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v3.21.2

Fair Value Measurements (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jan. 31, 2021
Short-term investments: |  |
Short-term investments | $ 370,000 | $ 364,000
Total assets measured and recorded at fair value | 40,890,000 | 40,882,000
Debt securities, available-for-sale, unrealized gain (loss) | 0 | 0
Level 1 |  |
Short-term investments: |  |
Total assets measured and recorded at fair value | 40,520,000 | 40,518,000
Level 2 |  |
Short-term investments: |  |
Total assets measured and recorded at fair value | 370,000 | 364,000
Level 3 |  |
Short-term investments: |  |
Total assets measured and recorded at fair value | 0 | 0
Certificates of deposit |  |
Short-term investments: |  |
Short-term investments | 370,000 | 364,000
Certificates of deposit | Level 1 |  |
Short-term investments: |  |
Short-term investments | 0 | 0
Certificates of deposit | Level 2 |  |
Short-term investments: |  |
Short-term investments | 370,000 | 364,000
Certificates of deposit | Level 3 |  |
Short-term investments: |  |
Short-term investments | 0 | 0
Money market funds |  |
Cash equivalents: |  |
Money market funds | 40,520,000 | 40,518,000
Money market funds | Level 1 |  |
Cash equivalents: |  |
Money market funds | 40,520,000 | 40,518,000
Money market funds | Level 2 |  |
Cash equivalents: |  |
Money market funds | 0 | 0
Money market funds | Level 3 |  |
Cash equivalents: |  |
Money market funds | $ 0 | $ 0

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