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Business Combination and Goodwill - Total Purchase Consideration (Details) - USD ($)
12 Months Ended
Dec. 08, 2017
Dec. 31, 2019
Dec. 31, 2017
Option Indexed to Issuer's Equity [Line Items]      
Equity consideration $ 61,092,050   $ 61,092,050
Fair value of equity interest in acquiree 1,055,333    
Total purchase consideration 86,394,383    
Preferred stock      
Option Indexed to Issuer's Equity [Line Items]      
Fair value of equity interest in acquiree 19,118,000 $ 19,100,000  
NMM | Noncontrolling Interest      
Option Indexed to Issuer's Equity [Line Items]      
Fair value of equity interest in acquiree $ 5,129,000