Discontinued Operations - Significant Non-cash Supplemental Cash Flow Items of Discontinued Operations (Details) - Product Portfolio [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 1,263	$ 6,969
Stock-based compensation	3,405	1,593
Change in fair value of contingent consideration	$ 1,478	$ 291