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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 |  |  |  |  |  |  |

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