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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2019
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Oct. 31, 2017
Guarantor Obligations [Line Items]              
Outstanding inventory purchase commitments     $ 14,083 $ 24,939      
Inventory purchase commitments, sole or limited suppliers     9,821 12,718      
Amount of claim, including interest, penalties and legal fees     6,825        
Principal Amount of Claim     777       $ 6,300
Amount of reduction of costs in cost of sales       3,260      
Aggregate amount of guarantees     111,444        
Restricted cash collateral     25,771        
Settlement amount of arbitration           $ 400  
Loss for firm non-cancelable and unconditional purchase commitments     342 1,016 $ 1,448    
GTH Peru [Member]              
Guarantor Obligations [Line Items]              
Arbitration award amount   $ 14,000          
Period of claim collection 5 years            
Period of occurrence 2015-2019            
Peru [Member]              
Guarantor Obligations [Line Items]              
Aggregate amount of guarantees     108,690        
Aggregate amount         154,000    
Spacenet Inc. [Member]              
Guarantor Obligations [Line Items]              
Service expenses     $ 10,374 9,845 12,771    
OCS [Member]              
Guarantor Obligations [Line Items]              
Percentage of amount funded for research and development projects     100.00%        
Income from IIA grants     $ 1,351 1,518 1,215    
Accrued royalties     1,441        
Royalties paid     $ 38 $ 68 $ 20    
OCS [Member] | Minimum [Member]              
Guarantor Obligations [Line Items]              
Royalty fee (as a percent)     3.00%        
OCS [Member] | Maximum [Member]              
Guarantor Obligations [Line Items]              
Royalty fee (as a percent)     5.00%        
BIRD [Member]              
Guarantor Obligations [Line Items]              
Royalty fee (as a percent)     5.00%        
Percentage of amount funded for research and development projects     150.00%        
Accrued royalties     $ 306