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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 08, 2021
vote
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Apr. 30, 2010
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Mar. 31, 2018
shares
Oct. 08, 2021
USD ($)
Year
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Jun. 14, 2021
$ / shares
shares
Mar. 31, 2021
$ / 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   0  
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  
Forward split ratio 2                        
Common stock, authorized (in shares)       1,500,000,000   1,500,000,000           198,000,000  
Common stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001           $ 0.001  
Common stock, outstanding (in shares)       190,071,000   190,071,000           82,910,000  
Number of shares called by warrants       766,000   766,000           250,000  
Stock based compensation expense | $       $ 9,834 $ 2,220 $ 21,633 $ 4,382            
Number of shares reserved for future issuance       57,561,000   57,561,000           114,663,000  
Options granted in period (in shares)           1,966,000              
Options outstanding in period (in shares)       29,354,000   29,354,000           36,576,000  
Aggregate intrinsic value of options | $           $ 406,900 $ 19,000            
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares           $ 10.73 $ 2.08            
Unamortized compensation expense, option | $       $ 59,000   $ 59,000              
Granted (in dollars per share) | $ / shares           $ 12.56              
Share-based Payment Arrangement, Option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unamortized compensation expense, weighted average period of recognition           3 years 2 months 4 days              
Performance Shares                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock based compensation expense | $       $ 800   $ 1,000              
Options outstanding in period (in shares)       480,000   480,000              
Unamortized compensation expense, option | $       $ 1,200   $ 1,200              
Performance Shares | Chief Executive Officer                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock based compensation expense | $       300   $ 1,500              
Unamortized compensation expense, weighted average period of recognition           4 months 28 days              
Options granted in period (in shares)   1,792,000                      
Unamortized compensation expense, option | $       500   $ 500              
Granted (in dollars per share) | $ / shares   $ 0.97                      
Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unamortized compensation expense excluding option | $       $ 18,000   $ 18,000              
Unamortized compensation expense, weighted average period of recognition           3 years 6 months 21 days              
Other than options granted in period (in shares)           347,121              
Granted (in dollars per share) | $ / shares           $ 74.53              
Forfeited (in shares)           1,000              
Unvested (in shares)       327,000   327,000           0  
Restricted Stock Units (RSUs) | Share-Based Payment Arrangement, Tranche One And Tranche Two                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of vesting shares           28,250              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche One                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting percentage           50.00%              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Two                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting percentage           50.00%              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Three                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period           4 years              
Performance-Based Restricted Stock Units                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock based compensation expense | $       $ 700   $ 700              
Unamortized compensation expense excluding option | $       $ 400   $ 400              
Unamortized compensation expense, weighted average period of recognition           7 months 13 days              
Other than options granted in period (in shares)           15,239              
Granted (in dollars per share) | $ / shares           $ 80.00              
Forfeited (in shares)           966              
Unvested (in shares)       14,273   14,273              
Employee Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unamortized compensation expense excluding option | $       $ 300   $ 300              
Unamortized compensation expense, weighted average period of recognition           1 month 17 days              
Granted (in dollars per share) | $ / shares           $ 27.27              
Purchase price of common stock under an employee stock purchase plan as a percentage of market price           85.00%              
Employee contributions withheld under an employee stock purchase plan | $       $ 800   $ 800              
2010 Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options outstanding in period (in shares)       26,645,000   26,645,000           33,856,000  
2010 Plan | Share-based Payment Arrangement, Option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period     4 years                    
Expiration period from the date of grant     10 years                    
2010 Plan | Individuals With Voting Interest Less Than Threshold                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Grant exercise price, percentage of estimated fair value of common stock on date of grant (not less than)     100.00%                    
2010 Plan | Individuals With Voting Interest At Threshold                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Grant exercise price, percentage of estimated fair value of common stock on date of grant (not less than)     110.00%                    
Voting interests threshold     10.00%                    
ESPP                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares reserved for future issuance                   4,500,000      
Maximum annual increase of shares reserved for future issuance (in shares)                   6,750,000      
Maximum annual increase of shares reserved for future issuance as a percentage of common stock outstanding                   1.00%      
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)       1,973,332   1,973,332              
Options outstanding in period (in shares)       2,709,250   2,709,250           2,720,000  
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                         5 years
U.S. News Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares called by warrants                 516,000   1,200,000    
Exercise price called by warrants (in dollars per share) | $ / shares                     $ 12.56    
Stock based compensation expense | $       $ 1,200   $ 1,200              
Warrant outstanding, term                 6 years 5 months 23 days   6 years    
Fair value of warrant | $                 $ 34,700        
Unamortized compensation expense excluding option | $       $ 33,500   $ 33,500              
Unamortized compensation expense, weighted average period of recognition           6 years 3 months              
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)       103,829,213   103,829,213              
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                        
Common stock, outstanding (in shares)       86,241,144   86,241,144