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FINANCING RECEIVABLES - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Less: allowance for expected credit losses $ (879) $ (722) $ (1,489)
Total financing receivables 11,752 13,719  
Long-Term Financing Arrangement      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
2022 4,837    
2023 4,658    
2024 2,729    
2025 1,309    
2026 153    
Thereafter 18    
Total minimum payments to be received 13,704    
Less: allowance for expected credit losses (875) (716)  
Less: unearned income (1,147) (1,339)  
Total financing receivables $ 11,682 $ 13,604