Quarterly report pursuant to Section 13 or 15(d)

Revenue - Changes in Deferred Revenue (Details)

v3.21.2
Revenue - Changes in Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Change in Contract with Customer, Liability [Roll Forward]    
Beginning balance $ 101,542 $ 121,339
Deferral of revenue 131,895 103,542
Recognition of deferred revenue (105,590) (121,273)
Ending balance $ 127,847 $ 103,608