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Common Stock Warrants (Details Narrative)
$ / shares in Units, $ in Thousands
 1 Months Ended 8 Months Ended 12 Months Ended
Nov. 15, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
May 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Nov. 30, 2018
$ / shares
shares
Warrants issued to purchase common stock | shares           1,718,184  
Warrants exercise price | $ / shares           $ 3.04  
Warrants, fair value | $       $ 41   $ 2,583  
Expected term           6 years 3 months 19 days  
Volatility rate       85.00%   85.00%  
Expected dividends rate       0.00%   0.00%  
Warrant [Member]              
Warrants issued to purchase common stock | shares             414,000
Warrants exercise price | $ / shares             $ 7.50
Warrant [Member] | Consultant and Placement Agent [Member]              
Weighted average exercise price of warrants | $ / shares       $ 1.56 $ 1.56 $ 3.04  
Redeemable Convertible Preferred Stock - Series A [Member]              
Warrants, fair value | $ $ 3,103       $ 520    
Expected term 5 years            
Volatility rate 85.00%            
Risk-free interest rate 2.90%            
Preferred stock, issuance costs | $   $ 479          
Common stock issued upon warrants conversion basis   1.333          
Common stock issued upon warrants conversion basis, description   Prior to the Company's IPO in November 2018, the number of common shares issuable upon the exercise of this warrant was not fixed as it could vary by a factor of 1.000 to 1.333 common shares per warrant share in accordance with the IPO price, and the Company considered the warrant to be a derivative instrument (see Note 4).          
Increase in fair value of warrant | $ $ 2,583       $ 41    
Placement Agent [Member] | Redeemable Convertible Preferred Stock - Series A [Member]              
Warrants issued to purchase common stock | shares   649,409          
Warrants exercise price | $ / shares   $ 3.00          
Warrants conversion, description   The warrant adjusted to entitle the holder to purchase shares of common stock equal to 10.0% of the shares of common stock issuable upon conversion of the Series A Preferred (excluding 191,000 shares of Series A Preferred that were purchased by insiders) and the exercise price would adjust to the conversion price of the Series A Preferred. This warrant vested at issuance in June 2017.          
Common stock issuable upon conversion of preferred stock | shares   191,000          
Initial Public Offering [Member] | Redeemable Convertible Preferred Stock - Series A [Member]              
Number of shares issuable upon exercise warrants | shares 704,184            
General and Administrative Expense [Member]              
Consulting warrants expense | $     $ 121        
Business Strategy and Intellectual Property Advisory Services [Member]              
Warrants issued to purchase common stock | shares     600,000        
Warrants exercise price | $ / shares     $ 0.01        
Warrants expiration term     5 years        
Warrants, fair value | $     $ 121        
Expected term     5 years        
Volatility rate     85.00%        
Risk-free interest rate     1.80%        
Expected dividends rate     0.00%