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Stockholders' Equity and Warrants (Summary of Warrants Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Warrants      
Warrants outstanding at beginning of period 110,884 110,884  
Granted  
Exercised  
Expired (110,884)  
Warrants outstanding at end of period 110,884 110,884
Weighted Average Exercise Price      
Warrants outstanding at beginning of period $ 6.60 $ 6.60  
Granted  
Exercised  
Expired $ 6.60  
Warrants outstanding at end of period   $ 6.60 $ 6.60
Weighted Average Remaining Term (Years)   10 months 14 days 1 year 10 months 14 days