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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenue $ 29,547 $ 15,727 $ 50,678 $ 31,395
Cost of revenue 8,695 4,509 14,483 9,580
Gross profit 20,852 11,218 36,195 21,815
Operating expenses:        
Research and development 7,861 6,215 14,123 14,418
Sales and marketing 10,832 7,170 18,708 16,492
General and administrative 5,128 3,143 9,182 7,403
Total operating expenses 23,821 16,528 42,013 38,313
Loss from operations (2,969) (5,310) (5,818) (16,498)
Other income (expense)        
Interest and other income 21 15 34 79
Interest and other expense (92) (161) (148) (249)
Loss from operations before income taxes (3,040) (5,456) (5,932) (16,668)
Income tax provision (43) (20) (79) (45)
Net loss (3,083) (5,476) (6,011) (16,713)
Less accretion of redeemable convertible preferred stock (25) (22) (51) (45)
Net loss attributable to common stockholders $ (3,108) $ (5,498) $ (6,062) $ (16,758)
Net loss attributable to common shareholders, basic (in USD per share) $ (0.23) $ (0.42) $ (0.45) $ (1.28)
Net loss attributable to common shareholders, diluted (in USD per share) $ (0.23) $ (0.42) $ (0.45) $ (1.28)
Weighted-average shares used in computing net loss per share attributable to common shareholders, basic (in shares) 13,636 13,121 13,513 13,110
Weighted-average shares used in computing net loss per share attributable to common shareholders, diluted (in shares) 13,636 13,121 13,513 13,110