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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenue (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred revenue, current | $ 1,372 | $ 99
Deferred revenue, net of current portion | 5,398 | 5,886
Contract with Customer, Liability, Total | 6,770 | 5,985
Other accrued liabilities |  |
Deferred revenue, current | $ 1,372 | $ 99

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