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