8. Goodwill and intangible assets

Goodwill

The following table sets forth the changes in our goodwill balance, for all periods presented:


	Goodwill
Balance, December 31, 2016 and December 31, 2017	$	42,403
Acquisition of Elauwit		17,237
Balance, December 31, 2018	$	59,640

Intangible assets

The following table sets forth the changes in our intangible assets balance, for all periods presented:


	Intangible
	Assets
Balance, December 31, 2016	$	13,783
Amortization expense		(3,520)
Balance, December 31, 2017		10,263
Additions		12,640
Amortization expense		(3,751)
Balance, December 31, 2018	$	19,152

Intangible assets at December 31, 2018 consist of the following:


	Historical		Accumulated
	Cost		Amortization		Net
Venue contracts	$	20,530	$	(13,829)	$	6,701
Backlog		7,030		(586)		6,444
Customer and partner relationships		3,780		(206)		3,574
Non-compete agreements, technology and other		5,084		(2,651)		2,433
	$	36,424	$	(17,272)	$	19,152

Intangible assets at December 31, 2017 consist of the following:


	Historical		Accumulated
	Cost		Amortization		Net
Venue contracts	$	22,061	$	(13,835)	$	8,226
Non-compete agreements, technology and other		6,844		(4,807)		2,037
	$	28,905	$	(18,642)	$	10,263

The decrease in our intangible assets cost and accumulated amortization balances from 2017 to 2018 is primarily related to the write-off of venue contract intangible assets that have expired.

Amortization expense for fiscal years 2019 through 2023 and thereafter is as follows:


	Amortization
Year	Expense
2019	$	4,435
2020		4,221
2021		3,494
2022		3,030
2023		1,863
Thereafter		2,109
	$	19,152