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Share-Based Compensation - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Repurchase of common stock for employee tax withholding obligations amount | $ 601 | $ 1,062 |
Recognition period of unrecognized cost | 1 year 7 months 6 days |  |
Total unrecognized compensation cost related to non-vested stock option awards | $ 3,100 |  |
Maximum |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Share based compensation arrangement performance period | 3 years 4 months 24 days |  |
Requisite service period | 3 years |  |
Minimum [Member] |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Share based compensation arrangement performance period | 1 year 4 months 24 days |  |
Requisite service period | 2 years |  |
2017 Plan |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Useful Term of the plan | 10 years |  |
Common stock shares issuable | 1,750,000 |  |
Shares available for grant | 760,838 |  |
2007 Plan | Performance-based Restricted Stock Units ("PBRS") |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Shares available for grant | 0 |  |
Awards with grant date fair value during the period | $ 3,200 |  |
Liability based PRSU | 1,100 |  | $ 800
Payments to employees | 0 |  | 2,600
Unamortized cost | $ 2,900 |  |
Recognition period of unrecognized cost | 2 years 7 months 6 days |  |
2007 Plan | Restricted Stock Awards And Restricted Stock Units |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Payments to employees | $ 100 | $ 200 |
Repurchase of common stock for employee tax withholding obligations amount, shares | 14,016 | 17,881 |
Repurchase of common stock for employee tax withholding obligations amount | $ 600 | $ 1,100 |
Unamortized cost | $ 5,400 |  |
Recognition period of unrecognized cost | 1 year 2 months 12 days |  |
Liabilities related to restricted stock | $ 200 |  | $ 200
Vested, shares | 3,174,000,000 | 2,815,000,000 |
2007 Plan | Maximum |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Award vesting period | 4 years |  |
2007 Plan | Minimum [Member] |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Award vesting period | 3 years |  |

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