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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenue $ 253,354 $ 202,552 $ 164,445
Cost of revenue 81,458 65,443 62,578
Gross profit 171,896 137,109 101,867
Operating expenses:      
Research and development 55,488 45,604 37,902
Sales and marketing 72,963 53,044 37,437
General and administrative 49,336 37,334 35,446
Provision for transaction losses 5,821 4,250 5,550
Total operating expenses 183,608 140,232 116,335
Loss from operations (11,712) (3,123) (14,468)
Interest expense 2,038 960 858
Other expense, net 6,142 62 908
Total loss before income taxes (19,892) (4,145) (16,234)
Income tax benefit (provision) (15) 22 1
Net loss (19,907) (4,123) (16,233)
Premium paid on repurchase of redeemable convertible preferred stock 0 (6,506) 0
Net loss attributable to common stockholders $ (19,907) $ (10,629) $ (16,233)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.38) $ (0.32) $ (0.51)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted 52,327,518 32,944,714 32,071,604