CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Product sales, net	$ 116,517	$ 94,295	$ 221,088	$ 125,966
Royalties	165	209	374	742
Total revenues	116,682	94,504	221,462	126,708
Costs and expenses:
Cost of sales (excluding amortization of intangible assets)	20,965	22,865	44,514	25,977
Research and development expense	7,116	4,714	13,065	6,572
Selling, general and administrative expense	51,903	57,408	104,462	91,950
Amortization of intangible assets	27,037	26,731	54,074	29,271
Total costs and expenses	107,021	111,718	216,115	153,770
Income (loss) from operations	9,661	(17,214)	5,347	(27,062)
Other (expense) income:
Interest and other income	67	61	197	118
Loss on prepayment of Senior Notes	(5,777)		(5,777)
Interest expense	(20,148)	(22,078)	(42,875)	(28,100)
Total other (expense) income	(25,858)	(22,017)	(48,455)	(27,982)
Net loss before income taxes	(16,197)	(39,231)	(43,108)	(55,044)
Benefit from income taxes	5,656	17,578	11,650	21,758
Net loss	$ (10,541)	$ (21,653)	$ (31,458)	$ (33,286)
Basic and diluted net loss per share (in dollars per share)	$ (0.17)	$ (0.36)	$ (0.52)	$ (0.56)
Shares used in computing basic and diluted net loss per share (in shares)	61,166,044	59,991,934	61,032,155	59,777,594