CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 55,147,000	$ 77,493,000	$ 170,278,000	$ 269,171,000
Costs and expenses:
Cost of sales (excluding amortization of intangible assets)	2,243,000	2,975,000	6,942,000	17,772,000
Research and development expenses	1,476,000	2,127,000	4,531,000	5,835,000
Selling, general and administrative expenses	36,117,000	33,409,000	85,917,000	93,750,000
Amortization of intangible assets	25,444,000	25,443,000	76,331,000	76,331,000
Restructuring charges	0	3,911,000	0	18,742,000
Total costs and expenses	65,280,000	67,865,000	173,721,000	212,430,000
(Loss) income from operations	(10,133,000)	9,628,000	(3,443,000)	56,741,000
Other income (expense):
Litigation settlement	0	62,000,000	0	62,000,000
Gain on debt extinguishment	26,385,000	0	26,385,000	0
Interest expense	(13,872,000)	(17,190,000)	(45,268,000)	(52,268,000)
Other (expense) income, net	(764,000)	677,000	(2,613,000)	973,000
Total other expense (income)	11,749,000	45,487,000	(21,496,000)	10,705,000
Net income (loss) before income taxes	1,616,000	55,115,000	(24,939,000)	67,446,000
Income tax benefit (expense)	1,715,000	(6,845,000)	364,000	(6,400,000)
Net income (loss)	3,331,000	48,270,000	(24,575,000)	61,046,000
Other comprehensive income:
Unrealized gain on available-for-sale securities, net of tax	0	0	0	1,000
Comprehensive income (loss)	$ 3,331,000	$ 48,270,000	$ (24,575,000)	$ 61,047,000
Basic net income (loss) per share (in dollars per share)	$ 0.05	$ 0.76	$ (0.36)	$ 0.96
Diluted net income (loss) per share (in dollars per share)	$ 0.05	$ 0.65	$ (0.36)	$ 0.93
Shares used in computing basic net income (loss) per share (in shares)	72,747	63,917	67,332	63,714
Shares used in computing diluted net income (loss) per share (in shares)	72,747	82,690	67,332	82,282
Product sales, net
Revenues:
Total revenues	$ 27,502,000	$ 29,435,000	$ 79,889,000	$ 100,627,000
Commercialization agreement, net
Revenues:
Total revenues	27,304,000	27,781,000	89,163,000	142,760,000
Royalties and milestones
Revenues:
Total revenues	$ 341,000	$ 20,277,000	$ 1,226,000	$ 25,784,000