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Loss Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Loss Per Common Share
    For the years ended December 31,  
    2018     2019     2020  
Net loss available to common stockholders   $ (8,214 )   $ (8,330 )   $ (6,982 )
                         
Weighted average number of common shares, basic and diluted     20,894,202       21,161,164       21,548,126  
                         
Loss per common share, basic and diluted   $ (0.39 )   $ (0.39 )   $ (0.32 )