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Lease Abandonment, Lease Termination and Other Restructuring Costs (Details) ft² in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 04, 2024 USD ($) paymentInstallment | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | [1] | Jun. 28, 2024 ft²
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Lease abandonment/termination gain (loss) |  | $ 652 |  | $ 0 | $ (12,205) | [1] | $ 0 |
Alexandria, VA |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Lease abandonment/termination gain (loss) |  | 700 |  |  |  |  |  |
Reduction in operating lease right-of-use assets |  | 400 |  |  |  |  |  |
Operating lease, contract termination, liability | $ 12,000 | 12,000 |  |  | 12,000 |  |  |
Number of installment payments | paymentInstallment | 2 |  |  |  |  |  |  |
Decrease in operating lease liability |  | 1,100 |  |  |  |  |  |
Alexandria, VA | Accrued Expenses And Other Current Liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Operating lease, contract termination, liability |  | 6,000 |  |  | 6,000 |  |  |
Alexandria, VA | Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Operating lease, contract termination, liability |  | 6,000 |  |  | 6,000 |  |  |
Contract Termination | Vienna, VA |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net rentable area (in square foot) | ft² |  |  |  |  |  |  |  | 4
Lease Abandonment | Contract Termination | Alexandria, VA |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Net rentable area (in square foot) | ft² |  |  |  |  |  |  |  | 95
Lease abandonment/termination gain (loss) |  |  | $ (12,900) |  |  |  |  |
Reduction in operating lease right-of-use assets |  |  | 6,700 |  |  |  |  |
Exit and disposal costs |  |  | 3,700 |  |  |  |  |
Lease Abandonment | Contract Termination | Alexandria, VA | Leasehold Improvements |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Tangible asset impairment charges |  |  | $ 2,500 |  |  |  |  |
Cancellation of contracts and leasing agreements | Other Restructuring |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  | 200 |  |  | 4,000 |  |  |
Restructuring reserve |  | $ 800 |  |  | $ 800 |  |  |
[1] | (a) The cash flows related to discontinued operations and held-for-sale assets and liabilities have not been segregated, and remain included in the major classes of assets and liabilities. Accordingly, the Consolidated Statements of Cash Flows include the results of continuing and discontinued operations.

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