CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Net product sales	$ 62,207	$ 59,060	$ 120,207	$ 106,773
Total revenues	62,207	59,060	120,207	106,773
Operating expenses:
Cost of goods sold excluding amortization	5,847	6,368	11,054	11,481
Research and development	12,903	10,950	28,430	24,228
Selling, general and administrative	33,917	31,468	70,938	62,497
Intangible asset amortization	369	379	739	759
Total operating expenses	53,036	49,165	111,161	98,965
Income from operations	9,171	9,895	9,046	7,808
Other income	1,918	1,649	3,284	3,134
Income before income taxes	11,089	11,544	12,330	10,942
Provision for income taxes	2,375	18	3,130	28
Net income	$ 8,714	$ 11,526	$ 9,200	$ 10,914
Net income per share:
Basic (in dollars per share)	$ 0.16	$ 0.22	$ 0.17	$ 0.21
Diluted (in dollars per share)	$ 0.16	$ 0.21	$ 0.17	$ 0.20
Weighted average shares outstanding:
Basic (in shares)	54,501,308	53,101,499	54,153,812	52,928,101
Diluted (in shares)	55,081,397	54,579,982	54,975,771	54,932,932