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CERTAIN BALANCE SHEET ACCOUNTS - Other Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Payables and Accruals [Abstract] |  |
Income taxes payable | $ 2,608 | $ 0
Accrued expenses and other | 3,948 | 1,105
Other accrued liabilities | $ 6,556 | $ 1,105

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