Discontinued Operations - Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Other (expense) income:
Provision for income taxes from discontinued operations			$ (200)			$ (6,900)
Income from discontinued operations, net of income taxes		$ 144	388		$ 189	20,975
Sale | Commercial Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		120	(1,245)		(100)	13,124
Operating costs and expenses:
Cost of sales (excluding amortization of intangible assets)		0	433		(229)	3,601
Selling, general and administrative		0	(61)		(1)	5,890
Research and development		(24)	255		(59)	2,791
Amortization of intangible assets		0	0		0	1,248
Restructuring charges - employee severance (Note 11)**		0	2,439	$ 2,400	0	(3,858)
Total operating costs and expenses		(24)	(1,812)		(289)	17,388
Income (loss) from discontinued operations		144	567		189	(4,264)
Other (expense) income:
Change in fair value of contingent consideration		0	0		0	(1,478)
Gain on sale of Commercial Product Portfolio***		0	0		0	33,644
Total other income		0	0		0	32,166
Income from discontinued operations before income taxes		144	567		189	27,902
Provision for income taxes from discontinued operations		0	(179)		0	(6,927)
Income from discontinued operations, net of income taxes		144	388		189	20,975
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		120	(1,245)		(100)	12,834
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	$ 0		$ 0	$ 290