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Contracts with Customers - Summary of Changes in Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue From Contract With Customer [Abstract]    
Acquired contract assets $ 5,979 $ 8,350
Acquired contract liabilities $ 320 $ 300