Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Apr. 30, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Amortization of deferred contract costs	$ 7,200		$ 8,000
Launch delay fees	0		1,400
Contract with customer, liability, including acquisition liabilities, revenue recognized	11,200		14,900
Net losses related to contracts	2,700		1,300
Contract loss provision, current	5,701			$ 6,996
Contract loss provision	297			441
Revenue, remaining performance obligation, amount	792,300
Government assistance, award amount					$ 10,000
Government assistance, award, applied to reimburse costs					$ 10,000
Grant revenue	$ 3,100		$ 0
Geographic Concentration Risk | Revenue Benchmark | Non-US
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Concentration risk, percentage	0.00%		8.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period (in months)	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	60.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	65.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period (in months)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	25.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	30.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period (in months)
IM-2 Mission Contract for Lunar Payload Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Loss on contracts			$ 1,000
Contract with customer, liability, revenue recognized		$ 5,500
Contract loss provision, current				0
IM-3 Mission Contract for Lunar Payload Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Loss on contracts	$ 2,800		$ 200
Contract loss provision, current	$ 5,200			6,500
Long-term contract, percent complete	89.00%
IM-4 Mission Contract for Lunar Payload Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Loss on contracts	$ 51
Contract loss provision, current	$ 500			500
Long-term contract, percent complete	42.00%
Contract loss provision	$ 300			$ 400