Leases - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Lessee Lease Description [Line Items]
Operating lease, liabilities current	$ 228,000	$ 241,000
Finance lease, liabilities current	1,000	1,000
Operating lease, liabilities non-current	129,000	234,000
Finance lease, liabilities, non-current	3,000	4,000
Operating right-of-use assets	330,000	442,000
Finance lease right-of-use assets	$ 4,000	$ 5,000
Minimum
Lessee Lease Description [Line Items]
Non-cancellable lease terms	3 years
Maximum
Lessee Lease Description [Line Items]
Non-cancellable lease terms	5 years