Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION (Details)

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REVENUE RECOGNITION (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
REVENUE RECOGNITION    
Contract liabilities, current $ 9,044 $ 6,485
Revenue recognized from amounts included in contract liabilities $ 4,785 $ 4,785