Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Total revenues:	$ 41,439	$ 36,582	$ 82,458	$ 74,861
Cost of sales	4,284	5,435	10,105	10,995
Expenses:
Selling, general and administrative	25,779	28,211	53,540	54,948
Total expenses:	25,779	28,211	53,540	54,948
Income from operations	11,376	2,936	18,813	8,918
Interest expense, net	(1,999)	(1,693)	(3,977)	(2,987)
Other (expense)/income, net	(1)	8	(1)	8
Income before income taxes	9,376	1,251	14,835	5,939
Income tax (provision)/recovery	(312)	(86)	(534)	192
Net income attributable to common stockholders	$ 9,064	$ 1,165	$ 14,301	$ 6,131
Basic and diluted:
Weighted average common stock shares outstanding, basic (in shares)	98,793,242	100,136,893	99,884,680	98,541,877
Basic earnings per share (in usd per share)	$ 0.09	$ 0.01	$ 0.14	$ 0.06
Weighted average common stock shares outstanding, diluted (in shares)	102,508,512	108,111,201	104,009,410	107,062,161
Diluted earnings per share (in usd per share)	$ 0.09	$ 0.01	$ 0.14	$ 0.06
Product sales, net
Revenues:
Total revenues:	$ 40,523	$ 36,445	$ 81,326	$ 74,161
Product royalty revenues
Revenues:
Total revenues:	$ 916	$ 137	$ 1,132	$ 700