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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Total revenue $ 512,980 $ 375,612 $ 270,967
Cost of Revenue:      
Total cost of revenue 100,357 75,729 61,865
Gross profit 412,623 299,883 209,102
Operating expenses:      
Research and development 117,603 70,373 45,997
Sales and marketing 267,444 212,859 162,647
General and administrative 75,834 56,787 45,120
Total operating expenses 460,881 340,019 253,764
Loss from operations (48,258) (40,136) (44,662)
Other expense:      
Interest income 9,176 3,837 854
Interest expense (21,386) (13,181) (265)
Other expense (1,492) (559) (956)
Total other expense (13,702) (9,903) (367)
Loss before income tax (expense) benefit (61,960) (50,039) (45,029)
Income tax (expense) benefit (1,868) 10,325 (533)
Net loss $ (63,828) $ (39,714) $ (45,562)
Net loss per common share, basic and diluted $ (1.66) $ (1.08) $ (1.29)
Weighted average common shares used in computing basic and diluted net loss per common share: 38,529 36,827 35,197
Subscription [Member]      
Revenue:      
Total revenue $ 487,450 $ 356,727 $ 254,775
Cost of Revenue:      
Total cost of revenue 69,718 51,563 41,182
Professional Services and Other [Member]      
Revenue:      
Total revenue 25,530 18,885 16,192
Cost of Revenue:      
Total cost of revenue $ 30,639 $ 24,166 $ 20,683