Trade Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2020

Receivables [Abstract]

Summary of Trade Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount.

	March 31,			December 31,
	2020			2019
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

Customers Accounted for 10% or More of Trade Accounts Receivable, Net

The following customers accounted for 10% or more of trade accounts receivable, net:

	March 31,			December 31,
	2020			2019
Central Banks		66	%		69	%