8. LEASES - Operating leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020
Leases
Operating lease, option to extend	true
Operating lease, renewal term	5 years
Operating lease right-of-use assets	$ 465	$ 617
Lease liabilities, current	405	498
Lease liabilities, non-current	84	142
Total operating lease liabilities	$ 489	$ 640
Minimum
Leases
Operating lease, term of lease	2 months
Maximum
Leases
Operating lease, term of lease	22 months