Contract Receivables (Tables)

3 Months Ended

Mar. 31, 2018

Contract Receivables [Abstract]

Components of Contract Receivables

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