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Revenue Recognition - Schedule of Performance Obligations (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Revenue, Remaining Performance Obligation [Roll Forward]    
Beginning balance $ 11,082 $ 12,486
Acquired deferred revenue 11,125 0
Recognition of deferred revenue (15,846) (9,922)
Deferral of revenue 14,257 8,881
Ending balance $ 20,618 $ 11,445