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Acquisition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Business combination pro forma transaction costs   $ 8,700
Success fee and other transaction costs   $ 4,800
Stock issued for incentive fee payment in connection with acquisition during period shares   119,672
Stock issued for incentive fee payment in connection with acquisition during period   $ 941
Severance costs $ 0 1,883
Production related impairments or charges   5,200
Galena Biopharma, Inc    
Business Acquisition [Line Items]    
Business combination pro forma transaction costs   $ 5,700