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INCOME TAXES - Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Valuation Allowance $ 0 $ 0
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 12,500  
CALIFORNIA    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 9,900  
COLORADO    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local $ 3,200  
California Franchise Tax Board [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Limitations on Use The amount of the annual limitations for Federal and California Franchise Tax purpose is $1.3 million and if not fully utilized, the NOLs will begin to expire in 2028.  
Operating Loss Carryforwards, Limitations on Use, Amount $ 1,300