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Commitments and Contingencies (Schedule of Contractual Obligations and Future Cash Payments) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Operating lease expenses	$ 77	$ 139	$ 233

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- Definition

Operating Lease Expense

+ References

No definition available.

+ Details

Name:	gale_OperatingLeaseExpense
Namespace Prefix:	gale_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration