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Subsequent Events (Detail) - USD ($) $ in Thousands	Aug. 07, 2017	May 08, 2013
Subsequent Event [Line Items]
Number of shares availabe from warrants		9,109
Subsequent Event | Out-Of-The-Money Warrants
Subsequent Event [Line Items]
Number of shares availabe from warrants	2,556,851
Galena Biopharma, Inc | Subsequent Event
Subsequent Event [Line Items]
Ownership percentage by Parent	32.50%
Galena Biopharma, Inc | SELLAS | Subsequent Event
Subsequent Event [Line Items]
Percentage of voting interests acquired	67.50%
Termination fee in a merger agreement	$ 750
Expense reimbursement in a merger agreement	$ 100

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- Definition

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+ References

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- Definition

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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