Trade Accounts Receivable and Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Summary of Trade Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount.

	December 31,			December 31,
	2016			2015
Trade accounts receivable	$	5,093		$	4,631
Allowance for doubtful accounts		(15	)		(15	)
Trade accounts receivable, net	$	5,078		$	4,616
Unpaid deferred revenue included in trade accounts    receivable	$	2,245		$	2,012

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

Customers who accounted for 10% or more of trade accounts receivable, net are as follows:

	December 31,			December 31,
	2016			2015
Central Banks		57	%		62	%