Sale of Zohydro ER business - Income Statement and Balance Sheet Disclosures Related to Zohydro (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 24, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense		$ (2,520)		$ (15,998)
Net income (loss) from discontinued operations before tax		(1,635)	$ (11,364)	64,829	$ (41,952)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total current assets of discontinued operations		3,782		3,782		$ 7,196
Total current liabilities of discontinued operations		5,153		5,153		22,307
Zohydro ER
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net product revenue		1,280	3,914	10,459	6,624
Cost of product sold		182	706	2,134	1,201
Royalty expense		77	353	785	712
Research and development		(232)	2,377	5,596	4,331
Selling, general and administrative		472	11,842	14,706	42,332
Restructuring expense		20	0	588	0
Gain on sale of business	$ (89,099)	(46)	0	(89,099)	0
Total operating (income) expense		473	15,278	(65,290)	48,576
Other income		78	0	5,078	0
Net income (loss) from discontinued operations before tax		885	(11,364)	80,827	(41,952)
Income tax expense		(2,520)	0	(15,998)	0
Net income (loss) from discontinued operations before tax		(1,635)	$ (11,364)	64,829	$ (41,952)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Trade accounts receivable		53		53		2,799
Inventory		69		69		1,995
Prepaid expenses and other current assets		3,660		3,660		2,402
Total current assets of discontinued operations		3,782		3,782		7,196
Other assets		4		4		2,673
Total assets of discontinued operations	$ (2,532)	3,786		3,786		9,869
Accounts payable		384		384		3,781
Accrued expenses		4,181		4,181		9,470
Accrued compensation		0		0		1,933
Deferred revenue		588		588		7,123
Total current liabilities of discontinued operations		5,153		5,153		22,307
Total liabilities of discontinued operations		$ 5,153		$ 5,153		$ 22,307