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CERTAIN BALANCE SHEET ACCOUNTS - Other Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Income taxes payable | $ 0 | $ 2,608
Accrued expenses and other | 1,380 | 3,948
Total | $ 1,380 | $ 6,556

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