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Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
The ordinary share equivalents at September 30, 2021 and 2020 excluded from the calculation of diluted net loss per share for the three months and nine months ended September 30, 2021 and 2020 (in number of potential shares) are set forth here below:
 
    
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
 
                             
    
2021
    
2020
    
2021
    
2020
 
                             
Non-employee warrants
     256,693        225,008        256,693        225,008  
Employee warrants
     —          82,500        —          82,500  
Stock options
     2,585,710        1,596,512        2,585,710        1,596,512  
Restricted stock units
     1,104,145        713,345        1,104,145        713,345