Income Taxes - Income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Current:
U.S. federal	$ 0	$ 0
State & local	0	0
Foreign	0	0
Total current	0	0
Deferred:
U.S. federal	63	0
State & local	0	0
Foreign	0	0
Total deferred	63	0
Total tax provision (benefit)	$ 63	$ 0