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STOCKHOLDERS' EQUITY (Details 5)	12 Months Ended
	Dec. 31, 2014
STOCKHOLDERS' EQUITY
Canceled/forfeited (in shares)	(142,375)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
2014 Employee Stock Purchase Plan
STOCKHOLDERS' EQUITY
Shares of common stock reserved for issuance	1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Shares issued under plan	24,375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Maximum percentage of annual salary that can be withheld	10.00%gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Maximum duration of offering period	12 months
Number of offering periods in which an employee can participate at a time	1gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Number of consecutive purchase periods in an offering period	2gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Duration of the purchase period	6 months
Percentage applied to common stock market value in calculating purchase price under purchase plan	85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Duration of the new offering period	12 months
1996 Employee Stock Purchase Plan
STOCKHOLDERS' EQUITY
Shares issued under plan	968,829us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = gern_EmployeeStockPurchasePlan1996Member
Canceled/forfeited (in shares)	231,171us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = gern_EmployeeStockPurchasePlan1996Member

X

- Definition

Represents the duration of new offering period in a case where the fair market value of common stock on the purchase date is less than the fair market value at the beginning of the offering period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Represents the duration of the purchase period under the employee stock purchase 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 maximum duration of the offering period under the employee stock purchase 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 offering periods in which an employee can participate at a time in the purchase plan.

+ References

No definition available.

+ Details

Name:	gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime
Namespace Prefix:	gern_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum percentage of annual salary that an employee can choose to have withheld to purchase common stock under the purchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of consecutive purchase periods in an offering period in the purchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	gern_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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