Revenue and Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2014

Revenue and Accounts Receivable [Abstract]

Accounts Receivable Components

The components of accounts receivable are as follows (in thousands):

	December 31,
	2014			2013
Billed accounts receivable	$	15,447		$	29,492
Unbilled receivables		7,447			16,461
Allowance for doubtful accounts		(372	)		(321	)
	$	22,522		$	45,632

Allowance for Doubtful Accounts

The activities in the allowance for doubtful accounts are set forth below (in thousands):

	Balance Beginning of Year		Bad Debt Expenses (1)			Recoveries (2)			Balance End of Year
Year Ended December 31, 2014	$	321	$	51		$	--		$	372
Year Ended December 31, 2013	$	319	$	2		$	--		$	321
Year Ended December 31, 2012	$	375	$	(53	)	$	(3	)	$	319

(1)   Accounts receivable reserves and reversal of allowance for subsequent collections, net

(2)   Accounts receivable written-off and subsequent recoveries, net

Revenue by Customer Sector

We derived substantially all of our revenues from contracts and subcontracts with the U.S. Government. Revenue by customer sector for the last three fiscal years is as follows:

	2014				2013				2012
					(dollar amounts in thousands)
Federal	$	122,549	96.1	%	$	203,917	98.3	%	$	224,010	99.1	%
Commercial		5,013	3.9	%		3,477	1.7	%		2,086	0.9	%
Total	$	127,562	100.0	%	$	207,394	100.0	%	$	226,096	100.0	%