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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, 2020
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2019 $ 28,496
Additions 16,710
Expenses (22,774)
Cancelled (9,840)
Foreign exchange translation adjustment (479)
Balance at September 30, 2020 $ 12,113