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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments - Recurring (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair value measurements    
Total assets and liabilities measured at fair value $ (18,567) $ 16,365
Certificate of deposit    
Fair value measurements    
Cash and cash equivalents   380
Money market funds    
Fair value measurements    
Cash and cash equivalents 3,301 2,785
Short Term Investments    
Fair value measurements    
Investments 300  
Other investments    
Fair value measurements    
Investments 1,925 13,357
Interest rate derivative    
Fair value measurements    
Derivative liabilities (894) (157)
Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Warrant    
Fair value measurements    
Derivative liabilities (559)  
Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 3,601 2,785
Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 3,301 2,785
Level 1 | Short Term Investments    
Fair value measurements    
Investments 300  
Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value (894) 223
Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents   380
Level 2 | Interest rate derivative    
Fair value measurements    
Derivative liabilities (894) (157)
Level 3    
Fair value measurements    
Total assets and liabilities measured at fair value (21,274) 13,357
Level 3 | Other investments    
Fair value measurements    
Investments 1,925 $ 13,357
Level 3 | Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Level 3 | Warrant    
Fair value measurements    
Derivative liabilities $ (559)