Intangible Assets and Goodwill - Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-lived intangible asset
Accumulated Amortization	$ (7,399)	$ (6,503)
Total Intangible Assets
Gross carrying amount of total intangible assets, net	74,990	87,990
Net carrying amount of total intangible assets, net	67,591	81,487
In-Process Research and Development Impairment	$ 13,000
License Rights
Finite-lived intangible asset
Estimated Life	16 years
Gross carrying amount finite-lived	$ 14,500	14,500
Accumulated Amortization	(7,399)	(6,503)
Net carrying amount finite-lived	7,101	7,997
IPR&D
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	60,490	73,490
Net carrying amount of indefinite-lived	$ 60,490	$ 73,490