center operations                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               1,400 $ 200    
Restricted stock units | General, administrative and marketing                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               10,600 6,300    
Restricted stock units | Other operating                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense               $ 400 $ 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]                      
Accrued compensation liability             $ 2,200     $ 2,200  
Awards granted (in shares)                 500,000    
Vesting percentage               50.00%      
Percentage vested after 180 Days from effective date of IPO               100.00%      
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%          
Percentage vested after 180 Days from effective date of IPO 100.00%         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
Stock available for issuance, additional, (in shares)   7,700,000                  
Term of plan               10 years      
Shares available for future grants (in shares)               19,300,000      
Awards granted (in shares)                 600,000    
2021 Equity Plan | Restricted stock units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards granted (in shares)                 1,300,000    
Vesting period                 4 years    
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