CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Revenue	$ 70,692	$ 47,731	$ 131,326	$ 92,561
Costs and operating expenses:
Cost of product revenue	30,708	21,088	57,553	40,756
Research and development	5,231	5,780	8,851	9,068
Selling, general and administrative	23,699	16,590	42,697	32,488
Total costs and operating expenses	59,638	43,458	109,101	82,312
Income from operations	11,054	4,273	22,225	10,249
Other income (expenses):
Investment income	1,005	512	1,718	693
Interest expense	(1,743)	(1,669)	(3,469)	(3,321)
Other (expenses) income	(697)	251	(339)	321
Other expenses, net	(1,435)	(906)	(2,090)	(2,307)
Income before income taxes	9,619	3,367	20,135	7,942
Income tax provision	1,524	629	3,987	1,757
Net income	$ 8,095	$ 2,738	$ 16,148	$ 6,185
Earnings per share:
Basic	$ 0.17	$ 0.06	$ 0.36	$ 0.14
Diluted	$ 0.17	$ 0.06	$ 0.34	$ 0.14
Weighted average common shares outstanding:
Basic	46,367	43,743	45,174	43,683
Diluted	49,056	45,016	47,692	44,695
Net income	$ 8,095	$ 2,738	$ 16,148	$ 6,185
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,269)	(5,031)	(3,160)	(4,780)
Comprehensive income (loss)	6,826	(2,293)	12,988	1,405
Products
Revenue:
Revenue	70,670	47,743	131,282	92,542
Royalty and Other Revenue
Revenue:
Revenue	$ 22	$ (12)	$ 44	$ 19