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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Recurring (Details) - Recurring basis - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair value measurements    
Total assets and liabilities measured at fair value $ (18,761) $ 16,365
Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 380
Money market funds    
Fair value measurements    
Cash and cash equivalents 3,158 2,785
Short Term Investments    
Fair value measurements    
Investments 434  
Other investments    
Fair value measurements    
Investments 1,953 13,357
Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Warrant    
Fair value measurements    
Derivative liabilities (559)  
Interest rate swap    
Fair value measurements    
Derivative liabilities (1,487) (157)
Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 3,592 2,785
Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 3,158 2,785
Level 1 | Short Term Investments    
Fair value measurements    
Investments 434  
Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value (1,107) 223
Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 380
Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities (1,487) (157)
Level 3    
Fair value measurements    
Total assets and liabilities measured at fair value (21,246) 13,357
Level 3 | Other investments    
Fair value measurements    
Investments 1,953 $ 13,357
Level 3 | Redeemable common units    
Fair value measurements    
Derivative liabilities (22,640)  
Level 3 | Warrant    
Fair value measurements    
Derivative liabilities $ (559)