Quarterly report pursuant to Section 13 or 15(d)

Lease Abandonment, Lease Termination and Other Restructuring Costs (Details)

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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.