REVENUE RECOGNITION - Summary of Disaggregation of Revenue by Geographic Location (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 4,282,901	$ 4,494,318
North America and Caribbean
Disaggregation Of Revenue [Line Items]
Total revenue	2,451,896	3,130,465
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,831,005	$ 1,363,853

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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