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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
U.S. Pan
Defined Benefit Plan Disclosure [Line Items]
Percentage of employer contribution to employee contribution plan dollar for dollar match	4.00%
Defined contribution plan, employer discretionary contribution amount	$ 0.3	$ 0.2	$ 0.8	$ 0.7
UK Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employee matching contribution, percent of match			3.00%
Defined contribution plan, employer matching contribution, percent of match			5.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay			1.00%
Defined contribution plan, maximum annual contributions per employee, percent			7.00%
Defined contribution plan, total contribution by the company	$ 0.1	$ 0.1	$ 0.3	$ 0.3

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- Definition

Defined contribution plan employer matching contribution percent of match.

+ References

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- Definition

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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