Contract Receivables

3 Months Ended

Mar. 31, 2016

Contract Receivables [Abstract]

Contract Receivables

5. Contract Receivables

Contract receivables represent balances due from a broad base of both domestic and international customers.  All contract receivables are considered to be collectible within twelve months.  Unbilled receivables represent costs incurred and associated profit accrued on contracts that will become billable upon future milestones or completion of contracts.

The components of contract receivables are as follows:

(in thousands)	March 31,			December 31,
	2016			2015
Billed receivables	$	7,631		$	9,831
Unbilled receivables		5,171			3,325
Allowance for doubtful accounts		(22	)		(103	)
Total contract receivables, net	$	12,780		$	13,053

Unbilled receivables totaled $5.2 million and $3.3 million as of March 31, 2016 and December 31, 2015, respectively.  During April 2016, the Company invoiced $1.8 million of the unbilled amounts related to March 31, 2016.

As of both March 31, 2016 and December 31, 2015, the Company did not have any customers that accounted for more than 10% of the Company's consolidated contract receivables.