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Revenue and Deferred Revenue - Schedule of changes in the deferred revenue balance (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Movement in Deferred Revenue [Roll Forward]    
Deferred revenue, beginning of period $ 26,276 $ 14,566
Recognition of revenue included in beginning of period deferred revenue (21,910) (12,227)
Revenue deferred, net of revenue recognized on contracts in the respective period 25,475 17,552
Deferred revenue, end of period $ 29,841 $ 19,891