Trade Accounts Receivable - Summary of Trade Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable Net Current [Abstract]
Trade accounts receivable	$ 3,984	$ 4,036
Allowance for doubtful accounts	(25)	(15)
Trade accounts receivable, net	3,959	4,021
Unpaid deferred revenue included in trade accounts receivable	$ 909	$ 2,015

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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