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RELATED-PARTY TRANSACTIONS - Other Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 31, 2019
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 07, 2019
ft²
May 15, 2019
ft²
Oct. 01, 2015
C I M Management Entities Affiiate              
Related Party Transaction [Line Items]              
Lease renewal term             5 years
Revenue from related parties   $ 87 $ 112 $ 108      
Administrator              
Related Party Transaction [Line Items]              
Related party, shares acquired (in shares) | shares 2,468,390            
Related party, percentage of common stock outstanding 16.90%            
Related party, per share amount (in usd per share) | $ / shares $ 19.1685            
Employment Agreement | President              
Related Party Transaction [Line Items]              
Contractual obligation in connection with retirement of company president   450          
Employment Agreement | Affiliated Entity              
Related Party Transaction [Line Items]              
Due to related party   287          
Eleven year lease | CIM Group              
Related Party Transaction [Line Items]              
Revenue from related parties   $ 1,500 $ 932 $ 0      
Operating lease term           11 years  
Square feet | ft²         30,000 32,000