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Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease cost	$ 2.3	$ 2.3
Short-term lease cost	0.4	0.4
Non-lease component expense	1.5	1.4
Rent expense			$ 3.6
Operating lease, payments	$ 2.6	$ 2.5
Washington, D.C. Lease
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Leased square footage | ft²	33,534
Renewal term of lease agreement	5 years
London Lease
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Leased square footage | ft²	2,880
Renewal term of lease agreement	3 years
Sublease | Washington, D.C. Lease
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Leased square footage | ft²	9,928

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Area of a real estate property.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Operating Lease, Non-Lease Component Expense

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