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CONVERTIBLE SENIOR NOTES AND TERM LOAN - Schedule of Convertible Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025	Aug. 05, 2024
Debt Instrument [Line Items]
Principal	$ 328,914	$ 353,914
Unamortized debt discount and issuance costs	(3,125)	(3,950)
Net carrying amount	325,789	349,964
Current portion of long-term debt	19,173	11,593
Non-current portion of long-term debt	306,616	338,371
Loans payable | 2024 Term Loan
Debt Instrument [Line Items]
Principal	127,000	152,000	$ 225,000
Unamortized debt discount and issuance costs	(528)	(826)
Net carrying amount	126,472	151,174
Current portion of long-term debt	19,173	11,593
Non-current portion of long-term debt	107,299	139,581
Convertible debt | 2028 Notes
Debt Instrument [Line Items]
Principal	201,914	201,914
Unamortized debt discount and issuance costs	(2,597)	(3,124)
Net carrying amount	199,317	198,790
Current portion of long-term debt	0	0
Non-current portion of long-term debt	$ 199,317	$ 198,790

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