Quarterly report pursuant to Section 13 or 15(d)

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)

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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]      
Accrued payroll and other benefits $ 2,372,799 $ 1,659,577  
Accrued professional fees 174,439 126,384  
Accrued interest 137,384 138,605  
D&O insurance financing payable 134,640 52,530  
Accrued travel and entertainment 129,673 30,000  
Other accrued expenses 81,296  
Accrued rent and facilities costs 33,727 160,544  
Deferred revenue 18,173 20,631 $ 30,690
TOTAL ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES $ 3,082,131 $ 2,188,271