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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Total revenue $ 5,399,186 $ 4,536,173 $ 10,745,938 $ 8,896,867
North America and Caribbean        
Disaggregation Of Revenue [Line Items]        
Total revenue 3,907,953 3,494,692 7,752,478 6,945,401
Europe        
Disaggregation Of Revenue [Line Items]        
Total revenue $ 1,491,233 $ 1,041,481 $ 2,993,460 $ 1,951,466