Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2013

Accounts Receivable, Net [Abstract]

Accounts Receivable

Accounts receivable represent amounts billed and currently due from customers and consisted of the following:

December 31	2012		2013
Non-U.S. government	$	2,728	$	2,767
U.S. government	778		951
Commercial	698		684
Total accounts receivable	$	4,204	$	4,402