Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Estimated Future Minimum Rental Payments (Details)

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Commitments and Contingencies - Estimated Future Minimum Rental Payments (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Estimated future minimum rental payments on the leases      
2018 $ 437,900    
2019 182,251    
2020 165,116    
2021 86,638    
TOTAL 871,905    
Total rent expense $ 494,000 $ 433,000 $ 351,000