Contract Assets and Contract Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

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

	March 31, 2018		December 31, 2017
Contract assets
Current	$	414	$	325
Contract Liabilities
Current	$	3,923	$	2,252
Non-current	5,474		4,442

	March 31, 2018
Estimate of when contract liabilities will be recognized
within 12 months	$	3,923
within 12 to 24 months	4,509
greater than 24 months	965