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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