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BALANCE SHEET DETAILS - Schedule of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Total $ 28,773 $ 30,671
Less: accumulated depreciation (28,171) (30,051)
Total Property, plant and equipment, net 602 620
Leasehold improvements    
Property, Plant and Equipment    
Total 1,801 1,846
Automobiles    
Property, Plant and Equipment    
Total 271 340
Computers and Software    
Property, Plant and Equipment    
Total 4,461 4,579
Equipment and Furniture    
Property, Plant and Equipment    
Total $ 22,240 $ 23,906