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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY - Schedule of Restricted Stock Unit and Performance Stock Unit Activity (Details) - $ / shares
shares in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
RSU    
Number of Shares    
Beginning balance (in shares) 10,229  
Granted (in shares) 7,062  
Vested and released (in shares) (4,247)  
Forfeited (in shares) (820)  
Ending balance (in shares) 12,224 10,229
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 2.67  
Granted (in dollars per share) 1.84  
Vested and released (in dollars per share) 2.79  
Forfeited (in dollars per share) 2.52  
Ending balance (in dollars per share) $ 2.16 $ 2.67
Weighted average remaining contractual term (in years) 1 year 2 months 1 day 11 months 8 days
Performance stock units    
Number of Shares    
Beginning balance (in shares) 3,880  
Granted (in shares) 1,295  
Vested and released (in shares) (676)  
Forfeited (in shares) (392)  
Ending balance (in shares) 4,107 3,880
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 2.88  
Granted (in dollars per share) 1.82  
Vested and released (in dollars per share) 1.88  
Forfeited (in dollars per share) 5.28  
Ending balance (in dollars per share) $ 2.48 $ 2.88
Weighted average remaining contractual term (in years) 1 year 1 month 20 days 10 months 6 days