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Income Taxes - Schedule of Reconciliation of The Federal Statutory Income Tax Rate And The Provision For Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Tax benefit at federal statutory rate | $ (8,867) | $ (30,017) | $ (27,975) |
State taxes, net of federal benefit | 6,798 | (3,122) | (2,672) |
Foreign rate difference | 1,676 | (305) | 1,798 |
Nondeductible expenses | 675 | 2,313 | 535 |
Research and development credit | (6,487) | (6,670) | (5,536) |
Stock-based compensation | 4,942 | 6,325 | (6,541) |
Change in reserve for unrecognized tax benefits | 6,487 | 6,670 | 5,507 |
Change in valuation allowance, including the effect of tax rate change | 2,301 | 26,462 | 35,061 |
Effect of tax rate change on deferred tax assets | (6,524) |  | 1,028 |
Other | 206 | (246) | 193 |
Provision for income taxes | $ 1,207 | $ 1,410 | $ 1,398 | [1]
[1] | As reported and disclosed under ASC Topic 840

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