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Investment in Affiliated Company (Details) - USD ($)
$ / shares in Units, $ in Thousands
4 Months Ended 12 Months Ended
Nov. 01, 2018
Jul. 12, 2018
Jan. 10, 2018
Nov. 07, 2016
Aug. 04, 2016
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 01, 2018
Investment in Affiliated Company (Details) [Line Items]                    
Investments             $ 6,729 $ 7,568    
Equity method investment, percentage           29.71% 21.34%     32.74%
Percentage of diluted basis           33.90%        
Equity in net loss (gain) of an affiliated company           $ 453 $ (839) (2,905) $ 156  
Revaluation of investments             324      
Proceeds from Sale of Equity Method Investments             1,941 453    
Aggregate contribution on Warrant               9,069    
Aggregate contribution paid in cash               5,065    
Revaluation of derivative warrant liabilities             $ 1 $ (2,071) $ 12,180  
Warrants 2 [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Number of warrants sold (in Shares)             4,194      
Warrants aggregate price             $ 21      
Rail Vision Ltd [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Description of share purchase agreement         the Company entered into a Share Purchase Agreement to acquire up to 36% of the share capital of Rail Vision at an average price per share of USD 60 and three types of warrants to purchase ordinary shares of Rail Vision: Warrant 1, Warrant 2 and Warrant 3 exercisable within 18 months, 30 months and 24 months following their issuance, at an exercise price of USD 189, USD 270 and USD 216, respectively.          
Investments       $ 1,422            
Equity method investment, percentage 35.91%     32.00%     24.12%      
Percentage of diluted basis 33.81%     48.00%     21.67%      
Private placements gross amount           $ 2,700        
Investments             $ 10,000      
Revaluation of investments             $ 47,000      
Aggregate contribution on Warrant $ 9,069 $ 9,069 $ 9,069              
Aggregate contribution paid in cash 5,065 5,065 5,065              
Revaluation of derivative warrant liabilities $ 4,004 $ 4,004 $ 4,004              
Rail Vision Ltd [Member] | Ordinary Shares [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Purchased ordinary shares (in Shares)       23,692            
Price per share (in Dollars per share)       $ 60,000     $ 244      
Shares issued (in Shares)             40,984      
Warrants issued (in Shares)             14,903      
Exercised warrants to purchase ordinary shares (in Shares)     26,396              
Rail Vision Ltd [Member] | Warrants 1 [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Purchased ordinary shares (in Shares)       23,692            
Exercised warrants to purchase ordinary shares (in Shares) 23,692 23,692 23,692              
Rail Vision Ltd [Member] | Warrants 2 [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Purchased ordinary shares (in Shares)       23,692            
Rail Vision Ltd [Member] | Warrants 3 [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Purchased ordinary shares (in Shares)       2,704            
Exercised warrants to purchase ordinary shares (in Shares) 2,704 2,704 2,704              
Rail Vision Ltd [Member] | Warrant [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Warrants issued (in Shares)             14,903      
Knorr-Bremse [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Equity method investment, percentage             35.91% 24.12%    
Proceeds from Sale of Equity Method Investments             $ 1,941      
Knorr-Bremse [Member] | Warrant [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Exercised warrants to purchase ordinary shares (in Shares)             3,007      
Ordinary Shares [Member]                    
Investment in Affiliated Company (Details) [Line Items]                    
Equity method investment, percentage             21.19%