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Revenue and Related Contract Costs and Contract Liabilities - Summary of Changes in Contract Costs (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2020 $ 10,835
Additions 24,514
Expenses (14,061)
Cancelled (709)
Foreign exchange translation adjustment (57)
Balance at September 30, 2021 $ 20,522