Contract assets as of September 30, 2019 and December 31, 2018 were $3,405 and $3,624, respectively, and included in other current assets

A rollforward of the Company’s deferred revenue and customer advances is as follows:


	Nine Months Ended September 30, 2019
Beginning balance, January 1 (1)	$	17,474
Deferred revenue and customer advances assumed in ESI Merger		4,629
Additions to deferred revenue and customer advances		41,922
Amount of deferred revenue and customer advances recognized in income		(38,787	)

Ending balance, September 30 (2)	$	25,238

(1)

Beginning deferred revenue and customer advances as of January 1, 2019 included $

8,134

of current deferred revenue, $

3,228

of long-term deferred revenue and $

6,112

of current customer advances.

(2)

Ending deferred revenue as of September 30, 2019 included $

14,161

of current deferred revenue, $

2,874

of long-term deferred revenue and $

8,202

of current customer advances.

Disaggregation of Revenue

The following table summarizes revenue from contracts with customers:


	Three Months Ended September 30, 2019
	Vacuum & Analysis		Light & Motion		Equipment & Solutions		Total
Net revenues:
Products	$	197,203	$	156,436	$	32,534	$	386,173
Services		43,478		16,024		16,776		76,278

Total net revenues	$	240,681	$	172,460	$	49,310	$	462,451


	Three Months Ended September 30, 201 8
	Vacuum & Analysis		Light & Motion		Equipment & Solutions		Total
Net revenues:
Products	$	239,924	$	186,331	$	—	$	426,255
Services		46,114		14,783		—		60,897

Total net revenues	$	286,038	$	201,114	$	—	$	487,152


	Nine Months Ended September 30, 2019
	Vacuum & Analysis		Light & Motion		Equipment & Solutions		Total
Net revenues:
Products	$	581,611	$	502,496	$	100,755	$	1,184,862
Services		129,080		46,531		39,649		215,260

Total net revenues	$	710,691	$	549,027	$	140,404	$	1,400,122


	Nine Months Ended September 30, 2018
	Vacuum & Analysis		Light & Motion		Equipment & Solutions		Total
Net revenues:
Products	$	865,714		567,217	$	—	$	1,432,931
Services		136,996		44,640		—		181,636

Total net revenues	$	1,002,710	$	611,857	$	—	$	1,614,567

Product revenue, excluding revenue from certain custom products, is recorded at a point in time, while the majority of the service revenue and revenue from certain custom products is recorded over time.

Refer to Note 17 for revenue by reportable segment, geography and groupings of similar products.