Intangible Assets and Asset Acquisition Obligations - Nucynta Asset Acquisition Obligations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 09, 2018
Intangible Assets and Asset Acquisition Obligations
Annual royalty payable	$ 135,000	$ 135,000
Quarterly royalty payable			$ 33,750
Minimum royalty payable	537,000	$ 537,000
Royalty payment period		45 days
Fair Value of royalty payments	482,300	$ 482,300
Discounted cash flow rate		5.70%
Discount	54,700	$ 54,700
Interest expense	5,943	11,471
Remainder of 2018	10,912	10,912
2019	17,138	17,138
2020	10,907	10,907
2021	4,272	4,272
Minimum royalty payments	$ 51,455	$ 64,500