Sale of Zohydro ER business - Net Gain on Sale (Details) - Zohydro ER [Member] - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 24, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of business before income tax			$ 0	$ 89,484	$ 0
Income tax expense		$ 385
Net gain on sale of business	$ 75,424