Intangible Assets and Asset Acquisition Obligations - Nucynta Asset Acquisition Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 09, 2018
Intangible Assets and Asset Acquisition Obligations
Annual royalty payable	$ 135,000
Quarterly royalty payable		$ 33,750
Minimum royalty payable	$ 537,000
Royalty payment period	45 days
Fair Value of royalty payments	$ 482,300
Discounted cash flow rate	5.70%
Discount	$ 54,700
Interest expense	5,528
Royalty payment due before payment	30,750
Remainder of 2018	16,855
2019	17,138
2020	10,907
2021	4,272
Payment of royalty	13,045
Quarterly payment due	$ 17,705