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Legal Proceedings, Commitments and Contingencies - Schedule of Contractual Obligations and Future Cash Payments (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating lease expenses	$ 291,000	$ 116,000	$ 72,000
Operating lease payment due upon lease termination	$ 0

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- Definition

Operating Lease Expense

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No definition available.

+ Details

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

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- Definition

Operating Leases Future Minimum Payments Due Upon Termination of Leases

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No definition available.

+ Details

Name:	gale_OperatingLeasesFutureMinimumPaymentsDueUponTerminationofLeases
Namespace Prefix:	gale_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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