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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 9 Months Ended
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Oct. 31, 2024
CASH, CASH EQUIVALENTS AND INVESTMENTS |
Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | October 31, | ​ | January 31,
​ | ​ | 2024 |  | 2024
Short-term investments | ​ | $ | 124,490 | ​ | $ | 109,489
Available-for-sale securities | ​ | ​ | 206,443 | ​ | ​ | 105,884
Total investments | ​ | $ | 330,933 | ​ | $ | 215,373
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | October 31, 2024
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 50,323 | ​ | $ | — | ​ | $ | 161 | ​ | $ | 32 | ​ | $ | 50,452
Due in one to three years | ​ | ​ | 72,751 | ​ | ​ | — | ​ | ​ | 488 | ​ | ​ | 96 | ​ | ​ | 73,143
Due in three to five years | ​ | ​ | 73,274 | ​ | ​ | — | ​ | ​ | 425 | ​ | ​ | 784 | ​ | ​ | 72,915
U.S. corporate debt security: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | ​ | 10,046 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 113 | ​ | ​ | 9,933
Totals | ​ | $ | 206,394 | ​ | $ | — | ​ | $ | 1,074 | ​ | $ | 1,025 | ​ | $ | 206,443
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | January 31, 2024
​ | ​ | ​ | ​ | ​ | Allowance for | ​ | Gross | ​ | Gross | ​ | Estimated
​ | ​ | Amortized | ​ | Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Losses |  | Gains |  | Losses |  | Value
U.S. Treasury notes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | $ | 96,217 | ​ | $ | — | ​ | $ | 568 | ​ | $ | 230 | ​ | $ | 96,555
U.S. corporate debt security: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one to three years | ​ | ​ | 9,406 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 77 | ​ | ​ | 9,329
Totals | ​ | $ | 105,623 | ​ | $ | — | ​ | $ | 568 | ​ | $ | 307 | ​ | $ | 105,884

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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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