Ferring Asset Purchase Agreement and Discontinued Operations - Operating Results of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product sales		$ 143
Royalty revenue		368
License fee revenue		0
Cost of goods sold		(74)
Cost of Sandoz rights		(10)
Operating expenses		(658)
Other expense		(16)
Gain on sale		12,317
(Loss) income from discontinued operations	$ (24)	$ 12,070
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Product Business Outside The United States [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Product sales	0
Royalty revenue	0
License fee revenue	0
Cost of goods sold	(24)
Cost of Sandoz rights	0
Operating expenses	0
Other expense	0
Gain on sale	0
(Loss) income from discontinued operations	$ (24)