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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 3 Months Ended
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Apr. 30, 2024
CASH, CASH EQUIVALENTS AND INVESTMENTS |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | April 30, | ​ | January 31,
​ | ​ | 2024 |  | 2024
Short-term investments | ​ | $ | 84,029 | ​ | $ | 109,489
Available-for-sale securities | ​ | ​ | 124,589 | ​ | ​ | 105,884
Total investments | ​ | $ | 208,618 | ​ | $ | 215,373
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, 2024
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 15,032 | ​ | $ | — | ​ | $ | — | ​ | $ | 167 | ​ | $ | 14,865
Due in one to two years | ​ | ​ | 50,557 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 456 | ​ | ​ | 50,101
Due in two to three years | ​ | ​ | 50,004 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 405 | ​ | ​ | 49,599
U.S. corporate debt security: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in two to three years | ​ | ​ | 10,046 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 22 | ​ | ​ | 10,024
Totals | ​ | $ | 125,639 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,050 | ​ | $ | 124,589

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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