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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Accounting Policies [Abstract]        
Number of operating segments | segment     1  
Write-offs charged against allowance | $ $ 0 $ 0 $ 0 $ 0