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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Changes in AOCI, including the Amounts Reclassified to Income) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 07, 2015
Nov. 14, 2014
Feb. 28, 2015
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Beginning balance           $ 63,754   $ 63,754 $ 65,862  
Loss recorded in other comprehensive loss               (1,611) (2,902) $ (6,671)
Unrealized gain from available-for-sale investments               (673) 673  
Less: Gain (loss) reclassified from AOCI to income                 (121) 7,088
Ending balance       $ 61,470       61,470 63,754 65,862
Fair value of investment       5,700       5,700 50,499  
Investment       26,022       26,022 59,799  
Net loss from the cumulative translation adjustment                 100 7,100
Foreign currency translation gain (loss)               (200) (600) $ 3,900
Cost-method Investments [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Investment       12,094       12,094 2,371  
Available-for-sale Securities [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Investment       $ 5,700       $ 5,700 $ 48,200  
Cortina [Member] | Cost-method Investments [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Realized gain loss on disposal             $ 1,500      
Investment, ownership interest (as a percent)   1.00%                
Investment              
Inphi Corporation [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Release from escrow deposit       $ 300            
Inphi Corporation [Member] | Available-for-sale Securities [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Unrealized gain from available-for-sale investments                 $ 500  
Cash consideration     $ 2,400         $ 1,000    
Realized gain loss on disposal     $ 600              
Number of shares received in exchange for investment   124,395 124,395              
Fair value of investment                 2,300  
Cash received in exchange for investment         $ 700 $ 2,400        
UTStarcom Hong Kong Holdings Ltd [Member] | Cost-method Investments [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Reversed unrealized gain $ 200                  
Investment, ownership interest (as a percent) 14.00%                  
Investment       $ 10,000       $ 10,000    
UTStarcom Hong Kong Holdings Ltd [Member] | Available-for-sale Securities [Member]                    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                    
Partial payment of the principal of convertible bond $ 10,000                  
Investment $ 20,000           $ 20,200