Sale of Zohydro ER business - Income Statement and Balance Sheet Disclosures Related to Zohydro (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 24, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense		$ (13,500)
Net income (loss) from discontinued operations before tax		79,160	$ (14,672)	$ 66,464	$ (30,651)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total current assets of discontinued operations		5,796		5,796		$ 7,196
Total current liabilities of discontinued operations		9,990		9,990		22,307
Zohydro ER
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net product revenue		4,173	2,425	9,179	2,710
Cost of product sold		612	446	1,952	495
Royalty expense		291	263	708	359
Research and development		1,020	957	5,829	1,954
Selling, general and administrative		3,097	15,431	14,233	30,553
Restructuring expense		568	0	568	0
Gain on sale of business	$ (89,053)	(89,053)	0	(89,053)	0
Total operating (income) expenses		(83,465)	17,097	(65,763)	33,361
Other income		5,000	0	5,000	0
Net income (loss) from discontinued operations before tax		92,638	(14,672)	79,942	(30,651)
Income tax expense		(13,478)	0	(13,478)	0
Net income (loss) from discontinued operations before tax		79,160	$ (14,672)	66,464	$ (30,651)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Trade accounts receivable		365		365		2,799
Inventory		251		251		1,995
Prepaid expenses and other current assets		5,180		5,180		2,402
Total current assets of discontinued operations		5,796		5,796		7,196
Other assets		231		231		2,673
Total assets of discontinued operations	$ (2,516)	6,027		6,027		9,869
Accounts payable		1,875		1,875		3,781
Accrued expenses		5,814		5,814		9,470
Accrued compensation		376		376		1,933
Deferred revenue		1,925		1,925		7,123
Total current liabilities of discontinued operations		9,990		9,990		22,307
Total liabilities of discontinued operations		$ 9,990		$ 9,990		$ 22,307