Contract Receivables

12 Months Ended

Dec. 31, 2016

Contract Receivables [Abstract]

Contract Receivables

3.  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. Recoverable costs and accrued profit not billed 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)	December 31,
	2016			2015
Billed receivables	$	13,325		$	9,831
Recoverable costs and accrued profit not yet billed		5,555			3,325
Allowance for doubtful accounts		(17	)		(103	)
Total contract receivables, net	$	18,863		$	13,053