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CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2023 USD ($) | Oct. 31, 2023 USD ($)
Cash and Cash Equivalents |  |
Interest receivable | $ 800 | $ 800
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Current, Statement of Financial Position [Extensible Enumeration] | Investments | Investments
Net unrealized holding losses for the Company's AFS securities | $ 400 | $ 1,100
Proceeds from sale of debt securities, available-for-sale | 0 | 0
Amounts of gains or losses reclassified out of other comprehensive income | 0 | 0
Available-for-sale securities |  |
Amortized Cost | 105,064 | 105,064
Gross Unrealized Gains | 3 | 3
Gross Unrealized Losses | 1,150 | 1,150
Fair Value | 103,917 | 103,917
US Treasury notes |  |
Available-for-sale securities |  |
Amortized cost, Due in one to two years | 50,282 | 50,282
Amortized Cost, Due in two to three years | 45,514 | 45,514
Gross Unrealized Gains, Due in one to two years | 3 | 3
Gross Unrealized Losses, Due in one to two years | 357 | 357
Gross Unrealized Losses, Due in two to three years | 742 | 742
Fair value, Due in one to two years | 49,928 | 49,928
Fair Value, Due in two to three years | 44,772 | 44,772
U.S. corporate debt security |  |
Available-for-sale securities |  |
Amortized Cost, Due in two to three years | 9,268 | 9,268
Gross Unrealized Losses, Due in two to three years | 51 | 51
Fair Value, Due in two to three years | $ 9,217 | $ 9,217
Minimum |  |
Cash and Cash Equivalents |  |
Available-for-sale securities term | 2 years | 2 years
Maximum |  |
Cash and Cash Equivalents |  |
Available-for-sale securities term | 3 years | 3 years

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