Revenue from Contracts with Customers (Details 2) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 20,650,843	$ 39,665,356
North America
Revenues	19,410,144	38,542,381
Europe
Revenues	$ 1,240,699	$ 1,122,975

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details