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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Dec. 31, 2013 item
Organization
Number of therapeutic products available for sale	0

X

- Definition

Represents the number of therapeutic products available for commercial sale by the company.

+ References

No definition available.

+ Details

Name:	gern_NumberOfProductsAvailableForSale
Namespace Prefix:	gern_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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