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Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Receivables [Abstract] |  |
DOE cost share liabilities | $ 1,776 | $ 10,237

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- 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

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration