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Stock-based Compensation - Schedule of Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total expense | $ 43,185 | $ 14,538 | $ 6,028
Capitalized to internal-use software development costs and property and equipment | (1,229) | (526) | (957)
Total stock-based compensation expense | 41,956 | 14,012 | 5,071
Cost of revenue |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total expense | 2,257 | 843 | 788
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total expense | 16,629 | 4,109 | 2,754
Sales and marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total expense | 7,877 | 1,687 | 1,234
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total expense | $ 16,422 | $ 7,899 | $ 1,252

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