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Leases - Lease Abandonment and Termination (Details) ft² in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 04, 2024 USD ($) paymentInstallment | Jun. 28, 2024 USD ($) ft² | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Lease abandonment/termination gain (loss) | [1] |  |  | $ (12,205) | $ 0 | $ 0
Alexandria, VA |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Lease abandonment/termination gain (loss) |  | $ 700 |  |  |  |
Reduction in operating lease right-of-use assets |  | 400 |  | 6,000 |  |
Operating lease, contract termination, liability |  | $ 12,000 |  | 12,000 |  |
Number of installment payments | paymentInstallment |  | 2 |  |  |  |
Decrease in operating lease liability |  | $ 1,100 |  |  |  |
Alexandria, VA | Other Long-term Liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating lease, contract termination, liability |  |  |  | $ 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 |  |  |
[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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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of increase (decrease) in obligation for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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