CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 49,529	$ 36,580	$ 142,090	$ 99,624
Operating expenses:
Cost of product revenue	22,183	19,987	62,939	47,913
Research and development	3,601	2,001	12,669	5,603
Selling, general and administrative	15,859	14,998	48,347	35,365
Total operating expenses	41,643	36,986	123,955	88,881
Income (loss) from operations	7,886	(406)	18,135	10,743
Other income (expenses):
Investment income	558	102	1,251	308
Interest expense	(1,687)	(1,618)	(5,008)	(4,804)
Other (expenses) income	(134)	(100)	187	(548)
Total other expenses, net	(1,263)	(1,616)	(3,570)	(5,044)
Income (loss) before income taxes	6,623	(2,022)	14,565	5,699
Income tax provision (benefit)	1,829	(6,691)	3,586	(10,476)
Net income	$ 4,794	$ 4,669	$ 10,979	$ 16,175
Earnings per share:
Basic	$ 0.11	$ 0.11	$ 0.25	$ 0.44
Diluted	$ 0.10	$ 0.11	$ 0.24	$ 0.43
Weighted average shares outstanding:
Basic	43,822,472	41,236,554	43,728,503	36,435,591
Diluted	45,828,175	42,563,002	45,132,115	37,386,333
Other comprehensive income:
Unrealized gain on investments				$ 5
Foreign currency translation (loss) gain	$ (630)	$ 2,025	$ (5,410)	7,097
Comprehensive income	4,164	6,694	5,569	23,277
Product Revenue
Revenue:
Revenue	49,500	36,514	142,042	99,516
Royalty and Other Revenue
Revenue:
Revenue	$ 29	$ 66	$ 48	$ 108