(

)

GOODWILL AND INTANGIBLE ASSETS

Goodwill and intangible assets on our balance sheets are the result of our acquisitions of Sigma Systems Corp. ("Sigma") in

October 2008,

Thermonics, Inc. ("Thermonics") in

January 2012

and Ambrell in

May 2017.

All of our goodwill and intangible assets are allocated to our Thermal segment. Goodwill totaled

$13,738

at each of

March 31, 2019

and

December 31, 2018.

Intangible Assets

Changes in the amount of the carrying value of finite-lived intangible assets for the

three

months ended

March 31, 2019

are as follows:

Balance - January 1, 2019	$	8,201
Amortization		(317	)
Balance March 31, 2019	$	7,884

The following tables provide further detail about our intangible assets as of

March 31, 2019

and

December 31, 2018:

	March 31, 201 9
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	10,480	$	2,987	$	7,493
Technology		600		287		313
Patents		590		512		78
Software		270		270		-
Trade name		140		140		-
Customer backlog		500		500		-
Total finite-lived intangible assets		12,580		4,696		7,884
Indefinite-lived intangible assets:
Trademarks		6,710		-		6,710
Total intangible assets	$	19,290	$	4,696	$	14,594

	December 31, 201 8
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	10,480	$	2,717	$	7,763
Technology		600		250		350
Patents		590		502		88
Software		270		270		-
Trade name		140		140		-
Customer backlog		500		500		-
Total finite-lived intangible assets		12,580		4,379		8,201
Indefinite-lived intangible assets:
Trademarks		6,710		-		6,710
Total intangible assets	$	19,290	$	4,379	$	14,911

We generally amortize our finite-lived intangible assets over their estimated useful lives on a straight-line basis, unless an alternate amortization method can be reliably determined. Any such alternate amortization method would be based on the pattern in which the economic benefits of the intangible asset are expected to be consumed.

None

of our intangible assets have any residual value.

Total amortization expense for our finite-lived intangible assets was

$317

and

$216,

respectively, for the

three

months ended

March 31, 2019

and

2018.

The following table sets forth the estimated annual amortization expense for each of the next

five

years:

2019 (remainder)	$	940
2020	$	1,233
2021	$	1,227
2022	$	1,167
2023	$	1,067