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Revenue - Schedule of Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Deferred revenue, beginning of the period $ 1,126 $ 274 $ 1,105 $ 137
Deferred revenue, end of the period 1,269 1,010 1,269 1,010
Change in deferred revenue during the period $ 143 $ 736 $ 164 $ 873