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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Property, plant and equipment, at cost $ 13,945 $ 13,595
Less: Accumulated depreciation and impairment (13,059) (12,825)
Property, plant and equipment, net 886 770
Machinery and equipment [Member]    
Property, plant and equipment, at cost 12,284 12,482
Furniture and fixtures [Member]    
Property, plant and equipment, at cost 464 443
Leasehold improvements [Member]    
Property, plant and equipment, at cost 1,044 517
Motor vehicles [Member]    
Property, plant and equipment, at cost $ 153 $ 153