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Legal Proceedings, Commitments and Contingencies - Summary of Litigation Settlements (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |
Total settlements | $ 27,750 |  |
Payable by the Company in cash | 950 |  |
Paid by the insurance carriers | 21,700 |  |
Paid by the Company in cash | 2,450 |  |
Paid by the Company in common stock | 2,650 | $ 1,000 | $ 0
Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI |  |  |
Loss Contingencies [Line Items] |  |  |
Total settlements | 20,000 |  |
Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI |  |  |
Loss Contingencies [Line Items] |  |  |
Total settlements | 5,000 |  |
Shareholders Securities Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Total settlements | 1,800 |  |
SEC Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Total settlements | $ 950 |  |

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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