UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Product sales	$ 29,116	$ 47,105	$ 62,277	$ 98,862
License revenue	114	(794)	246	(44)
Total revenues	29,230	46,311	62,523	98,818
Operating expenses:
Cost of products	3,512	4,561	10,104	8,463
Research and development expenses	11,890	6,792	21,841	13,998
Selling, general and administrative expenses	27,843	12,429	52,330	24,241
Intangible asset amortization	1,609	564	3,376	1,128
Gain - changes in fair value of related party contingent consideration	(12,889)	(13,230)	(9,921)	(20,201)
Restructuring costs	50	1,069	203	3,722
Total operating expenses	32,015	12,185	77,933	31,351
Operating (loss) income	(2,785)	34,126	(15,410)	67,467
Investment and other income (expense), net	583	764	637	1,585
Interest expense, net	(2,980)	(263)	(4,577)	(526)
Other income - changes in fair value of related party payable	1,402	1,670	1,007	2,220
(Loss) income before income taxes	(3,780)	36,297	(18,343)	70,746
Income tax (benefit) provision	(342)	7,370	(2,669)	15,909
Net (loss) income	$ (3,438)	$ 28,927	$ (15,674)	$ 54,837
Net income (loss) per share - basic (in dollars per share)	$ (0.09)	$ 0.70	$ (0.42)	$ 1.33
Net income (loss) per share - diluted (in dollars per share)	$ (0.09)	$ 0.68	$ (0.42)	$ 1.29
Weighted average number of shares outstanding - basic (in shares)	36,772	41,091	37,666	41,233
Weighted average number of shares outstanding - diluted (in shares)	36,772	42,487	37,666	42,625