CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Product sales, net	$ 110,303	$ 104,726	$ 331,391	$ 230,692
Royalties	221	130	595	872
Total revenues	110,524	104,856	331,986	231,564
Costs and expenses:
Cost of sales (excluding amortization of intangible assets)	20,243	20,914	64,757	46,891
Research and development expense	10,412	4,629	23,477	11,201
Selling, general and administrative expense	51,574	49,065	156,036	141,015
Amortization of intangible assets	27,037	27,013	81,111	56,284
Total costs and expenses	109,266	101,621	325,381	255,391
Income (loss) from operations	1,258	3,235	6,605	(23,827)
Other (expense) income:
Interest and other income	113	62	310	180
Loss on prepayment of Senior Notes			(5,777)
Interest expense	(20,307)	(22,634)	(63,182)	(50,733)
Total other expense	(20,194)	(22,572)	(68,649)	(50,553)
Net loss before income taxes	(18,936)	(19,337)	(62,044)	(74,380)
Benefit from income taxes	6,042	7,552	17,692	29,310
Net loss	$ (12,894)	$ (11,785)	$ (44,352)	$ (45,070)
Basic and diluted net loss per share (in dollars per share)	$ (0.21)	$ (0.20)	$ (0.73)	$ (0.75)
Shares used in computing basic and diluted net loss per share (in shares)	61,422,015	60,320,369	61,163,059	59,960,507