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Income Taxes (Schedule of Net Operating Loss Carryforwards) (Details)
Dec. 31, 2017
USD ($)
Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 51,519,487
State  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 55,942,341
Expiration from 2018-2019 | Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
Expiration from 2018-2019 | State  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 238,047
Expiration from 2020 to 2028 | Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
Expiration from 2020 to 2028 | State  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 38,858,730
Expiration from in 2029 | Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 44,153,819
Expiration from in 2029 | State  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 10,513,791
Expiration from 2030 to 2037 | Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 7,365,668
Expiration from 2030 to 2037 | State  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 6,331,773