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v3.20.4

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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