Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table is a summary of unbilled receivables (in thousands):

	December 31,
	2019		2018
New Venture	$	5,222	$	38,430
Imaging Services	6,539		5,075
Devices	54		527
Total	$	11,815	$	44,032

The changes in unbilled receivables were as follows (in thousands):

Unbilled receivables at December 31, 2018	$	44,032
Recognition of unbilled receivables	166,878
Revenues billed to customers	(199,095		)
Unbilled receivables at December 31, 2019	$	11,815

The following table is a summary of deferred revenues (in thousands):

	December 31,
	2019		2018
New Venture	$	1,956	$	5,797
Imaging Services	1,501		307
Devices	452		626
Optimization Software & Services	642		980
Total	$	4,551	$	7,710

The changes in deferred revenues were as follows (in thousands):

Deferred revenue at December 31, 2018	$	7,710
Cash collected in excess of revenue recognized	4,642
Recognition of deferred revenue (a)	(7,801		)
Deferred revenue at December 31, 2019	$	4,551

^(a)    The majority of deferred revenue recognized relates to Company’s Ventures group.