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Other Income (Expense) Table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income and Expenses [Abstract]
Change in fair value of the contingent purchase price liability	$ (5,497)	$ (83)	$ (5,327)	$ 238

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- Definition

Change in the fair value of contingent purchase price consideration.

+ References

No definition available.

+ Details

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Namespace Prefix:	gale_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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