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Share-Based Compensation - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Aug. 01, 2019 | Apr. 30, 2019 | Oct. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2021 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) |  |  |  |  | 4,218,278 | 4,218,278 | 5,170,976 | 5,120,293 |  | 4,207,029
Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued, unvested (in shares) |  |  |  |  | 275,989 | 275,989 | 149,004 | 0 |  |
Share-based compensation expense |  |  |  |  |  | $ 9,800,000 | $ 3,700,000 | $ 0 |  |
Unrecognized compensation expense, period of recognition |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |
Unrecognized share-based compensation expense |  |  |  |  | $ 14,900,000 | $ 14,900,000 |  |  |  |
Vested (in shares) |  |  |  |  |  | 99,970 | 23,552 |  |  |
Granted (in shares) |  |  |  |  |  | 244,752 | 173,196 |  |  |
Restricted stock price (in dollars per share) |  |  |  |  |  | $ 109.61 | $ 126.29 |  |  |
Fair value per share (in dollars per share) |  |  |  |  | $ 114.99 | $ 114.99 | $ 132.73 | $ 0 |  |
Restricted stock units | Employee |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years | 4 years |  |  |
Restricted stock units | Nonemployee | Director |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 12 months |  |  |  |
Restricted stock units | First Anniversary |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% | 25.00% |  |  |
Restricted stock units | Thereafter |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  |  |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 10 years |  |
Share-based compensation expense |  |  |  |  |  | $ 13,100,000 | $ 6,300,000 | $ 1,500,000 |  |
Unrecognized compensation expense |  |  |  |  | $ 16,400,000 | $ 16,400,000 |  |  |  |
Unrecognized compensation expense, period of recognition |  |  |  |  |  | 2 years |  |  |  |
Employee Stock Options | Employee |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 48 months |  |  |  |
Employee Stock Options | Employee | Executive Chair |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 24 months | 48 months |  |  |  |  |  |  |  |
Employee Stock Options | First Anniversary |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% | 25.00% |  |  |
Employee Stock Options | Thereafter |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years | 3 years |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense, period of recognition |  |  |  |  |  |  | 8 months 12 days |  |  |
Unrecognized share-based compensation expense |  |  |  |  |  |  | $ 2,500,000 |  |  |
Share-based compensation expense accrued, not issued |  |  |  |  |  | $ 3,000,000.0 | 1,000,000.0 |  |  |
Share-based compensation expense accrued, amount reclassified to APIC |  |  |  |  |  | 3,000,000.0 |  |  |  |
Share-based compensation liability |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 | $ 1,000,000.0 |  |  |
Vested (in shares) |  |  |  |  | 23,666 |  |  |  |  |
Fair value of shares vested |  |  |  |  | $ 3,000,000.0 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued, unvested (in shares) |  |  |  |  | 12,184 | 12,184 | 88,988 | 100,127 |  | 0
Vesting period |  |  | 24 months |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 1,400,000 | $ 1,800,000 | $ 700,000 |  |
Unrecognized share-based compensation expense |  |  |  |  | $ 200,000 | $ 200,000 |  |  |  |
Vested (in shares) |  |  |  |  |  | 76,804 | 87,239 | 35,664 |  |
Granted (in shares) |  |  |  | 135,791 |  | 0 | 99,433 | 135,791 |  |
Restricted stock price (in dollars per share) |  |  |  |  |  | $ 0 | $ 20.02 | $ 17.03 |  |
Purchase price (in dollars per share) |  |  | $ 0.01 | $ 0.02 |  |  |  |  |  |
Fair value per share (in dollars per share) |  |  |  | $ 17.03 | $ 20.02 | $ 20.02 | $ 19.49 | $ 17.03 |  | $ 0
Shares of restricted stock purchased by nonemployees (in shares) |  |  |  |  | 12,184 | 12,184 |  |  |  |
Weighted average remaining contractual life |  |  |  |  |  | 3 months 18 days | 1 year 2 months 12 days | 1 year 7 months 6 days |  |
Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 12 months |  |  |  |  |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 24 months |  |  |  |  |  |
2018 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  | 16,626,877 | 16,626,877 |  |  |  |
Additional shares authorized annually (in shares) |  |  |  |  |  | 2,144,521 |  |  |  |
Percent of common stock outstanding, per year |  |  |  |  |  | 4.00% |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 7,127,079 | 5,864,738 |  |  |
2018 Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  |  |  | 18,771,398 |
2018 Plan | Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued, unvested (in shares) |  |  |  |  | 275,989 | 275,989 |  |  |  |
2018 ESPP | Employee Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  | 1,340,325 | 1,340,325 |  |  |  |
Additional shares authorized annually (in shares) |  |  |  |  |  | 536,130 |  |  |  |
Percent of common stock outstanding, per year |  |  |  |  |  | 1.00% |  |  |  |
Period of additional shares authorized |  |  |  |  |  | 10 years |  |  |  |
2018 ESPP | Employee Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  |  |  |  |  |  | 1,876,455 |

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