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Nature of business (Details)	12 Months Ended
Nature of business (Details)	Dec. 31, 2025 subsidiary
Nature of business
Number of wholly owned subsidiaries	2

X

- Definition

n/a.

+ References

No definition available.

+ Details

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Namespace Prefix:	ngen_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The number of wholly owned subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ngen_
Data Type:	xbrli:integerItemType
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Period Type:	duration