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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 6 Months Ended
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Jul. 31, 2023
CASH, CASH EQUIVALENTS AND INVESTMENTS |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | July 31, | ​ | January 31,
​ | ​ | 2023 |  | 2023
Short-term investments | ​ | $ | 81,624 | ​ | $ | 151,511
Available-for-sale securities | ​ | ​ | 59,992 | ​ | ​ | —
Total investments | ​ | $ | 141,616 | ​ | $ | 151,511
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | July 31, 2023
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to two years | ​ | $ | 25,162 | ​ | $ | — | ​ | $ | — | ​ | $ | 276 | ​ | $ | 24,886
Due in two to three years | ​ | ​ | 35,550 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 444 | ​ | ​ | 35,106
Totals | ​ | $ | 60,712 | ​ | $ | — | ​ | $ | — | ​ | $ | 720 | ​ | $ | 59,992

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