Note

– Goodwill and Other Intangible Assets

The changes in the carrying amount of goodwill for the years ended

December 31, 2018

and

2017

were as follows:


(in thousands)	Dec. 31, 2016		Goodwill acquired during 2017		Dec. 31, 2017		Goodwill acquired during 2018		Dec. 31, 2018

United States	$	24,047	$	99,588	$	123,635	$	248	$	123,883
Europe		4,239		-		4,239		-		4,239
Japan		630		-		630		-		630
Total goodwill	$	28,916	$	99,588	$	128,504	$	248	$	128,752

As described in Note

– Business Combinations, the Company acquired RAPID in

November 2017.

The fair value of the consideration paid exceeded the fair value of the assets acquired and liabilities assumed, which resulted in goodwill in the United States of

$99.6

million for the year ended

December 31, 2017

and a related working capital adjustment of

$0.2

million for the year ended

December 31, 2018.

Intangible assets other than goodwill for the years ended

December 31, 2018

and

2017

were as follows:


	Year Ended December 31, 2018							Year Ended December 31, 2017								Weighted Average Useful Life
(in thousands)	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net		Useful Life (in years)	Remaining (in years)
Intangible Assets with finite lives:
Marketing assets	$	930	$	(434	)	$	496	$	930	$	(341	)	$	589	10.0	5.3
Non-compete agreement		270		(206	)		64		270		(190	)		80	2.0 - 5.0	4.0
Trade secrets		250		(233	)		17		250		(183	)		67	5.0	0.3
Trade names		1,080		(540	)		540		1,080		-			1,080	2.0	1.0
Software technology		12,229		(997	)		11,232		8,229		-			8,229	10.0	9.0
Customer relationships		10,070		(2,569	)		7,501		10,070		(1,031	)		9,039	6.0 - 9.0	4.8
Total intangible assets	$	24,829	$	(4,979	)	$	19,850	$	20,829	$	(1,745	)	$	19,084

Amortization expense for intangible assets for the years ended

December 31, 2018,

2017

and

2016

was

$3.2

million,

$0.5

million and

$0.7

million, respectively.

The Company acquired a software company in

December 2017,

which was accounted for as an asset acquisition and resulted in an

$8.2

million software technology intangible asset for the year ended

December 31, 2017.

The acquisition did

not

meet the definition of a business under ASC

805.

The asset acquisition included an additional

$5.0

million in contingent consideration to be recognized and paid upon completion of certain milestones over a

-month period. The completion of each milestone will result in additional value to the software technology intangible asset. We recognized

$4.0

million of the contingent consideration for the year ended

December 31, 2018.

We did

not

recognize any of the contingent consideration for the year ended

December 31, 2017

as the contingency was

not

resolved.

Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows:


(in thousands)	Estimated Amortization Expense
2019	$	3,451
2020		2,895
2021		2,895
2022		2,895
2023		2,691
Thereafter		5,023
Total estimated amortization expense	$	19,850