Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Product revenue	$ 27,178	$ 25,783	$ 78,899	$ 74,636
Licensing, milestone and contract revenue	6	6	5,133	17
Total revenue	27,184	25,789	84,032	74,653
Operating expenses:
Cost of product revenue	6,250	4,998	18,648	16,488
Research and development	5,842	2,822	14,521	7,773
Selling, general and administrative	4,823	4,280	14,862	12,525
Total operating expenses	16,915	12,100	48,031	36,786
Income from operations	10,269	13,689	36,001	37,867
Interest income, net	261	93	335	214
Income before income taxes	10,530	13,782	36,336	38,081
Provision for income taxes	3,643	4,830	12,587	13,619
Net income	$ 6,887	$ 8,952	$ 23,749	$ 24,462
Basic net income per share:
Net income (in dollars per share)	$ 0.47	$ 0.61	$ 1.63	$ 1.66
Basic weighted average common shares outstanding (in shares)	14,579	14,625	14,572	14,726
Diluted net income per share:
Net income (in dollars per share)	$ 0.46	$ 0.59	$ 1.58	$ 1.61
Diluted weighted average common shares outstanding (in shares)	15,115	15,077	15,065	15,163
Net income	$ 6,887	$ 8,952	$ 23,749	$ 24,462
Other comprehensive income:
Foreign currency translation adjustment	690	310	2,270	548
Comprehensive income	$ 7,577	$ 9,262	$ 26,019	$ 25,010