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License Agreements (Details)	6 Months Ended
License Agreements (Details)	Jun. 30, 2019 USD ($)
Mayo Agreement [Member]
Amount paid in license agreement	$ 200,000

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- Definition

Amount paid in license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	hgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: