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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - Money Market - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets    
Restricted cash equivalents – money market $ 4,100 $ 4,144
Level 1    
Assets    
Restricted cash equivalents – money market 4,100 4,144
Level 2    
Assets    
Restricted cash equivalents – money market 0 0
Level 3    
Assets    
Restricted cash equivalents – money market $ 0 $ 0