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Stock-Based Compensation - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) shares | Oct. 31, 2019 USD ($) shares | Dec. 31, 2021 USD ($) period $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant date fair value, options granted (in dollars per share) | $ / shares |  |  | $ 5.22 | $ 1.10 | $ 1.23 |
Aggregate grant-date fair value, options |  |  | $ 7,300,000 | $ 5,400,000 | $ 3,700,000 |
Intrinsic value of options exercised |  |  | 72,208,000 | 2,400,000 | 3,000,000 |
Share-based compensation expense, accelerated cost |  |  |  |  | 4,000,000 |
Tax benefit, stock-based compensation expense |  |  | 0 | 0 | 0 |
Tax benefit, exercise of stock-based awards |  |  | $ 0 | $ 0 | $ 0 |
Repurchase and retirement of common stock in connection with tender offer (in shares) | shares |  | 2,053,690 |  |  |  |
Repurchase and retirement of common stock, aggregate purchase price |  | $ 11,000,000 |  |  |  |
Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase and retirement of common stock in connection with tender offer (in shares) | shares |  |  |  |  | 2,053,690 |
Repurchase and retirement of common stock, aggregate purchase price, equity impact |  | (7,000,000) |  |  |  |
Accumulated Deficit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase and retirement of common stock, aggregate purchase price, equity impact |  | 7,000,000 |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase and retirement of common stock, aggregate purchase price, equity impact |  | $ 0 |  |  |  |
Marketing |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense, accelerated cost |  |  |  |  | $ 200,000 |
Technology and development |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense, accelerated cost |  |  |  |  | 2,000,000 |
General and administrative |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense, accelerated cost |  |  |  |  | $ 1,800,000 |
Equity Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | shares |  |  |  |  |  | 43,899,677
2021 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | shares | 25,000,000 |  |  |  |  |
Number of additional shares authorized | shares | 552,736 |  |  |  |  |
Common stock, reserved (in shares) | shares | 25,552,736 |  | 23,599,005 | 206,529 |  |
Common stock reserved for issuance, annual increase percentage | 5.00% |  |  |  |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of purchase periods | period |  |  | 4 |  |  |
Purchase period |  |  | 6 months |  |  |
Consecutive offering period |  |  | 24 months |  |  |
Maximum employee contribution rate |  |  | 15.00% |  |  |
ESPP purchase price of common stock, percent of market price |  |  | 85.00% |  |  |
Granted (in shares) | shares |  |  |  | 0 |  |
Unamortized compensation cost |  |  | $ 3,900,000 |  |  |
Unamortized compensation cost, recognition period |  |  | 1 year 8 months 12 days |  |  |
ESPP | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Consecutive offering period |  |  | 27 months |  |  |
ESPP | 2021 ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | shares | 3,500,000 |  |  |  |  |
Common stock, reserved (in shares) | shares |  |  | 3,500,000 |  |  |
Common stock reserved for issuance, annual increase percentage | 1.00% |  |  |  |  |
Maximum number of shares available over award term | shares | 35,000,000 |  |  |  |  |
Number of shares issued | shares |  |  | 0 |  |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cliff vesting period |  |  | 1 year |  |  |
Exercisable period |  |  | 10 years |  |  |
Exercisable period, termination of service |  |  | 3 months |  |  |
Stock options | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Stock options | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Performance sares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Cliff vesting period |  |  | 1 year |  |  |
Share-based compensation expense, accelerated cost | $ 1,100,000 |  |  |  |  |
Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 27.16 | $ 3.54 |  |
Weighted-average aggregate grant date fair value, vested |  |  | $ 600,000 | $ 0 |  |
Vested (in shares) | shares |  |  | 124,026 |  | 0 |
Granted (in shares) | shares |  |  | 3,112,492 |  | 0 |
Unamortized compensation cost |  |  | $ 122,600,000 |  |  |
Unamortized compensation cost, recognition period |  |  | 3 years 3 months 18 days |  |  |

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