Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Total revenues:	$ 41,092	$ 39,443	$ 123,549	$ 114,304
Cost of sales	6,365	5,376	16,470	16,371
Expenses:
Selling, general and administrative	25,468	22,461	79,007	77,408
Total expenses:	25,468	22,461	79,007	77,408
Income from operations	9,259	11,606	28,072	20,525
Interest expense, net	(1,984)	(2,010)	(5,962)	(4,997)
Other (expense)/income, net	0	(2)	(1)	6
Income before income taxes	7,275	9,594	22,109	15,534
Income tax provision	(606)	(211)	(1,139)	(19)
Net income attributable to common stockholders	$ 6,669	$ 9,383	$ 20,970	$ 15,515
Basic and diluted:
Weighted average common stock shares outstanding, basic (in shares)	98,699,857	101,031,317	99,485,399	99,377,748
Basic earnings per share (in usd per share)	$ 0.07	$ 0.09	$ 0.21	$ 0.16
Weighted average common stock shares outstanding, diluted (in shares)	102,430,883	105,783,568	103,473,967	104,836,493
Diluted earnings per share (in usd per share)	$ 0.07	$ 0.09	$ 0.20	$ 0.15
Product sales, net
Revenues:
Total revenues:	$ 41,072	$ 38,785	$ 122,398	$ 112,946
Product royalty revenues
Revenues:
Total revenues:	$ 20	$ 658	$ 1,151	$ 1,358