CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Revenue	$ 47,731	$ 32,455	$ 92,561	$ 63,045
Operating expenses:
Cost of product revenue	21,088	13,937	40,756	27,926
Research and development	5,780	1,860	9,068	3,602
Selling, general and administrative	16,590	11,185	32,488	20,367
Total operating expenses	43,458	26,982	82,312	51,895
Income from operations	4,273	5,473	10,249	11,150
Investment income	512	110	693	206
Interest expense	(1,669)	(1,601)	(3,321)	(3,187)
Other income (expense)	251	(328)	321	(448)
Income before income taxes	3,367	3,654	7,942	7,721
Income tax (benefit) provision	629	(4,784)	1,757	(3,785)
Net income	$ 2,738	$ 8,438	$ 6,185	$ 11,506
Earnings per share:
Basic	$ 0.06	$ 0.25	$ 0.14	$ 0.34
Diluted	$ 0.06	$ 0.24	$ 0.14	$ 0.33
Weighted average shares outstanding:
Basic	43,743,356	34,097,805	43,682,650	33,995,323
Diluted	45,015,720	35,094,814	44,694,745	34,715,797
Other comprehensive income:
Unrealized gain on investments				$ 5
Foreign currency translation (loss) gain	$ (5,031)	$ 4,046	$ (4,780)	5,073
Comprehensive (loss) income	(2,293)	12,484	1,405	16,584
Product Revenue
Revenue:
Revenue	47,743	32,434	92,542	63,003
Royalty and Other Revenue
Revenue:
Revenue	$ (12)	$ 21	$ 19	$ 42