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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,914	$ 1,914	$ 1,914
Impairment loss		9,550	0
Intangible assets	8,500	8,500	17,600
GALE-401
Finite-Lived Intangible Assets [Line Items]
Intangible assets	0	0	9,100
IPR&D | GALE-401
Finite-Lived Intangible Assets [Line Items]
Impairment loss	9,600
Intangible assets			$ 9,100
Upfront milestone payments, deposits and other assets	500	$ 500
Income tax expense (benefit)	$ (1,400)

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Indefinite-lived Intangible Assets, Income Tax Effect Of Abandonment

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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