XML 46 R34.htm IDEA: XBRL DOCUMENT
v3.23.3

STOCKHOLDERS' EQUITY - 2023 At Market Issuance Sales Agreement (Details) - 2023 Sales Agreement - Subsequent Event | Nov. 01, 2023 USD ($)
--- | ---
At Market Issuance Sales Agreements [Line Items] |
Aggregate offering price of common stock | $ 100,000,000
Maximum commission rate (as a percent) | 3.00%

X
- Definition At Market Issuance Sales Agreements. + References No definition available. + Details
Name: | gern_AtMarketIssuanceSalesAgreementsLineItems
Namespace Prefix: | gern_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate offering price for which the entity may elect to issue and sell shares of its common stock under the sales agreement. + References No definition available. + Details
Name: | gern_CommonStockAggregateOfferingPrice
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of maximum commission rate, based on gross proceeds of sale price per share of common stock sold through sales agent under the sales agreement. + References No definition available. + Details
Name: | gern_MaximumCommissionRate
Namespace Prefix: | gern_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=gern_AtMarketIssuanceTwoThousandAndTwentyThreeSalesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |