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Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue $ 14,472 $ 11,374
Cost of goods sold 4,100 3,115
Gross profit 10,372 8,259
Operating expenses    
Research and development 5,263 5,577
Selling, general and administrative 13,428 12,444
Total operating expenses 18,691 18,021
Loss from operations (8,319) (9,762)
Interest income 726 134
Interest expense (1,965) (1,830)
Other income (expense), net (817) (3)
Net loss (10,375) (11,461)
Unrealized gain (loss) on available-for-sale debt securities 0 (710)
Comprehensive loss $ (10,375) $ (12,171)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.41) $ (0.47)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.41) $ (0.47)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 25,097,262 24,307,485
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 25,097,262 24,307,485