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Share Capital (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Aug. 13, 2018
May 24, 2018
Apr. 10, 2018
Feb. 28, 2018
Dec. 28, 2017
Dec. 06, 2017
Sep. 14, 2017
Jun. 05, 2017
May 09, 2017
Jan. 05, 2017
Dec. 27, 2016
Dec. 16, 2016
May 02, 2016
Nov. 30, 2017
May 31, 2017
Sep. 30, 2014
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Preferred stock, par value                                 $ 0.01   $ 0.01      
Authorized capital stock                                 221,000,000          
Common stock, shares authorized                                 220,000,000   220,000,000      
Ordinary shares, par value                                 $ 0.01   $ 0.01      
Preferred stock, shares authorized                                 1,000,000   1,000,000      
Common stock, shares issued, including temporary equity                                         2,837,863  
Common stock, shares outstanding, including temporary equity                                         2,837,863  
Preferred stock, shares issued                                 550   4,001      
Preferred stock, shares outstanding                                 550   4,001      
Proceeds from issuance of shares                                 $ 12,704        
Number of stock options granted                                 10,000   272,090 [1]      
Weighted-average exercise price per share, granted                                 $ 9   $ 16.50 [1]      
Stock-based employee compensation                                 $ 1,139 196        
Number of shares issued during period                                          
Loss on extinguishment of convertible note                                 2,364        
Repurchase of common stock                                 $ 500          
Fair market value percentage                                 25.00%          
Temporary equity value                                 $ 500          
Microbot Israel [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 675          
CardioSert Ltd [Member]                                            
Number of common shares issued for acquisition   6,738 6,738                                      
CardioSert Ltd [Member] | Research and Development Expense [Member]                                            
Stock-based employee compensation   $ 74                                        
Alpha Capital [Member]                                            
Preferred stock, par value                       $ 0.01                    
Rights to acquire shares of common stock                       655,967                    
Designated preferred stock                       9,736                    
Number of shares issued during period                       655,967                    
Common stock shares issued and outstanding reduced during the period                       1,786,684                    
Purchaser [Member]                                            
Number of common stock shares sold during the period                   47,163                        
Common stock price per share                   $ 74                        
Proceeds from issuance of shares                   $ 3,500                        
Placement agent fee                   $ 210                        
Investor [Member]                                            
Number of common stock shares sold during the period               252,658                            
Common stock price per share               $ 40                            
Proceeds from issuance of shares               $ 10,125                            
Placement agent fee               $ 922                            
Board of Directors [Member]                                            
Number of stock options granted           12,698                                
Weighted-average exercise price per share, granted           $ 15.75                                
Stock option vested term           3 years                                
Board of Directors [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 55 0        
Board of Directors [Member] | NIS [Member]                                            
Ordinary shares, par value                         $ 0.001                  
Board of Directors [Member] | Microbot Israel [Member]                                            
Number of stock options granted                         33,333     26,906            
Number of stock option granted as adjustment of reflect merger                         96,482     77,846            
Weighted-average exercise price per share, granted                         $ 20.25     $ 12            
Stock option merger retroactively adjusted exercise price per share                         $ 7.05     $ 4.2            
Harel Gadot [Member]                                            
Number of stock options granted             120,848                              
Weighted-average exercise price per share, granted             $ 15.75                              
Harel Gadot [Member] | Minimum [Member]                                            
Stock option vested term             3 years                              
Harel Gadot [Member] | Maximum [Member]                                            
Stock option vested term             5 years                              
Harel Gadot [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 460 0        
Hezi Himelfarb [Member]                                            
Number of stock options granted             72,508                              
Weighted-average exercise price per share, granted             $ 19.35                              
Stock option vested term             3 years                              
Hezi Himelfarb [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 329 0        
Employees [Member]                                            
Ordinary shares, par value       $ 0.001                                    
Number of stock options granted         66,036                                  
Weighted-average exercise price per share, granted         $ 15.3                                  
Stock option vested term         3 years                                  
Number of option exercised       2,487                                    
Employees [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 273 0        
Employees and Consultant [Member]                                            
Number of option exercised                           31,453                
Employees and Consultant [Member] | NIS [Member]                                            
Ordinary shares, par value                           $ 0.001                
Mr. Simon Sharon [Member]                                            
Number of stock options granted 10,000                                          
Weighted-average exercise price per share, granted $ 9                                          
Stock option vested term 3 years                                          
Mr. Simon Sharon [Member] | General and Administrative Expense [Member]                                            
Stock-based employee compensation                                 $ 22 $ 0        
Advisors [Member] | Restricted Stock [Member]                                            
Common stock price per share                                 $ 19.2          
Number of shares issued for services                                 525,706          
Number of shares issued for services, value                                 $ 10,000          
Advisors [Member] | General and Administrative Expense [Member] | Restricted Stock [Member]                                            
