Contract Receivables

3 Months Ended

Mar. 31, 2018

Contract Receivables [Abstract]

Contract Receivables

7. Contract Receivables

Contract receivables represent the Company's unconditional rights to considerations due from a broad base of both domestic and international customers. All contract receivables are considered to be collectible within twelve months.

The components of contract receivables are as follows:

(in thousands)	March 31,		December 31,
	2018		2017
Billed receivables	$	10,823	$	8,154
Unbilled receivables		8,071		5,980
Allowance for doubtful accounts		(137)		(137)
Total contract receivables, net	$	18,757	$	13,997

During April 2018, the Company invoiced $2.8 million of the unbilled amounts related to the balance at March 31, 2018.

As of March 31, 2018 and December 31, 2017, the Company had one customer that accounted for 25.8% and 26.7%, respectively, of its consolidated contract receivables.