Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Revenue	$ 50,987	$ 58,478	$ 163,824	$ 173,338
Related Party | SNS | KBR, Inc.
Related Party Transaction [Line Items]
Equity ownership percentage	10.00%		10.00%
IBX/PTX | Related Party
Related Party Transaction [Line Items]
Management fee expense	$ 0	30	$ 0	54
Accounts payable	0		0		$ 0
KBR, Inc. | Related Party
Related Party Transaction [Line Items]
Revenue	400	200	1,500	1,500
Accounts receivable	300		300		400
KBR, Inc. | Related Party | SNS
Related Party Transaction [Line Items]
Cost of revenue (excluding depreciation)	5,300	8,500	17,100	27,100
Accounts payable related to cost of revenue	2,100		2,100		2,500
ASES | Related Party
Related Party Transaction [Line Items]
Revenue	300	100	900	500
Accounts receivable	100		100		100
X Energy, LLC | Related Party
Related Party Transaction [Line Items]
Management fee expense	0	100	500	300
Accounts payable	0		0
Aerodyne | Related Party | SNS
Related Party Transaction [Line Items]
Accounts payable	100		100		0
Cost of revenue (excluding depreciation)	400		1,600
Axion Space, Inc. | Related Party
Related Party Transaction [Line Items]
Revenue	300	$ 0	300	$ 50
Accounts receivable	$ 300		$ 300		$ 0