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Commitments and Contingencies - Additional Information (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2026 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Estimated maximum cancellation fees | $ 62.0
Percentage of development costs incurred | 50.00%

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- Definition Estimated maximum cancellation fees. + References No definition available. + Details
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Period Type: | instant

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- Definition Percentage of development costs incurred. + References No definition available. + Details
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Namespace Prefix: | nams_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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