Discontinued Operations - Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 01, 2019	Mar. 31, 2020	Mar. 31, 2019
Other (expense) income:
Provision for income taxes from discontinued operations			$ (6,700)
Income from discontinued operations, net of income taxes		$ 45	20,587
Sale | Commercial Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		(220)	14,369
Operating costs and expenses:
Cost of sales (excluding amortization of intangible assets)		(229)	3,168
Selling, general and administrative		(1)	5,951
Research and development		(35)	2,536
Amortization of intangible assets		0	1,248
Restructuring charges - employee severance (Note 11)		0	6,297
Total operating costs and expenses		(265)	19,200
Income (loss) from discontinued operations		45	(4,831)
Other (expense) income:
Change in fair value of contingent consideration		0	(1,478)
Gain on sale of Commercial Product Portfolio**		0	33,644
Total other (expense) income		0	32,166
Income from discontinued operations before income taxes		45	27,335
Provision for income taxes from discontinued operations		0	(6,748)
Income from discontinued operations, net of income taxes		45	20,587
Proceeds from sale of discontinued operations	$ 158,800
Carrying value of net assets transferred	121,200
Transaction expenses	$ 3,900
Sale | Commercial Product Portfolio | Product
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		(220)	14,079
Sale | Commercial Product Portfolio | License fees and service revenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		$ 0	$ 290