Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Valuation allowance (decrease) increase $ 4.6 $ 3.7
Domestic Tax Authority    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforward 21.4  
R&D credit carryforwards 0.7  
Domestic Tax Authority | After 2017    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforward 14.2  
Domestic Tax Authority | Before 2018    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforward 7.2  
State and Local Jurisdiction | California Franchise Tax Board    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforward 16.9  
R&D credit carryforwards 0.4  
State and Local Jurisdiction | States Other than California    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforward $ 3.4