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SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, Major Customer [Line Items]      
Revenue $ 3,184,000 $ 1,658,000 $ 5,865,000
Contract with Customer, Liability 0 0 0
Sales Revenue, Net | Customer Concentration Risk | Customer 1      
Revenue, Major Customer [Line Items]      
Revenue 1,570,000 1,550,000 2,720,000
Sales Revenue, Net | Customer Concentration Risk | Customer 2      
Revenue, Major Customer [Line Items]      
Revenue 1,390,000   770,000
Sales Revenue, Net | Customer Concentration Risk | Customer 3      
Revenue, Major Customer [Line Items]      
Revenue     750,000
Sales Revenue, Net | Customer Concentration Risk | Customer 4      
Revenue, Major Customer [Line Items]      
Revenue     740,000
Sales Revenue, Net | United States | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 1,720,000 1,660,000 5,800,000
Sales Revenue, Net | Other | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 80,000.00   $ 70,000.00
Sales Revenue, Net | ESTONIA | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 1,390,000    
Accounts Receivable Benchmark | Customer Concentration Risk | Customer 1      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 1,390,000 350,000  
Accounts Receivable Benchmark | Customer Concentration Risk | Customer 2      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 370,000    
Accounts Receivable Benchmark | United States | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 470,000 $ 390,000  
Accounts Receivable Benchmark | ESTONIA | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss $ 1,390,000