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Business and Basis of Presentation (Additional Information) (Details) - USD ($) | Aug. 07, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 18,073,000 | $ 18,100,000 | $ 18,083,000 | $ 19,590,000 | $ 29,730,000
Debt instrument, covenant, compensating cash balance |  |  | 13,200,000 |  |  |
Senior Secured Debentures |  |  |  |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 25,500,000.0 |  |  |
Galena Biopharma, Inc | Subsequent Event |  |  |  |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage by Parent | 32.50% |  |  |  |  |
Galena Biopharma, Inc | SELLAS | Subsequent Event |  |  |  |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 67.50% |  |  |  |  |
Out-Of-The-Money Warrants | Subsequent Event |  |  |  |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares availabe from warrants | 2,556,851 |  |  |  |  |
Funding NeuVax in 2019 | Subsequent Event |  |  |  |  |  |
Schedule Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Funding commitment in 2019 | $ 3,000,000 |  |  |  |  |

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