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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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