XML 35 R24.htm IDEA: XBRL DOCUMENT v3.10.0.1

COLLABORATION AGREEMENT (Details)	Dec. 15, 2014 USD ($) item	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Collaborative Arrangements [Line Items]
Accrued collaboration charges		$ 2,192,000	$ 1,702,000
Janssen Biotech | Collaboration Agreement
Collaborative Arrangements [Line Items]
Upfront payment received	$ 35,000,000
Number of agreed upon studies | item	2
Percentage of costs to be paid by Geron	50.00%
Percentage of costs to be paid by Janssen	50.00%
Accrued collaboration charges		$ 2,192,000
Janssen Biotech | Collaborative Arrangement IP Exclusively Licensed
Collaborative Arrangements [Line Items]
Percentage of costs to be paid by Geron	50.00%
Percentage of costs to be paid by Janssen	50.00%
Janssen Biotech | U.S. Opt-In Rights Exercised Collaboration Agreement
Collaborative Arrangements [Line Items]
Percentage of costs to be paid by Geron	20.00%
Percentage of costs to be paid by Janssen	80.00%
Continuation Election milestone payment	$ 65,000,000
Aggregate maximum total payments for development and regulatory milestones under collaboration agreement	470,000,000
Aggregate maximum total of payments for sales milestones under collaboration agreement	$ 350,000,000
Tiered royalties percentage, low end of the range	mid-teens
Tiered royalties percentage, high end of the range	low twenties
U.S. selling effort percentage	20.00%
Janssen Biotech | U.S. Opt-In Rights Not Exercised Collaboration Agreement
Collaborative Arrangements [Line Items]
Continuation Election milestone payment	$ 65,000,000
Aggregate maximum total payments for development and regulatory milestones under collaboration agreement	415,000,000
Aggregate maximum total of payments for sales milestones under collaboration agreement	$ 350,000,000
Tiered royalties percentage, low end of the range	double-digit
Tiered royalties percentage, high end of the range	mid-teens
Full U.S. Rights fee	$ 70,000,000

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable to collaboration partner for which invoices have not yet been received under the respective collaboration agreement (due within one year or within the normal operating cycle if longer).

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementAccruedCollaborationChargesCurrent
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Collaborative arrangement continuation election milestone payment to be received.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementContinuationElectionMilestonePaymentToBeReceived
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the percentage of costs that Janssen must pay during certain phases of the agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the percentage of costs that Geron must pay during certain phases of the agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Collaborative arrangement full rights fee to be received from counterparty.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementFullRightsFeeToBeReceivedFromCounterparty
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Collaborative arrangement maximum additional potential payment to be received for achievement of certain sales milestones.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementMaximumAdditionalPotentialPaymentToBeReceivedForAchievementOfCertainSalesMilestones
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Collaborative arrangement maximum additional potential payment to be received upon achievement of certain development and regulatory milestones.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementMaximumAdditionalPotentialPaymentToBeReceivedUponAchievementOfCertainDevelopmentAndRegulatoryMilestones
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of agreed upon studies.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the percentage of sales effort that Geron can provide in lieu of funding the same percentage of promotion costs upon regulatory approval and commercial launch of imetelstat in the U.S.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the high end of the range of tiered royalty percentages to be applied to worldwide net sales of imetelstat.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementTieredRoyaltiesPercentageHighEndOfRange
Namespace Prefix:	gern_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the low end of the range of tiered royalty percentages to be applied to worldwide net sales of imetelstat.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementTieredRoyaltiesPercentageLowEndOfRange
Namespace Prefix:	gern_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Collaborative arrangements.

+ References

No definition available.

+ Details

Name:	gern_CollaborativeArrangementsLineItems
Namespace Prefix:	gern_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Upfront payment received from Janssen upon effectiveness of Collaboration Agreement.

+ References

No definition available.

+ Details

Name:	gern_UpfrontPaymentReceivedUnderCollaborationAgreementFromCounterparty
Namespace Prefix:	gern_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_CounterpartyNameAxis=gern_JanssenBiotechIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=gern_CollaborativeArrangementIPExclusivelyLicensedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=gern_USOptInRightsExercisedCollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=gern_USOptInRightsNotExercisedCollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: