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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]    
Revenue $ 53,662 $ 48,416
Cost of goods sold 13,797 12,786
Gross profit 39,865 35,630
Operating expenses    
Research and development 15,397 13,063
Selling, general and administrative 83,105 69,871
Total operating expenses 98,502 82,934
Loss from operations (58,637) (47,304)
Interest income 1,529 400
Interest expense (1,066) (829)
Other income (expense), net (396) (585)
Net loss before tax (58,570) (48,318)
Income tax expense 353 343
Net loss (58,923) (48,661)
Other comprehensive income (loss)    
Currency translation adjustment 150 51
Change in unrealized losses on marketable securities (287) (24)
Total other comprehensive income (loss) (137) 27
Comprehensive loss $ (59,060) $ (48,634)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (1.59) $ (1.35)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (1.59) $ (1.35)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 37,096,541 36,129,409
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 37,096,541 36,129,409