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Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Revenue $ 16,510 $ 10,200 $ 30,982 $ 21,574
Cost of goods sold 4,538 2,734 8,638 5,849
Gross profit 11,972 7,466 22,344 15,725
Operating expenses        
Research and development 5,343 5,669 10,606 11,246
Selling, general and administrative 14,483 12,771 27,911 25,215
Total operating expenses 19,826 18,440 38,517 36,461
Loss from operations (7,854) (10,974) (16,173) (20,736)
Interest income 733 221 1,459 355
Interest expense (2,125) (1,852) (4,090) (3,682)
Other income (expense), net 122 (85) (695) (88)
Net loss (9,124) (12,690) (19,499) (24,151)
Unrealized loss on available-for-sale debt securities 0 (469) 0 (1,179)
Comprehensive loss $ (9,124) $ (13,159) $ (19,499) $ (25,330)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.36) $ (0.52) $ (0.77) $ (0.99)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.36) $ (0.52) $ (0.77) $ (0.99)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 25,472,526 24,503,552 25,285,933 24,406,100
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 25,472,526 24,503,552 25,285,933 24,406,100