Revenue and Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2013

Revenue and Accounts Receivable [Abstract]

Accounts Receivable Components

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

	December 31,
	2013			2012
Billed accounts receivable	$	29,492		$	21,476
Unbilled receivables		16,461			12,722
Allowance for doubtful accounts		(321	)		(319	)
	$	45,632		$	33,879

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)			Deductions (2)			Balance End of Year
Year ended December 31, 2013	$	319	$	2		$	----		$	321
Year ended December 31, 2012	$	375	$	(53	)	$	(3	)	$	319
Year ended December 31, 2011	$	358	$	17		$	----		$	375

(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:

	2013				2012				2011
	(dollar amounts in thousands)
Federal	$	203,917	98.3	%	$	224,010	99.1	%	$	188,162	99.1	%
Commercial		3,477	1.7	%		2,086	0.9	%		1,726	0.9	%
Total	$	207,394	100.0	%	$	226,096	100.0	%	$	189,888	100.0	%