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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Recurring (Details) - Recurring basis - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value measurements |  |
Total assets and liabilities measured at fair value | $ 5,433 | $ 16,365
Certificate of deposit |  |
Fair value measurements |  |
Cash and cash equivalents | 380 | 380
Money market funds |  |
Fair value measurements |  |
Cash and cash equivalents | 3,134 | 2,785
Other investments |  |
Fair value measurements |  |
Investments | 2,016 | 13,357
Interest rate swap |  |
Fair value measurements |  |
Derivative liabilities | (97) | (157)
Level 1 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 3,134 | 2,785
Level 1 | Money market funds |  |
Fair value measurements |  |
Cash and cash equivalents | 3,134 | 2,785
Level 2 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 283 | 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 | (97) | (157)
Level 3 |  |
Fair value measurements |  |
Total assets and liabilities measured at fair value | 2,016 | 13,357
Level 3 | Other investments |  |
Fair value measurements |  |
Investments | $ 2,016 | $ 13,357

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