Leases - Schedule of Weighted Average Remaining Lease Terms and Discount Rate of Operating Leases (Detail)	Mar. 31, 2020	Mar. 31, 2019
Office Leases [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	1 year 3 months 7 days	2 years 3 months 25 days
Weighted average discount rate	3.50%	4.10%
Vehicles [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	6 months 18 days	4 months 24 days
Weighted average discount rate	1.00%	0.50%
Office Equipment [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	25 days	1 month 13 days
Weighted average discount rate	0.20%	0.20%