XML 35 R21.htm IDEA: XBRL DOCUMENT
v3.26.1

REVENUE RECOGNITION (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Revenue from Contract with Customer [Abstract] |
Schedule of Reconciliation of Gross Product Sales to Net Product Sales | The reconciliation of gross product sales to net product sales by each significant category of gross-to-net adjustments was as follows for the three months ended March 31, 2026 and 2025:
|  | Three Months Ended March 31, |  |
(in thousands) |  | 2026 |  | 2025 |  |
Gross product revenue |  | $ | 65,353 |  |  | $ | 45,312 |  |  |
Gross-to-net adjustments: |  |  |  |  |  |
Chargebacks |  | (8,164) |  |  | (4,171) |  |  |
Distributor service fees |  | (2,169) |  |  | (1,526) |  |  |
Government rebates |  | (1,658) |  |  | (66) |  |  |
Sales returns and allowances |  | (1,591) |  |  | (113) |  |  |
Total gross-to-net adjustments |  | (13,582) |  |  | (5,876) |  |  |
Net product revenue |  | $ | 51,771 |  |  | $ | 39,436 |  |  |

X
- Definition Schedule of gross to net sales adjustments. + References No definition available. + Details
Name: | gern_ScheduleOfGrossToNetSalesAdjustmentsTableTextBlock
Namespace Prefix: | gern_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration