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Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
Related Party Transactions (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Nov. 12, 2020
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Revenue	$ 58,478,000	$ 12,731,000	$ 173,338,000	$ 48,960,000
Related Party \| KBR, Inc. \| SNS
Related Party Transaction [Line Items]
Equity ownership percentage	10.00%		10.00%			10.00%
Related Party \| Axiom Space, Inc
Related Party Transaction [Line Items]
Revenue	$ 0	29,000	$ 50,000	153,000
Accounts receivable	0		0
Related Party \| IBX/PTX
Related Party Transaction [Line Items]
Management fee expense	30,000	205,000	54,000	1,700,000
Accounts payable	55,000		55,000		$ 2,700,000
Related Party \| KBR, Inc.
Related Party Transaction [Line Items]
Revenue	200,000	900,000	1,500,000	2,300,000
Accounts receivable	400,000		400,000		500,000
Related Party \| KBR, Inc. \| SNS
Related Party Transaction [Line Items]
Cost of revenue (excluding depreciation)	8,500,000		27,100,000
Accounts payable related to cost of revenue	5,900,000		5,900,000		2,900,000
Related Party \| ASES
Related Party Transaction [Line Items]
Revenue	85,000	305,000	496,000	803,000
Accounts receivable	47,000		47,000		115,000
Related Party \| X Energy, LLC
Related Party Transaction [Line Items]
Management fee expense	58,000	$ 0	333,000	$ 0
Accounts payable	$ 0		$ 0		$ 0