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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Selling, general and administrative expenses (Details 2) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Compensation, employee benefits and related taxes $ 792,303 $ 784,473 $ 1,446,603 $ 1,623,686
Advertising and other marketing 2,712 7,047 15,600 12,035
Depreciation 43,633 17,796 71,620 34,560
Rent, utilities, telephone and communications 37,650 42,343 73,570 81,803
Professional fees 159,734 115,243 261,675 274,786
Other general and administrative 225,846 (146,850) 527,868 383,437
Total selling, general and administrative expenses $ 1,261,878 $ 820,052 $ 2,396,936 $ 2,410,307