NET LOSS PER SHARE - Schedule of Computations of Diluted Weighted-Average Shares Outstanding (Details) - shares	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options to purchase common stock (in shares)	50,764,699	85,375,757
Stock options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options to purchase common stock (in shares)	21,207,427	17,613,352
Common stock issuable upon exercise of Series A Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options to purchase common stock (in shares)	0	38,481,325
Common stock issuable upon exercise of Series B Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options to purchase common stock (in shares)	28,861,000	28,861,000
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options to purchase common stock (in shares)	696,272	420,080