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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 86,735 $ 70,638 $ 256,613 $ 208,225
Cost of revenue 41,244 29,292 119,058 86,254
Gross profit 45,491 41,346 137,555 121,971
Operating expenses:        
Research and development 32,528 18,271 91,862 49,224
Sales and marketing 39,288 22,568 110,494 66,416
General and administrative 28,609 23,961 97,564 56,199
Total operating expenses 100,425 64,800 299,920 171,839
Loss from operations (54,934) (23,454) (162,365) (49,868)
Interest income 280 353 730 1,450
Interest expense (1,555) (410) (3,652) (1,097)
Other income 41 69 155 418
Loss before income taxes (56,168) (23,442) (165,132) (49,097)
Income tax expense 30 336 44 1,131
Net loss $ (56,198) $ (23,778) $ (165,176) $ (50,228)
Net loss per share attributable to common stockholders, basic (in US dollar per share) $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Net loss per share attributable to common stockholders, diluted (in US dollar per share) $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Weighted-average shares used in computing net loss per share attributable to common stockholder, basic (in shares) 116,475 105,942 115,320 100,413
Weighted-average shares used in computing net loss per share attributable to common stockholder, diluted (in shares) 116,475 105,942 115,320 100,413