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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

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Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

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