Goodwill and intangible assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and intangible assets

Schedule of changes in goodwill

	Goodwill
Balance, December 31, 2012	$	26,744
Acquisition of Endeka		5,776
Acquisition of AWG		9,883
Balance, December 31, 2013 and December 31, 2014	$	42,403

Schedule of changes in intangible assets

	Intangible Assets
Balance, December 31, 2012	$	10,594
Additions		15,069
Amortization expense		(2,250	)
Balance, December 31, 2013		23,413
Amortization expense		(3,682	)
Impairment loss		(55	)
Balance, December 31, 2014	$	19,676

Schedule of intangible assets

        Intangible assets at December 31, 2014 consist of the following:

	Weighted Average Life	Historical Cost		Accumulated Amortization			Net
Venue contracts	10 years	$	36,356	$	(21,582	)	$	14,774
Non-compete agreements	5 years		3,840		(1,067	)		2,773
Technology	6 years		2,300		(863	)		1,437
Advertiser relationships	5 years		70		(34	)		36
Patents, trademarks and other	6 years		1,353		(697	)		656
		$	43,919	$	(24,243	)	$	19,676

        Intangible assets at December 31, 2013 consist of the following:

	Weighted Average Life	Historical Cost		Accumulated Amortization			Net
Venue contracts	10 years	$	36,356	$	(19,314	)	$	17,042
Non-compete agreements	5 years		3,840		(224	)		3,616
Technology	6 years		2,300		(441	)		1,859
Advertiser relationships	5 years		70		(20	)		50
Patents, trademarks and other	6 years		1,408		(562	)		846
		$	43,974	$	(20,561	)	$	23,413

Schedule of amortization expense for fiscal years 2015 through 2019 and thereafter

Year	Amortization Expense
2015	$	3,525
2016		3,451
2017		3,218
2018		2,370
2019		1,625
Thereafter		5,487
	$	19,676