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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 02, 2015
Intangible Assets, Net[Abstract]        
Total intangible assets, Gross $ 62,911 $ 62,911    
Accumulated amortization (31,409) (24,746)    
Total Finite Lived Intangible Assets, Net [1] 25,551      
Total Intangible Assets, Net 31,502 38,165    
Amortization of intangibles $ 6,663 7,039 $ 6,072  
Cambridge Semiconductor Limited [Member]        
Intangible Assets and Goodwill [Line Items]        
Intangible assets       $ 9,020
Minimum [Member]        
Intangible Assets and Goodwill [Line Items]        
Useful life (in years) 2 years      
Maximum [Member]        
Intangible Assets and Goodwill [Line Items]        
Useful life (in years) 12 years      
Technology licenses [Member]        
Intangible Assets, Net[Abstract]        
Finite-Lived Intangible Assets, Gross $ 3,000 3,000    
Accumulated amortization (3,000) (2,925)    
Total Finite Lived Intangible Assets, Net 0 75    
Developed technology [Member]        
Intangible Assets, Net[Abstract]        
Finite-Lived Intangible Assets, Gross 33,270 33,270    
Accumulated amortization (15,455) (11,670)    
Total Finite Lived Intangible Assets, Net $ 17,815 21,600    
Developed technology [Member] | Cambridge Semiconductor Limited [Member]        
Intangible Assets and Goodwill [Line Items]        
Intangible assets       6,600
Developed technology [Member] | Minimum [Member] | Cambridge Semiconductor Limited [Member]        
Intangible Assets and Goodwill [Line Items]        
Useful life (in years) 3 years      
Developed technology [Member] | Maximum [Member] | Cambridge Semiconductor Limited [Member]        
Intangible Assets and Goodwill [Line Items]        
Useful life (in years) 7 years      
Customer relationships [Member]        
Intangible Assets, Net[Abstract]        
Finite-Lived Intangible Assets, Gross $ 20,030 20,030    
Accumulated amortization (12,474) (10,031)    
Total Finite Lived Intangible Assets, Net $ 7,556 9,999    
Customer relationships [Member] | Cambridge Semiconductor Limited [Member]        
Intangible Assets and Goodwill [Line Items]        
Intangible assets       $ 2,420
Useful life (in years) 5 years      
Leases, Acquired-in-Place [Member]        
Intangible Assets, Net[Abstract]        
Finite-Lived Intangible Assets, Gross $ 660 660    
Accumulated amortization (480) (120)    
Total Finite Lived Intangible Assets, Net 180 540    
Internet Domain Names [Member]        
Intangible Assets, Net[Abstract]        
Indefinite-lived intangible assets 1,261 1,261    
In-process research and developement [Member]        
Intangible Assets, Net[Abstract]        
Finite-Lived Intangible Assets, Gross 4,690 4,690    
Total Finite Lived Intangible Assets, Net 4,690 $ 4,690    
In-process research and developement [Member] | Early Stage Research And Developement Company [Member]        
Intangible Assets and Goodwill [Line Items]        
Finite-lived intangible assets $ 4,690      
[1] The total above excludes $4.7 million of in-process R&D which will be amortized upon completion of development over the estimated useful life of the technology.