CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Net product sales	$ 60,308	$ 59,485	$ 180,515	$ 166,258
Total revenues	60,308	59,485	180,515	166,258
Operating expenses:
Cost of goods sold excluding amortization	5,898	6,782	16,952	18,263
Research and development	12,298	11,347	40,728	35,575
Selling, general and administrative	34,001	30,221	104,939	92,718
Intangible asset amortization	369	376	1,108	1,135
Total operating expenses	52,566	48,726	163,727	147,691
Income from operations	7,742	10,759	16,788	18,567
Other income	659	1,517	3,943	4,651
Income before income taxes	8,401	12,276	20,731	23,218
Provision (benefit) for income taxes	2,454	(88,147)	5,584	(88,119)
Net income	$ 5,947	$ 100,423	$ 15,147	$ 111,337
Net income per share:
Basic (in dollars per share)	$ 0.11	$ 1.88	$ 0.28	$ 2.10
Diluted (in dollars per share)	$ 0.11	$ 1.84	$ 0.28	$ 2.03
Weighted average shares outstanding:
Basic (in shares)	54,666,128	53,297,298	54,325,832	53,052,521
Diluted (in shares)	55,209,032	54,541,625	55,054,772	54,803,851