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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenue $ 11,157 $ 10,339 $ 32,731 $ 34,186
Cost of goods sold 3,192 2,832 9,041 8,827
Gross profit 7,965 7,507 23,690 25,359
Operating expenses        
Research and development 5,611 4,329 16,857 12,866
Selling, general and administrative 12,553 9,421 37,768 27,215
Total operating expenses 18,164 13,750 54,625 40,081
Loss from operations (10,199) (6,243) (30,935) (14,722)
Interest income 423 136 778 262
Interest expense (1,906) (1,826) (5,588) (5,548)
Other income (expense), net (103) (150) (191) (5,379)
Net loss (11,785) (8,083) (35,936) (25,387)
Unrealized gain (loss) on available-for-sale debt securities 117 22 (1,062) 0
Comprehensive loss $ (11,668) $ (8,061) $ (36,998) $ (25,387)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.48) $ (0.34) $ (1.47) $ (1.81)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.48) $ (0.34) $ (1.47) $ (1.81)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 24,728,701 24,101,399 24,514,820 14,061,958
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 24,728,701 24,101,399 24,514,820 14,061,958