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BUSINESS AND BASIS OF PRESENTATION - Narrative (Details) - USD ($)
$ in Thousands
Jun. 12, 2020
Dec. 31, 2020
GKCE acquisition    
Asset acquisition, percentage of shares acquired 98.00% 99.30%
Asset acquisition, percentage of shares remaining 0.70%  
Base purchase consideration $ 2,000  
Payments for asset acquisitions 575  
Asset acquisition, transaction costs $ 1,425  
OR21 LLC    
Equity method investment, ownership percentage   50.00%
Architectural Design Company    
Equity method investment, ownership percentage   50.00%