CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 11,565	$ 9,013	$ 20,859	$ 16,336
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	1,734	1,929	3,511	3,319
Research and development	12,992	5,605	22,937	11,084
Sales and marketing	6,883	6,659	13,576	12,318
General and administrative	8,557	5,184	17,106	10,299
Amortization of acquired intangible assets	615	615	1,230	1,230
Total operating expenses	30,781	19,992	58,360	38,250
Loss from operations	(19,216)	(10,979)	(37,501)	(21,914)
Other income (expense):
Interest and other income, net	362	280	423	281
Interest expense	(552)	(1,376)	(1,745)	(2,722)
Gain (loss) on extinguishment of debt	0	2,065	(1,559)	2,065
Total other income (expense), net	(190)	969	(2,881)	(376)
Net loss	$ (19,406)	$ (10,010)	$ (40,382)	$ (22,290)
Net loss per share - basic	$ (0.52)	$ (0.35)	$ (1.08)	$ (0.83)
Net loss per share - diluted	$ (0.52)	$ (0.35)	$ (1.08)	$ (0.83)
Weighted average shares outstanding - basic	37,322	28,744	37,288	26,750
Weighted average shares outstanding - diluted	37,322	28,744	37,288	26,750
Net loss	$ (19,406)	$ (10,010)	$ (40,382)	$ (22,290)
Other comprehensive loss:
Unrealized loss on available-for-sale securities, net of tax of $0 for periods presented	(186)	0	(239)	0
Comprehensive loss	(19,592)	(10,010)	(40,621)	(22,290)
Product [Member]
Revenues:
Total revenues	11,318	8,738	20,328	15,540
License and Collaboration Agreements [Member]
Revenues:
Total revenues	49	94	108	435
Royalty Income [Member]
Revenues:
Total revenues	$ 198	$ 181	$ 423	$ 361