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Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Revenue $ 16,427 $ 11,157 $ 47,409 $ 32,731
Cost of goods sold 4,194 3,192 12,832 9,041
Gross profit 12,233 7,965 34,577 23,690
Operating expenses        
Research and development 4,795 5,611 15,401 16,857
Selling, general and administrative 13,388 12,553 41,299 37,768
Total operating expenses 18,183 18,164 56,700 54,625
Loss from operations (5,950) (10,199) (22,123) (30,935)
Interest income 769 423 2,228 778
Interest expense (2,191) (1,906) (6,281) (5,588)
Other income (expense), net 115 (103) (580) (191)
Net loss (7,257) (11,785) (26,756) (35,936)
Unrealized loss on available-for-sale debt securities 0 117 0 (1,062)
Comprehensive loss $ (7,257) $ (11,668) $ (26,756) $ (36,998)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.28) $ (0.48) $ (1.05) $ (1.47)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.28) $ (0.48) $ (1.05) $ (1.47)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 26,017,329 24,728,701 25,532,415 24,514,820
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 26,017,329 24,728,701 25,532,415 24,514,820