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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-vested shares (in shares) |  | 1,994,972 | 1,603,766 | 1,603,766 | 837,123
Forfeited (in shares) |  | 9,997 | 0 |  |
Unrecognized compensation cost |  | $ 8.4 | $ 8.9 |  |
Unrecognized compensation cost, period for recognition |  | 2 years 1 month 6 days |  |  |
Fair value of vested shares |  | $ 2.1 | $ 1.8 |  |
Shares vested (in shares) |  | 538,243 | 287,611 |  |
PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-vested shares (in shares) |  | 3,623,132 | 2,902,014 | 2,902,014 | 2,018,518
Fair value of vested shares |  | $ 3.7 |  |  |
Fair value, expected term |  | 3 years |  |  |
Fair value, expected term for volatility rate |  | 3 years |  |  |
Shares vested (in shares) |  | 974,074 |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-vested shares (in shares) |  | 1,076,447 | 441,746 | 441,746 | 0
Fair value of vested shares |  | $ 0.5 |  |  |
Requisite service period |  | 3 years |  |  |
Shares vested (in shares) |  | 147,254 | 0 |  |
2017 Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Increase the shares reserved (in shares) | 7,600,000 |  |  |  |
Maximum number of shares that may be issued (in shares) |  | 13,170,000 |  |  |
Shares available for grant (in shares) |  | 1,060,701 |  | 5,540,536 |
2017 Incentive Plan | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued (in shares) |  | 507,821 |  | 507,821 |
2017 Incentive Plan | Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued (in shares) |  | 2,810,829 |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-vested shares (in shares) |  | 1,994,972 |  | 1,603,766 |
Shares available for grant (in shares) |  |  |  | 4,798,517 |
Shares issued (in shares) |  |  |  | 1,881,380 |
Share-based compensation expense |  | $ 1.1 | $ 0.9 |  |
2017 Incentive Plan | PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant (in shares) |  | 6,592,874 |  |  |
Share-based compensation expense |  | $ 1.4 | 1.2 |  |
Unrecognized compensation cost |  | $ 12.9 |  | $ 9.5 |
Unrecognized compensation cost, period for recognition |  | 2 years 3 months 18 days |  |  |
Award vesting period |  | 3 years |  |  |
2017 Incentive Plan | PSUs | Relative TSR Performance is Less Than the 30th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights, percentage |  | 0.00% |  |  |
2017 Incentive Plan | PSUs | Relative TSR Performance is Equal to the 50th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights, percentage |  | 100.00% |  |  |
2017 Incentive Plan | RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant (in shares) |  | 1,076,447 |  | 441,746 |
Share-based compensation expense |  | $ 0.4 | 0.2 |  |
Unrecognized compensation cost |  | $ 4.3 | $ 2.5 |  |
Unrecognized compensation cost, period for recognition |  | 2 years 4 months 24 days |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-vested shares (in shares) |  | 0 |  |  |

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