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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 20,402 | $ 17,230 | $ 35,000 | $ 34,602
Unrecognized compensation cost, stock options | 162,800 |  | 162,800 |
Stock-based compensation related to internal-use software development | 300 | 500 | 1,000 | 800
Cost of revenue |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 2,312 | 1,307 | 3,757 | 2,540
Sales and marketing |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 7,377 | 7,960 | 12,878 | 15,741
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 5,828 | 3,933 | 9,816 | 7,876
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 4,885 | $ 4,030 | $ 8,549 | $ 8,445
Options to purchase common stock |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Unrecognized compensation cost, period for recognition (in years) |  |  | 2 years 9 months 10 days |

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