XML 27 R71.htm IDEA: XBRL DOCUMENT
v2.4.1.9

SUBSEQUENT EVENT (Details) (Subsequent event, USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 03, 2015 position | Dec. 31, 2015 position
Subsequent event |  |
SUBSEQUENT EVENT |  |
Number of positions before organizational resizing | 39gern_RestructuringAndRelatedCostNumberOfPositionsBeforeResizing / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Number of positions after organizational resizing | 21gern_RestructuringAndRelatedCostNumberOfPositionsAfterResizing / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Restructuring workforce reduction percentage | 46.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Aggregate potential restructuring charges |  | $ 1,900,000gern_AggregateRestructuringChargesExpectedToBeIncurred / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Expected cash payments |  | $ 1,500,000gern_RestructuringChargesExpectedToBeSettledWithCash / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of positions eliminated |  | 18us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Total projected restructuring charges expected to be incurred pursuant to a duly authorized plan. + References No definition available. + Details
Name: | gern_AggregateRestructuringChargesExpectedToBeIncurred
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of positions after resizing. + References No definition available. + Details
Name: | gern_RestructuringAndRelatedCostNumberOfPositionsAfterResizing
Namespace Prefix: | gern_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of positions before resizing. + References No definition available. + Details
Name: | gern_RestructuringAndRelatedCostNumberOfPositionsBeforeResizing
Namespace Prefix: | gern_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of cash expected to be paid in a future period to settle projected restructuring charges to be incurred pursuant to a duly authorized plan. + References No definition available. + Details
Name: | gern_RestructuringChargesExpectedToBeSettledWithCash
Namespace Prefix: | gern_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration