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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Issuance expenses paid $ 1,505
Issuance expenses in an amount 3,600
Best Offering [Member]      
Issuance expenses paid 1,056 686  
Registered Direct [Member]      
Issuance expenses paid 977 1,035  
Private Placement [Member]      
Issuance expenses paid 959    
Investment Agreement [Member]      
Issuance expenses paid     830
Atm Offering Program [Member]      
Issuance expenses paid   $ 211
Warrant Exercise [Member]      
Issuance expenses paid   $ 1,019