CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue	$ 87,462	$ 70,692	$ 163,552	$ 131,326
Costs and operating expenses:
Cost of product revenue	36,863	30,708	68,845	57,553
Research and development	4,336	5,231	9,038	8,851
Selling, general and administrative	26,726	23,699	54,226	42,697
Total costs and operating expenses	67,925	59,638	132,109	109,101
Income from operations	19,537	11,054	31,443	22,225
Other income (expenses):
Investment income	253	1,005	1,617	1,718
Interest expense	(3,004)	(1,743)	(5,980)	(3,469)
Other expenses	(766)	(697)	(384)	(339)
Other expenses, net	(3,517)	(1,435)	(4,747)	(2,090)
Income before income taxes	16,020	9,619	26,696	20,135
Income tax provision	159	1,524	1,020	3,987
Net income	$ 15,861	$ 8,095	$ 25,676	$ 16,148
Earnings per share:
Basic	$ 0.30	$ 0.17	$ 0.49	$ 0.36
Diluted	$ 0.30	$ 0.17	$ 0.48	$ 0.34
Weighted average common shares outstanding:
Basic	52,381	46,367	52,260	45,174
Diluted	53,306	49,056	53,213	47,692
Net income	$ 15,861	$ 8,095	$ 25,676	$ 16,148
Other comprehensive income (loss):
Foreign currency translation adjustment	6,493	(1,269)	914	(3,160)
Comprehensive income	22,354	6,826	26,590	12,988
Products
Revenue:
Revenue	87,432	70,670	163,492	131,282
Royalty and Other Revenue
Revenue:
Revenue	$ 30	$ 22	$ 60	$ 44