Stock-based employee compensation                                 $ 7,300          
Consultant [Member]                                            
Stock-based employee compensation                                     $ 225      
Number of shares issued for services                                     8,085      
Warrant [Member]                                            
Cashless exercise warrants                                           52
Series A Convertible Preferred Stock [Member]                                            
Conversion of stock into shares                                 3,451   8,990      
Preferred stock, shares issued                                         2,464  
Preferred stock, shares outstanding                                         2,464  
Common Stock [Member]                                            
Conversion of stock into shares [2]                                 232,151   605,705      
Rights to acquire shares of common stock                     655,962                      
Number of option exercised [2]                                 2,487   31,787      
Number of shares issued during period [2]                                     299,815      
Common Stock [Member] | Directors [Member]                                            
Number of stock options granted           12,698                                
Common Stock [Member] | Employees [Member]                                            
Number of stock options granted         66,036                                  
Before Reverse Split [Member]                                            
Common stock, shares issued, including temporary equity                                         42,120,127  
Common stock, shares outstanding, including temporary equity                                         42,120,127  
Before Reverse Split [Member] | CardioSert Ltd [Member]                                            
Number of common shares issued for acquisition   100,000 100,000                                      
Before Reverse Split [Member] | Alpha Capital [Member]                                            
Rights to acquire shares of common stock                       9,736,000                    
Number of shares issued during period                       9,735,925                    
Common stock shares issued and outstanding reduced during the period                       26,518,315                    
Before Reverse Split [Member] | Purchaser [Member]                                            
Number of common stock shares sold during the period                   700,000                        
Common stock price per share                   $ 5.00                        
Before Reverse Split [Member] | Investor [Member]                                            
Number of common stock shares sold during the period               3,750,000                            
Common stock price per share               $ 2.70                            
Before Reverse Split [Member] | Board of Directors [Member]                                            
Number of stock options granted           190,475                                
Weighted-average exercise price per share, granted           $ 1.05                                
Before Reverse Split [Member] | Board of Directors [Member] | Microbot Israel [Member]                                            
Number of stock options granted                         500,000     403,592            
Weighted-average exercise price per share, granted                         $ 1.35     $ 0.8            
Before Reverse Split [Member] | Harel Gadot [Member]                                            
Number of stock options granted             1,812,712                              
Weighted-average exercise price per share, granted             $ 1.05                              
Before Reverse Split [Member] | Hezi Himelfarb [Member]                                            
Number of stock options granted             1,087,627                              
Weighted-average exercise price per share, granted             $ 1.29                              
Before Reverse Split [Member] | Employees [Member]                                            
Number of stock options granted         990,543                                  
Weighted-average exercise price per share, granted         $ 1.02                                  
Number of option exercised       37,300                                    
Before Reverse Split [Member] | Employees and Consultant [Member]                                            
Number of option exercised                           471,794                
Before Reverse Split [Member] | Mr. Simon Sharon [Member]                                            
Number of stock options granted 150,000                                          
Weighted-average exercise price per share, granted $ 0.6                                          
Before Reverse Split [Member] | Advisors [Member] | Restricted Stock [Member]                                            
Common stock price per share                                 $ 1.28          
Number of shares issued for services                                 7,802,639          
Before Reverse Split [Member] | Consultant [Member]                                            
Number of shares issued for services                                     120,000      
Before Reverse Split [Member] | Warrant [Member]                                            
Cashless exercise warrants                                           768
Before Reverse Split [Member] | Common Stock [Member]                                            
Conversion of stock into shares                                     8,990,000      
Rights to acquire shares of common stock                     9,735,925                      
Series A Convertible Preferred Stock [Member]                                            
Preferred stock, par value                             $ 0.01         $ 0.01    
Conversion of stock into shares                             67   232,151     67    
Designated preferred stock                     9,736                      
Series A Convertible Preferred Stock [Member] | Securities Purchase Agreement [Member]                                            
Loan bears interest rate                 6.00%                          
Debt maturity date                 Nov. 28, 2016                          
Debt instrument face amount                 $ 2,029                          
Series A Convertible Preferred Stock [Member] | Alpha Capital [Member] | Securities Purchase Agreement [Member]                                            
Number of shares issued during period                 3,254                          
Loss on extinguishment of convertible note                 $ 2,360                          
Series A Convertible Preferred Stock [Member] | Before Reverse Split [Member]                                            
Conversion of stock into shares                             1,000   3,445,266     1,000    
Common Stock [Member]                                            
Cashless exercise warrants                                           24
Common Stock [Member] | Before Reverse Split [Member]                                            
Cashless exercise warrants                                           359
[1] December 31, 2017 share data represents the number of shares adjusted to retroactively reflect the 1:15 reverse stock split effected on September 4, 2018.
[2] December 31, 2017 and 2016 share data represents the number of shares adjusted to retroactively reflect the 1:15 reverse stock split effected on September 4, 2018.