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CONVERTIBLE SENIOR NOTES AND TERM LOAN - Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]        
Amortization of debt discount and issuance costs     $ 2,240 $ 2,000
Convertible Senior Notes 2024 | Convertible debt        
Debt Instrument [Line Items]        
Contractual interest expense $ 80 $ 350 159 975
Amortization of debt discount and issuance costs 109 633 216 1,464
Total interest expense 189 983 375 2,439
Term Loan | Loans payable        
Debt Instrument [Line Items]        
Contractual interest expense 6,592 3,209 13,471 3,209
Amortization of debt discount and issuance costs 768 434 1,542 434
Total interest expense 7,360 3,643 15,013 3,643
2028 Notes | Convertible debt        
Debt Instrument [Line Items]        
Contractual interest expense 2,036 1,106 4,050 1,106
Amortization of debt discount and issuance costs 255 102 482 102
Total interest expense $ 2,291 $ 1,208 $ 4,532 $ 1,208