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DETAILS OF CERTAIN FINANCIAL STATEMENT COMPONENTS - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, plant and equipment, net      
Property, plant and equipment, gross $ 2,205   $ 2,200
Less: accumulated depreciation (1,841)   (1,793)
Total property, plant and equipment, net 364   407
Depreciation expense 54 $ 59  
Furniture, machinery and equipment      
Property, plant and equipment, net      
Property, plant and equipment, gross 1,661   1,662
Leasehold improvements      
Property, plant and equipment, net      
Property, plant and equipment, gross $ 544   $ 538