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Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 02, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Conversion ratio |  |  |  |  | 1 |
Unvested restricted common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  | 3 years |
Number of shares, granted (in shares) |  |  |  |  | 1,177,537 |
Awards expected to vest in 2021 (in shares) |  |  | 8,202 |  | 8,202 |
Awards expected to vest in 2022 (in shares) |  |  | 268,882 |  | 268,882 |
Awards expected to vest in 2023 (in shares) |  |  | 306,183 |  | 306,183 |
Awards expected to vest in 2024 (in shares) |  |  | 381,527 |  | 381,527 |
Awards expected to vest in 2025 (in shares) |  |  | 162,234 |  | 162,234 |
Awards expected to vest in 2026 (in shares) |  |  | 324,469 |  | 324,469 |
Unrecognized compensation cost |  |  | $ 11.0 |  | $ 11.0 |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) |  |  |  |  | 39 months |
Compensation expense |  |  | $ 1.0 | $ 0.7 | $ 2.8 | $ 2.0
Shares related to unvested PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  | 3 years |
Number of shares, granted (in shares) |  |  |  |  | 347,981 |
Vesting percentage |  |  |  |  | 100.00% |
Awards expected to vest in 2021 (in shares) |  |  | 269,224 |  | 269,224 |
Awards expected to vest in 2022 (in shares) |  |  | 352,035 |  | 352,035 |
Awards expected to vest in 2023 (in shares) |  |  | 347,981 |  | 347,981 |
Unrecognized compensation cost |  |  | $ 4.5 |  | $ 4.5 |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) |  |  |  |  | 23 months |
Compensation expense |  |  | $ 0.8 | 0.7 | $ 2.2 | $ 2.0
Performance period (in years) | 2 years |  |  |  | 3 years |
Percentage of target award of maximum possible payout to executives |  |  |  |  | 150.00% |
Number of units earned if total stockholder return is negative |  |  |  |  | 100.00% |
Fair value at grant date (in dollars per share) | $ 9.28 |  |  |  |  |
Volatility | 68.80% |  |  |  |  |
Risk-free rate | 0.26% |  |  |  |  |
Fair value at grant date based on hotel market share (in dollars per share) | $ 9.40 |  |  |  |  |
Shares related to unvested PSUs | Executive Officers |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares, granted (in shares) | 347,981 |  |  |  |  |
Total shareholder return |  |  |  |  | 50.00% |
Hotel market share |  |  |  |  | 50.00% |
Percentage of total stockholder return for payout of shares |  |  |  |  | 30.00% |
Maximum possible payout to executive officer as percentage of the target award |  |  |  |  | 150.00% |
Shares related to unvested PSUs | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of total stockholder return for payout of shares |  |  |  |  | 30.00% |
Shares related to unvested PSUs | Minimum | Executive Officers |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of total stockholder return for payout of shares |  |  |  |  | 75.00% |
Percentage of total stockholder return for payout of shares |  |  |  |  | 75.00% |
Long-Term Incentive Plan Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards expected to vest in 2021 (in shares) |  |  | 108,422 |  | 108,422 |
Awards expected to vest in 2022 (in shares) |  |  | 26,966 |  | 26,966 |
Unrecognized compensation cost |  |  | $ 0.7 |  | $ 0.7 |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) |  |  |  |  | 14 months |
Compensation expense |  |  | $ 0.3 | $ 0.3 | $ 0.8 |
Units granted (in shares) |  |  | 325,264 |  | 325,264 |
Units vested (in shares) |  |  | 189,876 |  | 189,876 |
2016 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option and incentive plan, shares authorized (up to) (in shares) |  |  | 6,082,664 |  | 6,082,664 |
Number of shares issued or committed to issue (in shares) |  |  | 4,409,225 |  | 4,409,225 |
Special Retention Awards | Unvested restricted common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
Number of shares, granted (in shares) |  | 691,490 |  |  |  |
Special Retention Awards | Unvested restricted common stock | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  | 0.00% |  |  |  |
Special Retention Awards | Unvested restricted common stock | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |
Special Retention Awards | Unvested restricted common stock | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |
Special Retention Awards | Unvested restricted common stock | Tranche Four |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |

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