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Stock-Based Compensation - Restricted Stock Units Narrative (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
RSUs and PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 174 |  |
Shares vested (in shares) | 268 |  |
Stock-based compensation expense | $ 10.4 | $ 8.3 | $ 5.5
Remaining stock-based compensation expense for unvested shares, not yet recognized | $ 23.4 |  |
Stock-based compensation expense, weighted average recognition period (in years) | 2 years 2 months 12 days |  |
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 160 |  |
Vesting period | 4 years |  |
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 14 |  |
Percent of award target performance metric | 100.00% |  |
Shares vested (in shares) | 84 |  |
Percent of achievement of award target performance metric |  | 95.00% |
PSUs | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 0.00% |  |
PSUs | Minimum | Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 100.00% |  |
Performance-based cash bonus payment, percent | 100.00% |  |
PSUs | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 100.00% |  |
PSUs | Maximum | Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 150.00% |  |
Performance-based cash bonus payment, percent | 165.00% |  |
PSUs | 2016 Performance metric |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 4 |  |
PSUs granted in 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 32 |  |
PSUs granted in 2018 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 82 |  |
PSUs granted in 2019 and 2018 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 100.00% |  |
PSUs granted in 2019 and 2018 | Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vested (in shares) | 48 |  |
PSUs granted in 2019 and 2018 | Tranche two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vested (in shares) | 42 |  |
PSUs granted in 2019 and 2018 | Tranche three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vested (in shares) | 24 |  |
PSUs granted in 2019 and 2018 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 0.00% |  |
Percent of cash bonus payment on initial targets | 100.00% |  |
PSUs granted in 2019 and 2018 | Minimum | Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 100.00% |  |
PSUs granted in 2019 and 2018 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 100.00% |  |
Percent of cash bonus payment on initial targets | 165.00% |  |
PSUs granted in 2019 and 2018 | Maximum | Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of award target performance metric | 150.00% |  |
Unvested RSAs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 5 |  |
Vesting period | 1 year |  |
Shares vested (in shares) | 5 |  |
Stock-based compensation expense | $ 0.7 | $ 0.3 | $ 0.3
Fair value of shares vested | 0.5 |  |
Remaining stock-based compensation expense for unvested shares, not yet recognized | $ 0.4 |  |
Stock-based compensation expense, weighted average recognition period (in years) | 8 months 12 days |  |

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