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BALANCE SHEET DETAILS - Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment      
Total $ 33,197 $ 54,633  
Less: accumulated depreciation (31,587) (53,123)  
Total Property, plant and equipment, net 1,610 1,510  
Write off of fully depreciated property, plant and equipment 19,600 2,800 $ 7,300
Accumulated depreciation related to derecognized amount of property, plant and equipment 19,600 2,800 $ 7,300
Leasehold improvements      
Property, Plant and Equipment      
Total 1,591 4,902  
Accelerated depreciation related to early termination of a lease   100  
Automobiles      
Property, Plant and Equipment      
Total 1,765 1,748  
Software      
Property, Plant and Equipment      
Total 3,267 5,151  
Computer, Equipment and Furniture      
Property, Plant and Equipment      
Total 26,507 42,786  
Other      
Property, Plant and Equipment      
Total $ 67 $ 46