Leases - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Rent expense	$ 14,000	$ 79,000	$ 155,000	$ 235,000
Incremental borrowing rate to calculate present value of lease payments	11.00%		11.00%
New Jersey [Member] | Office Space [Member]
Lessee Lease Description [Line Items]
Operating lease, expiration term			2023-02