Discontinued Operations - Financial Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other income (expense):
Provision for income taxes from discontinued operations	$ (6,800)	$ (1,100)
Income from discontinued operations, net of income taxes	20,665	3,356
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	14,473	30,495
Operating costs and expenses:
Cost of sales (excluding amortization of intangible assets)	3,168	6,813
Selling, general and administrative	5,951	7,488
Research and development	2,536	4,530
Amortization of intangible assets	1,248	6,947
Restructuring - employee severance (Note 12)	6,297	0
Total operating costs and expenses	19,200	25,778
Loss from discontinued operations	(4,727)	4,717
Other income (expense):
Change in fair value of contingent consideration	(1,478)	(291)
Gain on sale of Commercial Product Portfolio	33,644	0
Total other income (expense)	32,166	(291)
Income from discontinued operations before income taxes	27,439	4,426
Provision for income taxes from discontinued operations	(6,774)	(1,070)
Income from discontinued operations, net of income taxes	20,665	3,356
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	14,183	28,111
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	$ 290	$ 2,384