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COMMITMENTS AND CONTINGENCIES - Severance Plan (Details) - Severance Plan	12 Months Ended
	Dec. 31, 2016
COMMITMENTS AND CONTINGENCIES
Period within which employee is terminated by entity without cause following a change of control	12 months
Period within which no comparable employment is offered by the entity following a change of control	30 days
Period within which employee resigns following a change of control due to material change in terms of employment	12 months
Minimum
COMMITMENTS AND CONTINGENCIES
Period of base salary to be considered for severance payments	2 months
Maximum
COMMITMENTS AND CONTINGENCIES
Period of base salary to be considered for severance payments	18 months

X

- Definition

Maximum number of months of an employee's then current base salary to be paid as severance under severance plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum number of months of an employee's then current base salary to be paid as severance under severance plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of months following a change in control when an employee is terminated without cause to be classified as a triggering event for severance payments.

+ References

No definition available.

+ Details

Name:	gern_LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod
Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period following change of control within which an employee is not offered comparable employment (new or continuing) by the entity or its successor or acquired and to be considered as triggering event for severance payments.

+ References

No definition available.

+ Details

Name:	gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity
Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period within which employee resigns following a change of control due to material change in terms of employment and to be considered as triggering event for severance payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
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