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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum shares issuable (in shares) | 43,170,000 |  |  |
Common shares reserved for issuance (in shares) | 31,367,872 | 5,540,536 |  |
2017 Plan | Non-employee director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock issued (in shares) |  | 507,821 |  |
2017 Plan | Non-employee director | Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock issued (in shares) | 687,503 |  |  |
2017 Plan | Employee | Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock issued (in shares) | 2,689,394 |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares outstanding, unvested restricted stock (in shares) | 1,909,107 | 1,603,766 | 837,123 | 507,536
Non-cash compensation expense | $ 4.3 | $ 3.8 | $ 2.2 |
Unrecognized compensation expense | $ 5.1 | 5.9 |  |
Weighted average period to recognize the unrecognized compensation expense | 1 year 8 months 12 days |  |  |
Fair value of shares vested | $ 2.5 | $ 1.8 | $ 1.3 |
Requisite service period | 3 years |  |  |
Shares vested (in shares) | 621,438 | 287,611 | 205,080 |
Restricted Stock | 2010 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares outstanding, unvested restricted stock (in shares) | 0 |  |  |
Restricted Stock | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares outstanding, unvested restricted stock (in shares) | 1,909,107 | 1,603,766 |  |
Restricted Stock | 2017 Plan | Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock issued (in shares) |  | 1,881,380 |  |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of shares vested | $ 3.7 |  |  |
Expected term for expected volatility rate | 3 years |  |  |
Shares vested (in shares) | 974,074 |  |  |
Vested shares target (in shares) | 842,792 |  |  |
Performance Shares | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for issuance (in shares) | 6,168,886 | 4,798,517 |  |
Non-cash compensation expense | $ 5.5 | $ 5.0 | $ 2.9 |
Unrecognized compensation expense | $ 7.6 | $ 5.7 | $ 4.5 |
Weighted average period to recognize the unrecognized compensation expense | 1 year 9 months 18 days |  |  |
Award vesting period | 3 years | 3 years |  |
Number of consecutive trading days for Total Shareholder Return (TSR) calculation | 30 days |  |  |
Fair value assumptions, expected term | 3 years |  |  |
Performance Shares | 2017 Plan | 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% |  |  |
Performance Shares | 2017 Plan | 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% |  |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares outstanding, unvested restricted stock (in shares) | 1,016,252 | 441,746 | 0 |
Unrecognized compensation expense | $ 2.7 | $ 1.8 |  |
Weighted average period to recognize the unrecognized compensation expense | 1 year 8 months 12 days |  |  |
Fair value of shares vested | $ 0.5 |  |  |
Requisite service period | 3 years | 3 years |  |
Shares vested (in shares) | 147,254 | 0 |  |
RSUs | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for issuance (in shares) | 1,016,252 | 441,746 |  |
Non-cash compensation expense | $ 1.7 | $ 0.9 |  |

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