Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

v3.23.1
Stockholders' Equity (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Jan. 01, 2022
Mar. 31, 2023
Mar. 31, 2022
Oct. 06, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)   0.7    
Stock option exercises (in shares)   0.3    
Stock options outstanding (in shares)   25.2    
Stock options exercisable (in shares)   21.6    
Unrecognized share-based compensation expense, options   $ 20,400    
Share-based compensation   $ 5,422 $ 21,438  
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance (in shares)   2.9    
Annual increase in shares authorized, percent   1.00%    
Maximum shares available for issuance (in shares)   29.0    
Maximum employee common stock purchase, percent   15.00%    
Purchase price of commons stock, percent   90.00%    
Share-based compensation expense   $ 200    
Unrecognized share-based compensation expense, period of recognition   2 months 12 days    
Unrecognized share-based compensation expense   $ 100    
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contractual term   10 years    
Vesting period   4 years    
Share-based compensation expense   $ 2,200 11,400  
Unrecognized share-based compensation expense, period of recognition   2 years 9 months 18 days    
Stock options | Center operations        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 200 1,000  
Stock options | General, administrative and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   2,000 10,100  
Stock options | Other operating income/expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense     300  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 3,000 5,200  
Unrecognized share-based compensation expense, period of recognition   2 years 4 months 24 days    
Awards granted (in shares)   0.7    
Awards outstanding (in shares)   2.5    
Unrecognized share-based compensation expense   $ 36,300    
Restricted stock units | Share-based Payment Arrangement, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Vesting percentage   50.00%    
Restricted stock units | Center operations        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 500 200  
Restricted stock units | General, administrative and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   2,300 5,000  
Restricted stock units | Other operating income/expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 200    
Time vesting restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)   0.4    
Performance vesting restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)   0.3    
Restricted Series A Preferred Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense     $ 4,800  
Liability Classified Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 200    
2021 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance (in shares)       14.5
Annual increase in shares authorized, percent   4.00%    
Additional shares available for issuance (in shares) 7.7      
Term of plan   10 years    
Shares available for future grants (in shares)   18.4    
2015 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance (in shares)       1.0