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Revenue and Related Contract Costs and Contract Liabilities - Summary of Changes in Contract Liabilities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2020 $ 18,618
Cash additions 117,499
Revenue recognized (90,638)
Foreign exchange translation adjustment (584)
Balance at September 30, 2021 $ 44,895