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Accounts and Other Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
DOE cost share liabilities	$ 556	$ 1,021

X

- Definition

Department of Energy Cost Share Liability

+ References

No definition available.

+ Details

Name:	smr_DepartmentOfEnergyCostShareLiability
Namespace Prefix:	smr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration