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Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Revenue From Contract With Customer [Abstract]    
Deferred revenue balance at December 31, 2020   $ 236,937
Additions to deferred revenue during the period   14,141
Revenue recognized during the period $ 40,600 (47,883)
Deferred revenue balance at June 30, 2021 $ 203,195 $ 203,195