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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Future Minimum Payments of Notes Payable

Future minimum principal payments under long-term debt as of December 31, 2017 are as follows:

 

Years Ending December 31,   Principal
Payments
 
2018   $ 1,665,000  
2019     1,808,000  
2020     1,650,000  
Total   $ 5,123,000