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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments - Recurring (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair value measurements    
Total assets and liabilities measured at fair value $ 16,365 $ 15,769
Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 380
Money market funds    
Fair value measurements    
Cash and cash equivalents 2,785 2,329
Short Term Investments    
Fair value measurements    
Investments   416
Other investments    
Fair value measurements    
Investments 13,357 12,700
Interest rate swap    
Fair value measurements    
Derivative liabilities (157) (56)
Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 2,785 2,745
Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,785 2,329
Level 1 | Short Term Investments    
Fair value measurements    
Investments   416
Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value 223 324
Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 380
Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities (157) (56)
Level 3    
Fair value measurements    
Total assets and liabilities measured at fair value 13,357 12,700
Level 3 | Other investments    
Fair value measurements    
Investments $ 13,357 $ 12,700