Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
financial_institution
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Concentration Risks, Types, No Concentration Percentage      
Number of financial institutions where the company holds checking deposits | financial_institution 1    
Restricted Cash      
Restricted cash $ 150,000 $ 211,000 $ 150,000
Allowance for doubtful accounts 0   0
Income Taxes      
Income tax penalties and interest accrued 0   $ 0
Income tax penalties and interest expense $ 0 $ 0  
Minimum      
Property and Equipment      
Useful life (in years) 3 years    
Maximum      
Property and Equipment      
Useful life (in years) 5 years    
Letter of Credit      
Restricted Cash      
Letter of credit annual step down $ 50,000