Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Summary of Disaggregation of Revenue by Geographic Location (Details)

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REVENUE RECOGNITION - Summary of Disaggregation of Revenue by Geographic Location (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Total revenue $ 5,371,646 $ 4,775,784 $ 16,117,583 $ 13,672,650
North America and Caribbean        
Disaggregation Of Revenue [Line Items]        
Total revenue 3,891,875 3,622,729 11,644,353 10,568,129
Europe        
Disaggregation Of Revenue [Line Items]        
Total revenue $ 1,479,771 $ 1,153,055 $ 4,473,230 $ 3,104,521