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Intangible Assets and Goodwill - Annual Future Amortization Expense (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining in 2018 $ 8,590,075  
2019 9,678,071  
2020 7,678,479  
2021 6,653,100  
2022 4,053,626  
Thereafter 9,440,831  
Intangible assets - net $ 46,094,182 $ 48,719,428