LEASES - Right-of-use assets and lease liabilities relating to operating and finance leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Right-of-use assets:
Operating leases	$ 6,141	$ 3,595
Finance leases	2,841
Total right-of-use assets	8,952	3,595
Lease liabilities:
Operating lease	6,141	3,595
Finance lease	2,419
Total lease liabilities	$ 8,560	$ 3,595