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	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 1,263	$ 13,925
Stock-based compensation	3,404	3,146
Change in fair value of contingent consideration	$ 1,311	$ 291