Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Rent expense $ 3,381,825 $ 2,844,010
Leases not yet commenced, liability $ 1,300,000  
Minimum    
Lessee, Lease, Description [Line Items]    
Term of leases not yet commenced 5 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Term of leases not yet commenced 10 years