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Revenue - Information about Receivables, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue From Contract With Customer [Abstract]    
Accounts receivable, net $ 124,146 $ 98,827
Contract assets 999 63
Unearned revenue 16,394 14,092
Non-current unearned revenue $ 7,426 $ 6,888