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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jul. 31, 2022 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |
Options outstanding (in shares) |  | 12,642,503 |  | 12,642,503 |  |  | 11,260,788
Capitalized stock-based compensation expense |  | $ 0.3 | $ 0.2 | $ 0.5 | $ 0.4 |  |
2018 Stock Option and Incentive Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Annual cumulative increase in the number of shares reserved and available for issuance | 5.00% |  |  |  |  |  |
Options issued (in shares) |  | 6,637,862 |  | 6,637,862 |  |  |
Options outstanding (in shares) |  | 6,637,862 |  | 6,637,862 |  |  |
2010 Stock Option Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Options issued (in shares) |  | 6,004,641 |  | 6,004,641 |  |  |
Options outstanding (in shares) |  | 6,004,641 |  | 6,004,641 |  |  |
Stock Options |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Compensation expense not yet recognized |  | $ 24.0 |  | $ 24.0 |  |  |
Weighted-average recognition period for unrecognized stock-based compensation |  |  |  | 2 years 4 months 24 days |  |  |
Weighted-average fair value of stock options granted (in dollars per share) |  |  |  | $ 7.13 |  |  |
Stock Options | 2004 Plan, 2010 Plan and 2018 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |
Expiration period |  |  |  | 10 years |  |  |
Performance Stock Unit | Minimum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Performance targets, eligible issuance of shares |  |  |  |  |  | 0.00% |
Performance Stock Unit | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Performance targets, eligible issuance of shares |  |  |  |  |  | 200.00% |
RSUs and PSUs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted-average recognition period for unrecognized stock-based compensation |  |  |  | 3 years 1 month 6 days |  |  |
Total unrecognized stock-based compensation |  | $ 98.4 |  | $ 98.4 |  |  |
Class A Common Stock | 2018 Stock Option and Incentive Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  | 5,365,832 |  | 5,365,832 |  |  |

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