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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (VIE) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:        
Accounts receivable, net $ 625 $ 874    
Total assets 20,423 20,713    
Liabilities:        
Accrued expenses 1,761 2,036    
Total liabilities 5,865 6,551    
Total stockholders' equity 14,558 14,162 $ 11,285 $ 13,205
Variable Interest Entity, Primary Beneficiary [Member]        
Assets:        
Accounts receivable, net 390 538    
Total assets 390 538    
Liabilities:        
Accrued expenses 15 27    
Total liabilities 15 27    
Noncontrolling Interest in Joint Venture 28 27    
Total stockholders' equity $ 56 $ 53