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Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Mar. 31, 2026
Property, plant and equipment, net
Total property, plant and equipment	$ 29,144		$ 29,144		$ 29,705
Less: Accumulated depreciation	(18,441)		(18,441)		(16,731)
Property, plant and equipment, net	10,703		10,703		12,974
Depreciation and amortization expense	800	$ 800	1,710	$ 1,715
Office equipment
Property, plant and equipment, net
Total property, plant and equipment	1,897		1,897		1,897
Computer equipment
Property, plant and equipment, net
Total property, plant and equipment	2,516		2,516		2,441
Plant, manufacturing and laboratory equipment
Property, plant and equipment, net
Total property, plant and equipment	12,727		12,727		12,325
Leasehold improvements
Property, plant and equipment, net
Total property, plant and equipment	2,504		2,504		2,504
Capitalized software
Property, plant and equipment, net
Total property, plant and equipment	9,361		9,361		9,736
Amortization	300	$ 300	600	$ 600
Construction in progress
Property, plant and equipment, net
Total property, plant and equipment	$ 139		$ 139		$ 802