Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Product revenue	$ 25,783	$ 23,676	$ 74,636	$ 62,089
Licensing, milestone and contract revenue	6	5	17	16
Total revenue	25,789	23,681	74,653	62,105
Operating expenses:
Cost of product revenue	4,998	5,176	16,488	14,764
Research & development	2,822	2,061	7,773	5,971
Selling, general & administrative	4,280	3,309	12,525	10,302
Total operating expenses	12,100	10,546	36,786	31,037
Income from operations	13,689	13,135	37,867	31,068
Interest income, net	93	34	214	82
Income before income taxes	13,782	13,169	38,081	31,150
Provision for income taxes	4,830	4,789	13,619	11,435
Net income	$ 8,952	$ 8,380	$ 24,462	$ 19,715
Basic net income per share:
Net income (in dollars per share)	$ 0.61	$ 0.56	$ 1.66	$ 1.32
Basic weighted average common shares outstanding (in shares)	14,625	14,967	14,726	14,945
Diluted net income per share:
Net income (in dollars per share)	$ 0.59	$ 0.55	$ 1.61	$ 1.29
Diluted weighted average common shares outstanding (in shares)	15,077	15,316	15,163	15,311
Net income	$ 8,952	$ 8,380	$ 24,462	$ 19,715
Other comprehensive income (loss):
Unrealized gain (loss) on securities, net of tax		2		(1)
Foreign currency translation adjustment	310	258	548	(1,572)
Total other comprehensive income (loss)	310	260	548	(1,573)
Comprehensive income	$ 9,262	$ 8,640	$ 25,010	$ 18,142