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Revenue - Wholesale Capacity Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Nov. 05, 2024	Dec. 31, 2023	Nov. 30, 2022
Disaggregation of Revenue [Line Items]
Advanced payments contractually owed for services expected to be performed with the replacement satellite constellation prior to the Phase 2 Service Period	$ 67,500
Total contract liabilities	1,212,861	$ 868,950
Service agreement, whole fees payment			$ 13,300
Warrants issued	40,800				$ 48,300
2023 13% Notes
Disaggregation of Revenue [Line Items]
Loan interest rate				13.00%
Wholesale capacity services
Disaggregation of Revenue [Line Items]
Advanced payments contractually owed for services expected to be performed with the replacement satellite constellation prior to the Phase 2 Service Period	0	3,924
Contract asset	(50,958)	(40,889)
Total contract liabilities	1,195,276	850,563
Wholesale capacity services \| Accounting Standards Update 2025-07
Disaggregation of Revenue [Line Items]
Additional consideration associated with the 2021 and 2023 Funding Agreements	58,780	0
Wholesale capacity services \| Ground component
Disaggregation of Revenue [Line Items]
Advanced payments	18,836	20,155
Wholesale capacity services \| Advanced payments for the quarterly access fee, service-related operating and capital expenditures and other services
Disaggregation of Revenue [Line Items]
Advanced payments	35,678	37,682
Wholesale capacity services \| Future Phase
Disaggregation of Revenue [Line Items]
Advanced payments	918,165	708,593
Wholesale capacity services \| Space component
Disaggregation of Revenue [Line Items]
Other advanced payments associated with future performance obligations	83,239	60,674
2021 and 2023 Funding Agreement \| Wholesale capacity services
Disaggregation of Revenue [Line Items]
Additional consideration associated with the 2021 and 2023 Funding Agreements	6,020	6,920
Updated Service Agreement
Disaggregation of Revenue [Line Items]
Funding agreement, consideration of financing amount	116,800
Updated Service Agreement \| Wholesale capacity services
Disaggregation of Revenue [Line Items]
Additional consideration associated with the 2021 and 2023 Funding Agreements	$ 125,516	$ 53,504