Discontinued Operations - Financial Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other (expense) income:
(Provision) benefit for income taxes from discontinued operations	$ (200)	$ 400	$ (7,000)	$ (700)
Income (loss) from discontinued operations, net of income taxes	388	(1,150)	21,053	2,205
Discontinued Operations, Disposed of by Sale [Member] | Product Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	(1,245)	24,168	13,228	54,662
Operating costs and expenses:
Cost of sales (excluding amortization of intangible assets)	433	6,606	3,601	13,420
Selling, general and administrative	(61)	7,060	5,890	14,549
Research and development	255	4,893	2,791	9,422
Amortization of intangible assets	0	6,934	1,248	13,880
Restructuring - employee severance (Note 12)	(2,439)	0	3,858	0
Total operating costs and expenses	(1,812)	25,493	17,388	51,271
Income (loss) from discontinued operations	567	(1,325)	(4,160)	3,391
Other (expense) income:
Change in fair value of contingent consideration	0	(192)	(1,478)	(483)
Gain on sale of Commercial Product Portfolio	0	0	33,644	0
Total other (expense) income	0	(192)	32,166	(483)
Income (loss) from discontinued operations before income taxes	567	(1,517)	28,006	2,908
(Provision) benefit for income taxes from discontinued operations	(179)	367	(6,953)	(703)
Income (loss) from discontinued operations, net of income taxes	388	(1,150)	21,053	2,205
Proceeds from sale of discontinued operations			158,800
Carrying value of net assets transferred			121,200
Transaction expenses			3,900
Discontinued Operations, Disposed of by Sale [Member] | Product Portfolio [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	(1,245)	23,753	12,938	51,863
Discontinued Operations, Disposed of by Sale [Member] | Product Portfolio [Member] | License and Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	$ 0	$ 415	$ 290	$ 2,799