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GENERAL (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
General (Textual)        
Accumulated deficit   $ (181,445) $ (168,469)  
Negative cash flow from operations   (12,589) (14,815) $ (14,774)
Net loss   (12,976) (15,551) $ (21,675)
Cash and cash equivalents   $ 20,350 $ 16,253  
Subsequent Event [Member]        
General (Textual)        
Proceeds from warrants exercise $ 13,200