Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Statements of Operations and Comprehensive Loss [Abstract]
Revenue	$ 33,173	$ 26,456	$ 61,193	$ 48,509
Cost of goods sold	9,012	6,598	17,588	12,137
Gross profit	24,161	19,858	43,605	36,372
Operating expenses:
Research and development	10,655	7,261	18,778	12,744
Selling, general and administrative	27,700	22,549	54,975	43,743
Total operating expenses	38,355	29,810	73,753	56,487
Loss from operations	(14,194)	(9,952)	(30,148)	(20,115)
Interest income	122	47	134	142
Interest expense	(1,031)	(628)	(1,652)	(1,250)
Loss on debt extinguishment	(245)		(245)
Other income (expense), net	(50)	(6)	(166)	(10)
Net loss	(15,398)	(10,539)	(32,077)	(21,233)
Other comprehensive loss:
Change in unrealized gain (loss) on investments, net	(2)	(3)	(2)	(36)
Net change in other comprehensive loss	(2)	(3)	(2)	(36)
Net loss and comprehensive loss	$ (15,400)	$ (10,542)	$ (32,079)	$ (21,269)
Net loss per share, basic	$ (0.44)	$ (0.31)	$ (0.91)	$ (0.62)
Net loss per share, diluted	$ (0.44)	$ (0.31)	$ (0.91)	$ (0.62)
Weighted average common shares used to compute net loss per share, basic and diluted	35,143,178	34,534,099	35,083,569	34,435,812