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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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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