v3.19.1
GENERAL (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Jan. 24, 2019
Oct. 17, 2018
Organization Consolidation and Presentation of Financial Statements [Line Items]        
Accounts receivable pledged to offset accounts payable $ 1,784      
Accounts Payable [Member]        
Organization Consolidation and Presentation of Financial Statements [Line Items]        
Concentration risk (as a percent) 48.70% 58.80%    
SMRE [Member]        
Organization Consolidation and Presentation of Financial Statements [Line Items]        
Percentage of acquisition     56.80%  
Kokam [Member]        
Organization Consolidation and Presentation of Financial Statements [Line Items]        
Percentage of acquisition 94.20%     74.50%