Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Carrying Amount	$ 10,796	$ 11,318
Finite Lived Intangible Assets, Accumulated Amortization	2,114	1,792
Finite Lived Intangible Assets, Net Book Value	8,682	9,526
Indefinite-Lived Intangible Assets, Impairment	4,964	4,017
Intangible Assets, Gross Carrying Amount	25,686	30,944
Intangible assets, Net Book Value	18,608	25,135
License agreement
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Gross Carrying Amount	10,796	11,318
Finite Lived Intangible Assets, Accumulated Amortization	2,114	1,792
Finite Lived Intangible Assets, Net Book Value	8,682	9,526
Acquired IPR&D assets
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross Carrying Amount	14,890	19,626
Indefinite-Lived Intangible Assets, Impairment	4,964	4,017
Indefinite-Lived Intangible Assets, Net Book Value	$ 9,926	$ 15,609