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Stock Option Plans - Liberty Bell Stock Option Plan (Details) - Liberty 2004 Stock Option Plan - Stock options
1 Months Ended 12 Months Ended
Feb. 28, 2018
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2004
Equity Compensation        
Contractual life       10 years
Vesting period (in years)       5 years
Conversion ratio, stock based compensation 0.2857      
Number of options converted | shares 48,225      
Number of options exercised | shares   0 5,062  
Exercise price of option converted | $ / shares $ 1.18      
Number of options outstanding after conversion | shares 13,771      
Exercise price of option exercised | $ / shares $ 4.14   $ 4.14  
Shares | shares   8,709    
Employees        
Equity Compensation        
Exercise price of option outstanding | $ / shares   $ 4.14    
Shares | shares   2,355    
Average price | $ / shares   $ 4.14    
Amount | $   $ 9,750    
Directors        
Equity Compensation        
Exercise price of option outstanding | $ / shares   $ 4.14    
Shares | shares   6,354    
Average price | $ / shares   $ 4.14    
Amount | $   $ 26,306