CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue, Product and Service [Extensible List]			Product [Member]
Product sales, net	$ 38,326	$ 33,718	$ 111,004	$ 106,025
Other revenue	225	788	667	2,568
Total revenue	38,551	34,506	$ 111,671	108,593
Cost, Product and Service [Extensible List]			Product [Member]
Cost of product sales	13,318	12,408	$ 40,132	36,600
Gross profit	25,233	22,098	71,539	71,993
Research and development	5,046	4,284	14,698	12,363
Selling, general and administrative	26,975	22,775	79,984	71,625
Total operating expenses	32,021	27,059	94,682	83,988
Loss from operations	(6,788)	(4,961)	(23,143)	(11,995)
Other income (expense):
Interest income	342	44	578	163
Interest expense	(105)	(1)	(143)	(3)
Other income (expense)	(5)	(13)	98	44
Total other income	232	30	533	204
Loss before income taxes	(6,556)	(4,931)	(22,610)	(11,791)
Income tax expense	21	0	21	215
Net loss	$ (6,577)	$ (4,931)	$ (22,631)	$ (12,006)
Net loss per common share:
Basic (in USD per share)	$ (0.14)	$ (0.11)	$ (0.48)	$ (0.26)
Diluted (in USD per share)	$ (0.14)	$ (0.11)	$ (0.48)	$ (0.26)
Weighted-average common shares outstanding:
Basic (in shares)	47,182	46,669	47,096	46,355
Diluted (in shares)	47,182	46,669	47,096	46,355