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Stock-Based Compensation - Restricted Stock Units (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
RSUs and PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 194,000 |  |
Share-based compensation options vested in period (in shares) |  |  | 158,000 |  |
Stock-based compensation expense | $ 3,700 | $ 3,200 | $ 6,800 | $ 4,400 |
Remaining stock-based compensation expense for unvested shares, not yet recognized | $ 39,400 |  | $ 39,400 |  |
Stock-based compensation expense, weighted average recognition period |  |  | 2 years 7 months 6 days |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 159,000 |  |
Vesting period |  |  | 4 years |  |
PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 35,000 |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
Share-based compensation options vested in period (in shares) |  |  | 50,000 |  |
Percent of achievement of award target performance metric |  |  |  |  | 106.00%
PSUs | Executive |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 7,688 |  |
Stock-based compensation expense |  |  | $ 500 |  |
PSUs | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance based cash bonus payment percent |  |  |  |  | 12.00%
PSUs | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 0.00% |  | 0.00% |  |
PSUs | Minimum | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
Performance based cash bonus payment percent |  |  | 0.00% |  |
PSUs | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
PSUs | Maximum | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 150.00% |  | 150.00% |  |
Performance based cash bonus payment percent |  |  | 65.00% |  |
PSUs Granted in 2021 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 34,000 |  |
PSUs Granted in 2020 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 12,000 |  |
PSUs Granted in 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 31,000 |  |
PSUs Granted in 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  |  | 35,000 |  |
Performance Stock Units Granted in 2019 and 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
Performance Stock Units Granted in 2019 and 2018 | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation options vested in period (in shares) |  |  | 45,000 |  |
Performance Stock Units Granted in 2019 and 2018 | Vesting Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation options vested in period (in shares) |  |  | 39,000 |  |
Performance Stock Units Granted in 2019 and 2018 | Vesting Tranche Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation options vested in period (in shares) |  |  | 28,000 |  |
Performance Stock Units Granted in 2019 and 2018 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 0.00% |  | 0.00% |  |
Percent of cash bonus payments on initial targets, percent |  |  | 0.00% |  |
Performance Stock Units Granted in 2019 and 2018 | Minimum | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
Performance Stock Units Granted in 2019 and 2018 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 100.00% |  | 100.00% |  |
Percent of cash bonus payments on initial targets, percent |  |  | 65.00% |  |
Performance Stock Units Granted in 2019 and 2018 | Maximum | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of targeted performance metric | 150.00% |  | 150.00% |  |

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