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Trade Accounts Receivable - Summary of Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounts Receivable Net Current [Abstract]    
Trade accounts receivable $ 3,601 $ 4,036
Allowance for doubtful accounts (25) (15)
Trade accounts receivable, net 3,576 4,021
Unpaid deferred revenue included in trade accounts receivable $ 856 $ 2,015