CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net product sales	$ 33,311	$ 24,068	$ 62,319	$ 41,440
Operating expenses:
Cost of goods sold	1,021	637	1,778	912
Research and development	17,675	10,563	32,347	20,910
Selling, general and administrative	23,205	19,692	42,330	34,547
Change in valuation of contingent consideration	(2,789)	(120)	(5,485)	(120)
Total operating expenses	44,690	31,012	81,940	56,489
Operating loss	(11,379)	(6,944)	(19,621)	(15,049)
Other income (expenses), net:
Other income (expenses), net	(206)	522	4	349
Interest expense, net	(147)	(2,922)	(309)	(6,720)
Finance expense	0	0	0	(600)
Change in fair value of derivative instruments	(9,063)	(29,418)	5,277	(66,171)
Loss on extinguishment of debt	0	(2,250)	0	(2,250)
Litigation settlement gain	0	15,500	0	15,500
Bargain purchase gain	0	0	0	49,063
Total other income (loss), net	(9,416)	(18,568)	4,972	(10,829)
Loss before provision for income taxes	(20,795)	(25,512)	(14,649)	(25,878)
Income tax benefit (expense)	7,392	(15)	12,462	40,006
Net income (loss)	$ (13,403)	$ (25,527)	$ (2,187)	$ 14,128
Net earnings (loss) per common share, basic (in dollars per share)	$ (0.37)	$ (0.73)	$ (0.06)	$ 0.45
Net earnings (loss) per common share, diluted (in dollars per share)	$ (0.37)	$ (0.73)	$ (0.20)	$ 0.44
Weighted average common shares outstanding, basic (in shares)	36,683,429	34,957,134	36,601,807	31,079,053
Weighted average common shares outstanding, diluted (in shares)	36,683,429	34,957,134	38,063,285	34,827,405
Comprehensive income (loss):
Net income (loss)	$ (13,403)	$ (25,527)	$ (2,187)	$ 14,128
Foreign currency translation	71	(30)	2	(7)
Unrealized loss on marketable securities	(157)	(298)	(706)	(3,519)
Comprehensive income (loss)	$ (13,489)	$ (25,855)	$ (2,891)	$ 10,602