Discontinued Operations - Schedule of Condensed Operating (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Operating expenses:
Net loss from discontinued operations	$ (18,760)	$ (18,276)	$ (45,689)	$ (81,505)
Discontinued Operations
Operating expenses:
Research and development	6,700	16,996	31,611	77,779
Restructuring charges incurred during the period	12,060	1,280	14,078	3,726
Total operating expenses	18,760	18,276	45,689	81,505
Net loss from discontinued operations	(18,760)	(18,276)	(45,689)	(81,505)
Operating lease costs	900	1,100	3,000	3,100
Variable lease, cost	300	200	800	600
Income tax related to discontinued operations	0	0	0	0
Related Party
Operating expenses:
Net loss from discontinued operations	(260)	(2,781)	(445)	(10,989)
Related Party | Discontinued Operations
Operating expenses:
Research and development	$ 260	$ 2,781	$ 445	$ 10,989