Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Sales	$ 17,489	$ 8,942
Cost of sales	7,123	5,181
Gross profit	10,366	3,761
Operating expenses:
Selling, general and administrative	16,255	13,620
Research and development	7,208	6,719
Total operating expenses	23,463	20,339
Loss from operations	(13,097)	(16,578)
Other income (expense), net:
Interest expense	(1,507)	(1,060)
Interest and other income	1,392	46
Loss before income taxes	(13,212)	(17,592)
Income tax expense	0	4
Net loss	(13,212)	(17,596)
Other comprehensive income (loss)
Unrealized gain (loss) on short-term investments	84	(74)
Foreign currency translation gain (loss)	2	(4)
Total other comprehensive income (loss)	86	(78)
Comprehensive loss	$ (13,126)	$ (17,674)
Net loss per share:
Basic	$ (0.42)	$ (0.64)
Diluted	$ (0.42)	$ (0.64)
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic	31,637,097	27,425,610
Attributable to common stock, diluted	31,637,097	27,425,610