Annual report pursuant to Section 13 and 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 ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]    
Total revenue $ 18,560,668 $ 14,855,576
North America and Caribbean    
Disaggregation Of Revenue [Line Items]    
Total revenue 14,275,967 12,121,327
Europe    
Disaggregation Of Revenue [Line Items]    
Total revenue $ 4,284,701 $ 2,734,249