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Legal Proceedings, Commitments and Contingencies (Details) $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 05, 2018 USD ($)	Oct. 23, 2018 counterclaim	May 18, 2018 USD ($) counterclaim	Jul. 24, 2017 USD ($)	Nov. 14, 2018 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 24, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Gain on extinguishment of debt							$ 766	$ 0	$ 766	$ 0
JGB (Cayman) Newton Ltd
Loss Contingencies [Line Items]
Legal fees							$ 2,500
Loss contingency, number of counterclaims | counterclaim			7
Pending Litigation | Patel vs Galena biopharma, Inc
Loss Contingencies [Line Items]
Payments for legal settlement				$ 50
Litigation settlement with issuance of common stock				$ 1,250
Secured Debt
Loss Contingencies [Line Items]
Restricted cash											$ 8,500
Secured Debt | Amendment Agreement
Loss Contingencies [Line Items]
Restricted cash			$ 8,500									$ 10,200
Subsequent Event
Loss Contingencies [Line Items]
Litigation settlement insurance recovery						$ 500
Subsequent Event | JGB (Cayman) Newton Ltd
Loss Contingencies [Line Items]
Legal fees					$ 2,500
Restricted cash	$ 1,600
Loss contingency, number of counterclaims | counterclaim		4
Loss contingency, damages awarded, value	6,600
Gain on extinguishment of debt	$ 800				$ 800

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