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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ (525)    
Changes in other comprehensive income (loss) before reclassifications 914    
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Net current-period other comprehensive income (loss) 671 $ 242 $ (803)
Balance 146 (525)  
Unrealized gains (losses) on cash flow hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (846)    
Changes in other comprehensive income (loss) before reclassifications 723    
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Net current-period other comprehensive income (loss) 520    
Balance (326) (846)  
Unrealized gain (losses) on marketable securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 321    
Changes in other comprehensive income (loss) before reclassifications 191    
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Net current-period other comprehensive income (loss) 151    
Balance 472 $ 321  
Cost of revenues [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income (5)    
Cost of revenues [Member] | Unrealized gains (losses) on cash flow hedges [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income (5)    
Cost of revenues [Member] | Unrealized gain (losses) on marketable securities [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income    
Operating expenses [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income (198)    
Operating expenses [Member] | Unrealized gains (losses) on cash flow hedges [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income (198)    
Operating expenses [Member] | Unrealized gain (losses) on marketable securities [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income    
Financial income, net [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income (40)    
Financial income, net [Member] | Unrealized gains (losses) on cash flow hedges [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income    
Financial income, net [Member] | Unrealized gain (losses) on marketable securities [Member]      
Amounts reclassified from accumulated other comprehensive income (loss) to :      
Amounts reclassified from accumulated other comprehensive income $ (40)