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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Oct. 28, 2022
USD ($)
May 27, 2022
shares
Jun. 08, 2021
vote
$ / shares
shares
Oct. 31, 2021
USD ($)
$ / shares
Year
shares
Jun. 30, 2021
$ / shares
shares
Dec. 31, 2022
USD ($)
equity_incentive_plan
$ / shares
shares
Dec. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
equity_incentive_plan
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Mar. 31, 2018
shares
May 12, 2022
USD ($)
Mar. 31, 2022
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Preferred stock, authorized (in shares)         100,000,000 100,000,000     100,000,000       100,000,000  
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001 $ 0.001     $ 0.001       $ 0.001  
Preferred stock, issued (in shares)           0     0       0  
Preferred stock, outstanding (in shares)           0     0       0  
Common stock, authorized (in shares)           1,500,000,000     1,500,000,000       1,500,000,000  
Common stock, par value (in dollars per share) | $ / shares           $ 0.001     $ 0.001       $ 0.001  
Conversion of stock, conversion ratio         1                  
Common stock, outstanding (in shares)           193,252,000     193,252,000       192,398,000  
Stock repurchase program, authorized amount | $ $ 70,000                     $ 70,000    
Stock repurchase program, period in force 12 months                          
Repurchase and retirement of common stock (in shares)               2,150,982            
Repurchase and retirement of common stock | $               $ 70,000 $ 70,042 $ 2,698        
Number of shares called by warrants           641,000     641,000          
Stock based compensation expense | $           $ 13,984 $ 9,834   $ 34,843 21,633        
Number of equity incentive plans | equity_incentive_plan           3     3          
Options outstanding in period (in shares)           23,878,000     23,878,000       26,983,000  
Aggregate intrinsic value of options | $                 $ 85,300 $ 406,900        
Unamortized compensation expense, option | $           $ 41,200     $ 41,200          
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares                   $ 10.73        
Share-based Payment Arrangement, Option                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unamortized compensation expense, weighted average period of recognition                 2 years 11 months 19 days          
Award vesting period                 4 years          
Expiration period from the date of grant                 10 years          
Restricted Stock Units (RSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unamortized compensation expense excluding option | $           $ 57,000     $ 57,000          
Unamortized compensation expense, weighted average period of recognition                 3 years 3 months          
Award vesting period                 4 years          
Total fair value of non-option instrument | $                 $ 7,000 $ 1,400        
Outstanding unvested (in shares)           1,829,000     1,829,000       534,000  
Performance-Based Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unamortized compensation expense excluding option | $           $ 1,700     $ 1,700          
Outstanding unvested (in shares)           193,455     193,455          
Outstanding unvested, probable to vest (in shares)           73,377     73,377          
2021 Plan                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of additional shares authorized   9,619,921                        
ESPP                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of additional shares authorized   1,923,984                        
Approved by Board of Directors, Outside of Plans                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Options granted in period (in shares)                     4,682,582      
Options exercised (in shares)           2,027,917     2,027,917          
Options outstanding in period (in shares)           2,654,665     2,654,665          
Contract With U.S. News & World Report, L.P.                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares called by warrants                           250,000
Exercise price called by warrants (in dollars per share) | $ / shares                           $ 0.72
Warrant outstanding, term                           10 years
Warrants exercised in period (in shares)                 125,000          
Warrants exercised in period , intrinsic value | $                 $ 4,000          
Warrant outstanding (in shares)           125,000     125,000          
U.S. News Warrant                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares called by warrants       516,000                    
Exercise price called by warrants (in dollars per share) | $ / shares       $ 12.56                    
Warrant outstanding, term       10 years                    
Warrants outstanding, vesting period       6 years 5 months 23 days                    
Fair value of warrant | $       $ 34,700                    
Stock based compensation expense | $                 $ 4,000          
Unamortized compensation expense excluding option | $           $ 28,100     $ 28,100          
Unamortized compensation expense, weighted average period of recognition                 5 years 3 months          
U.S. News Warrant | Share-Based Payment Arrangement, Subsequent to Tranche One                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants outstanding, vesting period       6 years                    
U.S. News Warrant | Measurement Input, Share Price                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input | $ / shares       76.50                    
U.S. News Warrant | Measurement Input, Price Volatility                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input       0.469                    
U.S. News Warrant | Measurement Input, Risk Free Interest Rate                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input       0.0161                    
U.S. News Warrant | Measurement Input, Expected Term                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input | Year       10                    
U.S. News Warrant | Measurement Input, Expected Dividend Rate                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input       0                    
Class A and Class B Common Stock                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Conversion of stock (in shares)     85,523,836                      
Common Class A                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common stock, authorized (in shares)     1,000,000,000                      
Common stock, par value (in dollars per share) | $ / shares     $ 0.001                      
Common stock, number of votes per share | vote     1                      
Common stock, outstanding (in shares)           118,355,360     118,355,360          
Common Class B                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common stock, authorized (in shares)     500,000,000                      
Common stock, par value (in dollars per share) | $ / shares     $ 0.001                      
Common stock, number of votes per share | vote     10                      
Conversion of stock, conversion ratio     1                      
Common stock, outstanding (in shares)           74,896,344     74,896,344