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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Revenue $ 85,384 $ 63,592 $ 165,685 $ 122,699
Cost of revenue 13,918 9,879 27,144 18,607
Gross profit 71,466 53,713 138,541 104,092
Operating expenses:        
Sales and marketing 56,015 41,826 108,704 81,414
Research and development 21,698 17,791 43,633 34,976
General and administrative 15,987 10,541 31,123 19,596
Total operating expenses 93,700 70,158 183,460 135,986
Loss from operations (22,234) (16,445) (44,919) (31,894)
Interest income (expense), net 1,594 (23) 3,150 (49)
Other expense, net (122) (438) (336) (420)
Loss before income taxes (20,762) (16,906) (42,105) (32,363)
Provision for income taxes 866 244 963 675
Net loss (21,628) (17,150) (43,068) (33,038)
Accretion of Series A and B redeemable convertible preferred stock 0 (191) 0 (379)
Net loss attributable to common stockholders $ (21,628) $ (17,341) $ (43,068) $ (33,417)
Net loss per share attributable to common stockholders, basic and diluted (in usd per share) $ (0.23) $ (0.73) $ (0.45) $ (1.41)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares) 95,820 23,750 94,785 23,623