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Basis of Presentation and Significant Accounting Policies - Summary of Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Receivables, which are included in "Trade accounts receivable" $ 8,002  
Contract assets, which are included in "Prepaid and other current assets" 0 $ 19,000
Contract liabilities, which are included in "Deferred revenue" $ 5,414 $ 5,496