Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

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

	December 31,
	2018		2017
New Venture	$	5,797	$	6,548
Imaging Services	307		676
Devices	626		633
Optimization Software & Services	980		1,053
Total	$	7,710	$	8,910

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

Deferred revenue at December 31, 2017	$	8,910
Cash collected in excess of revenue recognized	25,234
Recognition of deferred revenue (a)	(26,434		)
Deferred revenue at December 31, 2018	$	7,710

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

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

	December 31,
	2018		2017
New Venture	$	38,430	$	33,183
Imaging Services	5,075		4,121
Devices	527		—
Total	$	44,032	$	37,304

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

Unbilled receivables at December 31, 2017	$	37,304
Recognition of unbilled receivables	153,611
Revenues billed to customers	(146,883		)
Unbilled receivables at December 31, 2018	$	44,032