CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Total revenues	$ 10,012	$ 9,059	$ 30,871	$ 25,395
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	1,405	1,825	4,916	5,144
Research and development	11,162	8,498	34,099	19,582
Sales and marketing	6,016	7,374	19,592	19,692
General and administrative	9,212	6,060	26,321	16,358
Amortization of acquired intangible assets	615	615	1,845	1,845
Total operating expenses	28,410	24,372	86,773	62,621
Loss from operations	(18,398)	(15,313)	(55,902)	(37,226)
Other income (expense):
Interest and other income, net	640	6	1,067	286
Interest expense	(662)	(1,388)	(2,408)	(4,110)
Gain (loss) on extinguishment of debt	0	0	(1,559)	2,065
Total other expense, net	(22)	(1,382)	(2,900)	(1,759)
Net loss	$ (18,420)	$ (16,695)	$ (58,802)	$ (38,985)
Net loss per share - basic	$ (0.49)	$ (0.58)	$ (1.58)	$ (1.42)
Net loss per share - diluted	$ (0.49)	$ (0.58)	$ (1.58)	$ (1.42)
Weighted average shares outstanding - basic	37,338	28,766	37,305	27,429
Weighted average shares outstanding - diluted	37,338	28,766	37,305	27,429
Net loss	$ (18,420)	$ (16,695)	$ (58,802)	$ (38,985)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities, net of tax of $0 for periods presented	51	0	(188)	0
Comprehensive loss	(18,369)	(16,695)	(58,990)	(38,985)
Product [Member]
Revenues:
Total revenues	9,720	8,587	30,048	24,127
License and Collaboration Agreements [Member]
Revenues:
Total revenues	52	159	160	594
Royalty Income [Member]
Revenues:
Total revenues	$ 240	$ 313	$ 663	$ 674