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Revenue Recognition - Changes in Balance of Deferred Revenues (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Revenue Recognition  
Balance $ 79,824
Increase in deferred revenues 2,397
Reclasses from deferred revenues to other short-term liabilities (799)
Revenue recognized during the period that was included in deferred revenues at the beginning of the period (7,246)
Revenue recognized from performance obligations satisfied within the same period (1,246)
Balance $ 72,930