CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenues	$ 63,274	$ 100,457	$ 191,678	$ 190,904
Costs and expenses:
Cost of sales (excluding amortization of intangible assets)	2,753	19,725	14,797	37,499
Research and development expenses	2,180	5,614	3,708	10,698
Selling, general and administrative expenses	31,308	50,010	60,341	98,529
Amortization of intangible assets	25,444	25,735	50,888	51,470
Restructuring charges	5,814	3,441	14,831	3,441
Total costs and expenses	67,499	104,525	144,565	201,637
(Loss) income from operations	(4,225)	(4,068)	47,113	(10,733)
Other income (expense):
Interest and other income	67	282	296	532
Loss on prepayment of Senior Notes		(5,364)		(5,364)
Interest expense	(17,010)	(17,758)	(35,078)	(37,882)
Total other expense	(16,943)	(22,840)	(34,782)	(42,714)
Net (loss) income before income taxes	(21,168)	(26,908)	12,331	(53,447)
Benefit from income taxes	120	249	445	47
Net (loss) income	$ (21,048)	$ (26,659)	$ 12,776	$ (53,400)
Basic net (loss) income per share (in dollars per share)	$ (0.33)	$ (0.43)	$ 0.20	$ (0.86)
Diluted net (loss) income per share (in dollars per share)	$ (0.33)	$ (0.43)	$ 0.20	$ (0.86)
Shares used in computing basic net (loss) income per share (in shares)	63,718,562	62,531,696	63,611,160	62,331,471
Shares used in computing diluted net (loss) income per share (in shares)	63,718,562	62,531,696	64,107,109	62,331,471
Product sales, net
Revenues:
Total revenues	$ 26,838	$ 100,232	$ 71,192	$ 190,517
Commercialization agreement
Revenues:
Total revenues	31,179		114,979
Royalties and milestones
Revenues:
Total revenues	$ 5,257	$ 225	$ 5,507	$ 387