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Commitments and Contingencies (Schedule of Contractual Obligations and Future Cash Payments) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
--- | ---
Loss Contingencies [Line Items] |
2014 | $ 847
2015 | 724
2016 | 533
2017 | 432
2018 | 6,935
Total | 9,471
Operating Leases [Member] |
Loss Contingencies [Line Items] |
2014 | 72
2015 | 74
2016 | 83
2017 | 82
2018 | 70
Total | 381
Non-Cancelable Employment Agreements [Member] |
Loss Contingencies [Line Items] |
2014 | 450
2015 | 300
2016 | 100
2017 | 0
2018 | 0
Total | 850
Subtotal [Member] |
Loss Contingencies [Line Items] |
2014 | 522
2015 | 374
2016 | 183
2017 | 82
2018 | 70
Total | 1,231
Cancelable License Agreements [Member] |
Loss Contingencies [Line Items] |
2014 | 325
2015 | 350
2016 | 350
2017 | 350
2018 | 6,865
Total | $ 8,240

X
- Definition Contractual Obligations Current Due + References No definition available. + Details
Name: | gale_ContractualObligationsCurrentDue
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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