CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Total revenues	$ 9,059	$ 15,695	$ 25,395	$ 27,306
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	1,825	1,882	5,144	3,363
Research and development	8,498	4,090	19,582	12,219
Sales and marketing	7,374	5,269	19,692	19,483
General and administrative	6,060	5,796	16,358	14,949
Amortization of acquired intangible assets	615	615	1,845	1,845
Total operating expenses	24,372	17,652	62,621	51,859
Loss from operations	(15,313)	(1,957)	(37,226)	(24,553)
Other income (expense):
Interest and other income, net	6	(4)	286	58
Interest expense	(1,388)	(1,840)	(4,110)	(5,430)
Gain on extinguishment of debt		0	2,065	0
Total other (expense) income, net	(1,382)	(1,844)	(1,759)	(5,372)
Net loss	$ (16,695)	$ (3,801)	$ (38,985)	$ (29,925)
Net loss per share - basic and diluted	$ (0.58)	$ (0.30)	$ (1.42)	$ (2.44)
Weighted average shares outstanding - basic and diluted	28,766	12,794	27,429	12,277
Net loss	$ (16,695)	$ (3,801)	$ (38,985)	$ (29,925)
Comprehensive loss	(16,695)	(3,801)	(38,985)	(29,925)
Product [Member]
Revenues:
Total revenues	8,587	5,758	24,127	14,151
License and Collaboration Agreement [Member]
Revenues:
Total revenues	159	9,535	594	11,590
Royalty Income [Member]
Revenues:
Total revenues	$ 313	$ 402	$ 674	$ 1,565