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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (VIE) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets:            
Accounts receivable, net $ 570   $ 874      
Total assets 31,605   20,713      
Liabilities:            
Accrued expenses 1,565   2,036      
Total liabilities 5,688   6,551      
Total stockholders' equity 25,917 $ 27,258 14,162 $ 13,861 $ 12,627 $ 13,205
Variable Interest Entity, Primary Beneficiary [Member]            
Assets:            
Accounts receivable, net 205   538      
Total assets 205   538      
Liabilities:            
Accrued expenses 19   27      
Total liabilities 19   27      
Noncontrolling Interest in Joint Venture 37   27      
Total stockholders' equity $ 72   $ 53