UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Product sales	$ 33,161	$ 51,757
License revenue	132	750
Total revenues	33,293	52,507
Operating expenses:
Cost of products	6,592	3,902
Research and development expenses	9,951	7,206
Selling, general and administrative expenses	24,487	11,812
Intangible asset amortization	1,767	564
Loss (gain) - changes in fair value of related party contingent consideration	2,968	(6,971)
Restructuring costs	153	2,653
Total operating expenses	45,918	19,166
Operating (loss) income	(12,625)	33,341
Investment income and other income (expense), net	54	821
Interest expense, net	(1,597)	(263)
Other (expense) income - changes in fair value of related party payable	(395)	550
(Loss) income before income taxes	(14,563)	34,449
Income tax (benefit) provision	(2,327)	8,539
Net (loss) income	$ (12,236)	$ 25,910
Net income (loss) per share - basic (in dollars per share)	$ (0.32)	$ 0.63
Net income (loss) per share - diluted (in dollars per share)	$ (0.32)	$ 0.61
Weighted average number of shares outstanding - basic (in shares)	38,559	41,374
Weighted average number of shares outstanding - diluted (in shares)	38,559	42,810