Sale of Zohydro ER business - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 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 loss (income) from discontinued operations	$ 109	$ (379)	$ (582)	$ (169)	$ 3,019	$ (1,635)	$ 79,160	$ (12,696)	$ (1,021)	$ 67,848	$ (52,900)
Zohydro ER [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net product revenue									532	11,299	11,584
Cost of product sold									15	2,205	10,554
Royalty expense									32	835	1,127
Research and development									0	5,504	7,043
Selling, general and administrative									1,594	14,820	54,260
Restructuring expense									0	588	0
Gain on sale of business									0	(89,484)	0
Total operating expense (income)									(1,641)	(65,532)	72,984
Other income									0	5,077	8,500
Net (loss) income from discontinued operations before tax									(1,109)	81,908	(52,900)
Tax benefit (expense)					$ 3,472	$ 5,496	$ 6,946		(88)	(14,060)	0
Net loss (income) from discontinued operations									$ (1,021)	$ 67,848	$ (52,900)