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OTHER NON-CURRENT LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Other Liabilities Disclosure [Abstract] |
Schedule of other non-current liabilities | Other non-current liabilities consist of the following as of December 31:
(in thousands) |  | 2021 |  | 2020
Operating lease liabilities |  | $ | 5,029 |  |  | $ | 12,281 |
Income tax liabilities |  | 14,156 |  |  | 12,414 |
Deferred revenue |  | — |  |  | 504 |
Other non-current liabilities |  | 81 |  |  | 40 |
Total |  | $ | 19,266 |  |  | $ | 25,239 |

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