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Common Stock Incentive Plan - Summary (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Oct. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock Incentive Plan |  |  |  |  |
Severance charge | $ 3,500 | $ 28,300 |  |  |
Incremental severance charge |  | 18,700 |  |  |
Compensation accrual prior to separation |  | 9,600 |  |  |
Share-based compensation costs related to accelerated equity awards |  |  |  |  | $ 11,800
Cash |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Severance charge | 1,600 | 9,800 |  |  |
Share-based compensation |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Severance charge | 1,800 | 17,900 |  |  |
Professional fees |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Severance charge | $ 58 | $ 574 |  |  |
General and administrative expense |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Share-based compensation costs recognized |  |  | $ 16,500 | $ 13,700 | $ 27,300
2012 Plan |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Plan term from the date of adoption |  |  | 10 years |  |
2012 Plan | Maximum |  |  |  |  |
Common Stock Incentive Plan |  |  |  |  |
Authorized shares |  |  | 3,985,734 |  |

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