CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net product sales	$ 33,945	$ 28,005	$ 96,265	$ 69,444
Operating expenses:
Cost of goods sold	1,573	513	3,351	1,424
Research and development	18,428	14,064	50,775	34,974
Selling, general and administrative	23,848	22,308	66,178	56,856
Legal fee settlement	5,212	0	5,212	0
Change in fair value of contingent consideration	(5,256)	(6,906)	(10,741)	(7,026)
Impairment of intangible assets	0	4,710	0	4,710
Total operating expenses	54,317	48,501	136,257	104,990
Operating loss	(20,372)	(20,496)	(39,992)	(35,546)
Other income (expenses), net:
Other income (expenses), net	151	(314)	156	35
Interest expense, net	(299)	(695)	(609)	(7,415)
Debt early payment penalty	0	0	0	(2,250)
Finance expense	0	0	0	(600)
Change in fair value of derivative instruments	(10,126)	29,991	(4,849)	(36,180)
Gain on sale of assets	0	140,004	0	140,004
Loss on extinguishment of debt	0	(4,151)	0	(4,151)
Litigation settlement gain	0	0	0	15,500
Bargain purchase gain	0	0	0	49,063
Total other income (loss), net	(10,274)	164,835	(5,302)	154,006
Income (loss) before provision for income taxes	(30,646)	144,339	(45,294)	118,460
Income tax benefit (expense)	(6,467)	(38,761)	5,994	1,246
Net income (loss)	$ (37,113)	$ 105,578	$ (39,300)	$ 119,706
Net earnings (loss) per common share, basic (in dollars per share)	$ (1.00)	$ 2.95	$ (1.07)	$ 3.67
Net earnings (loss) per common share, diluted (in dollars per share)	$ (1.00)	$ 1.78	$ (1.07)	$ 3.30
Weighted average common shares outstanding, basic (in shares)	36,980,356	35,741,877	36,728,911	32,650,408
Weighted average common shares outstanding, diluted (in shares)	36,980,356	42,752,859	36,728,911	36,800,536
Comprehensive income (loss):
Net income (loss)	$ (37,113)	$ 105,578	$ (39,300)	$ 119,706
Foreign currency translation	17	14	19	8
Unrealized gain (loss) on marketable securities	308	(876)	(397)	(4,395)
Comprehensive income (loss)	$ (36,788)	$ 104,716	$ (39,678)	$ 115,319