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v3.20.4

Special Charges - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 7,103,000 | $ 0 | $ 0
Non cash charges | $ 4,400,000 |  |
Restructuring charge, payment term | 12 months |  |
Contract Termination |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 4,700,000 |  |
Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 2,400,000 |  |
Reduction in workforce | employee | 16 |  |

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