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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Revenue:        
Total revenue $ 64,985 $ 41,488 $ 170,697 $ 109,478
Cost of revenue:        
Total cost of revenue 17,758 11,071 48,001 30,458
Gross profit 47,227 30,417 122,696 79,020
Operating expenses:        
Sales and marketing 38,116 28,050 109,885 77,087
Research and development 23,179 16,588 63,254 45,414
General and administrative 14,986 9,829 38,467 26,533
Total operating expenses 76,281 54,467 211,606 149,034
Loss from operations (29,054) (24,050) (88,910) (70,014)
Other income (expense):        
Interest income 2,459 227 4,936 556
Interest expense (4,358) 0 (5,652) (8)
Other income (expense), net (400) (57) (1,424) 298
Loss before provision for income taxes (31,353) (23,880) (91,050) (69,168)
Provision (benefit) for income taxes (33) 336 680 817
Net loss $ (31,320) $ (24,216) $ (91,730) $ (69,985)
Net loss per share, basic and diluted (in dollars per share) $ (0.59) $ (1.39) $ (1.78) $ (4.74)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares) 52,702,526 17,421,642 51,431,021 14,749,500
Subscription        
Revenue:        
Total revenue $ 60,090 $ 37,885 $ 157,588 $ 99,603
Cost of revenue:        
Total cost of revenue 13,248 7,904 35,434 21,669
Services        
Revenue:        
Total revenue 4,895 3,603 13,109 9,875
Cost of revenue:        
Total cost of revenue $ 4,510 $ 3,167 $ 12,567 $ 8,789