Leases - Summary of Components of Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Lease cost
Operating lease cost	$ 64	$ 64	$ 191	$ 191
Finance lease cost	0	0	0	0
Amortization of right-of-use assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Variable lease costs	0	0	0	0
Total lease cost	64	64	191	191
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	63	67	194	200
Operating cash flows from finance leases	0	0	0	0
Financing cash flows from finance leases	0	0	0	0
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	403	0	403	0
Finance leases	$ 0	$ 0	$ 0	$ 0