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Significant Customers and Concentration of Credit Risk (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014 products dosing_strength	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer A [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer A [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer A [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer A [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer B [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer B [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer B [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer B [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer C [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer C [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer C [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer C [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer D [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer D [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer D [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer D [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer E [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer E [Member]	Sep. 30, 2014 Sales Revenue, Product Line [Member] Customer E [Member]	Sep. 30, 2013 Sales Revenue, Product Line [Member] Customer E [Member]	Sep. 30, 2014 Accounts Receivable [Member] Customer A [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer A [Member]	Sep. 30, 2014 Accounts Receivable [Member] Customer B [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer B [Member]	Sep. 30, 2014 Accounts Receivable [Member] Customer C [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer C [Member]	Sep. 30, 2014 Accounts Receivable [Member] Customer D [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer D [Member]	Sep. 30, 2014 Accounts Receivable [Member] Customer E [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer E [Member]
Concentration Risk [Line Items]
Number of Commerical Products	1
Number of Dosing Strengths	6
Concentration Risk, Percentage		40.00%	8.00%	44.00%	8.00%	0.00%	64.00%	16.00%	64.00%	27.00%	17.00%	14.00%	17.00%	11.00%	0.00%	5.00%	0.00%	14.00%	6.00%	10.00%	6.00%	39.00%	25.00%	8.00%	11.00%	25.00%	1.00%	10.00%	0.00%	12.00%	54.00%
Gross Revenue of Significant Order	$ 1.5
Net Revenue of Significant Order	$ 0.9

X

- Definition

Gross revenue recognized during the period for a significant order.

+ References

No definition available.

+ Details

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

X

- Definition

Net revenue recognized from a significant order during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Number of Commerical Products

+ References

No definition available.

+ Details

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Namespace Prefix:	gale_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of Dosing Strengths

+ References

No definition available.

+ Details

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Namespace Prefix:	gale_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration