Contract Assets and Contract Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The balance of contract assets and contract liabilities consisted of the following (in thousands):

	June 30, 2018		December 31, 2017
Contract assets
Current	$	673	$	325
Contract Liabilities
Current	$	4,538	$	2,252
Non-current	4,664		4,442
	$	9,202	$	6,694

	June 30, 2018
Estimate of when contract liabilities will be recognized
within 12 months	$	4,538
within 12 to 24 months	3,988
greater than 24 months	676