Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 18,124	$ 14,472
Cost of goods sold	4,781	4,100
Gross profit	13,343	10,372
Operating expenses
Research and development	5,784	5,263
Selling, general and administrative	15,104	13,428
Total operating expenses	20,888	18,691
Loss from operations	(7,545)	(8,319)
Interest income	827	726
Interest expense	(2,258)	(1,965)
Other income (expense), net	51	(817)
Net loss	(8,925)	(10,375)
Comprehensive loss	$ (8,925)	$ (10,375)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.32)	$ (0.41)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.32)	$ (0.41)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	28,285,176	25,097,262
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	28,285,176	25,097,262