Leases - Additional Information (Detail) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2022
USD ($)
ft²
|
Dec. 31, 2021
USD ($)
|
Dec. 31, 2020
USD ($)
|
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Operating lease cost | $ 2.2 | $ 2.3 | $ 2.3 |
| Short-term lease cost | 0.4 | 0.4 | 0.4 |
| Non-lease component expense | 1.4 | 1.4 | 1.5 |
| Operating lease, payments | $ 2.6 | $ 2.3 | $ 2.6 |
| 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 | ||
| Washington, D.C. Lease | Sublease | |||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Leased square footage | ft² | 9,928 | ||
| London Lease | |||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Leased square footage | ft² | 2,880 | ||