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Stockholders Equity (Tables)
3 Months Ended
Mar. 31, 2022
Stockholders Equity (Tables) [Line Items]  
Schedule of outstanding warrants
Warrant  Issuance Date  Expiration
Date
  Exercise
Price
Per Share
   Number of
Shares of
Common Stock
Underlying
Warrants
 
Private Placement Warrants  IPO (December 13, 2018)  December 13, 2023   11.50    2,900,000 
Public Warrants  IPO (December 13, 2018)  October 28, 2024   11.50    3,500,000 
2021 Registered Direct Offering Warrants  SPA (July 28, 2021)  January 28, 2027   5.00    2,812,501 
               9,212,501 

 

Schedule of black-scholes option-pricing model
   Three Months Ended
March 31,
 
   2022   2021 
Underlying value of Common Stock ($)   1.41    7.02 
Exercise price ($)   1.41    7.02 
Expected volatility (%)   85.3    85.0 
Expected terms of the option (years)   6.11    6.11 
Risk-free interest rate (%)   2.50    1.17 

 

Schedule of options granted to purchase common stock
   For the Three Months Ended
March 31, 2022
 
   Number of
Options
   Weighted
Average
Exercise Price
   Aggregate
Intrinsic
Value
 
Outstanding at the beginning of period   4,084,549   $3.95   $             671 
Granted   1,153,500   $1.41      
Forfeited   (88,399)  $6.38      
Exercised   -   $-      
Outstanding at the end of period   5,149,650   $             3.34   $888 
Exercisable at the end of period   2,801,390           
Weighted average remaining contractual life of outstanding options – years as of March 31, 2022   7.25           

   

Schedule of share-based payment expenses
   Three Months Ended
March 31,
 
   2022   2021 
Research and development expenses, net   258    331 
General and administrative   357    199 
    615    530 
Warrant [Member]  
Stockholders Equity (Tables) [Line Items]  
Schedule of outstanding warrants
Warrant  Issuance Date  Expiration
Date
   Exercise
Price
Per Share
   Number of
Shares of
Common Stock
Underlying
Warrants
 
Private Warrants issued to scientific founders (see below)   November 27, 2017                        
             -
    2,974