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REVENUE RECOGNITION - Schedule of Assets and Liabilities Associated with Contracts from Customers (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disaggregation Of Revenue [Line Items] |  |
Accounts receivable | $ 82,261 | $ 60,452
Short-term deferred revenue | 105,215 | 97,333
Long-term deferred revenue | 57,086 | $ 47,529
Other Current Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Short-term unbilled receivables | 6,659 |
Other Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Long-term unbilled receivables | $ 3,770 |

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