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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The changes in the carrying amount of goodwill for the year ended December 31, 2019 were as follows (in thousands):
 
TASER
 
Software and
Sensors
 
Total
Balance, December 31, 2018
$
1,338

 
$
23,643

 
$
24,981

Foreign currency translation adjustments
16

 
16

 
32

Balance, December 31, 2019
$
1,354

 
$
23,659

 
$
25,013


Intangible assets (other than goodwill) consisted of the following (in thousands):
 
 
 
December 31, 2019
 
December 31, 2018
 
Useful
Life
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortizable (definite-lived) intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Domain names
5-10 years
 
$
3,161

 
$
(1,035
)
 
$
2,126

 
$
3,161

 
$
(732
)
 
$
2,429

Issued patents
5-25 years
 
3,271

 
(1,339
)
 
1,932

 
2,940

 
(1,106
)
 
1,834

Issued trademarks
3-15 years
 
1,166

 
(678
)
 
488

 
1,053

 
(599
)
 
454

Customer relationships
4-8 years
 
3,721

 
(1,416
)
 
2,305

 
3,701

 
(880
)
 
2,821

Non-compete agreements
3-4 years
 
450

 
(404
)
 
46

 
540

 
(439
)
 
101

Developed technology
3-5 years
 
10,660

 
(6,528
)
 
4,132

 
13,404

 
(7,081
)
 
6,323

Re-acquired distribution rights
2 years
 
2,009

 
(2,009
)
 
—

 
1,928

 
(1,813
)
 
115

Total amortizable
 
 
24,438

 
(13,409
)
 
11,029

 
26,727

 
(12,650
)
 
14,077

Non-amortizable (indefinite-lived) intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
TASER trademark
 
 
900

 
 
 
900

 
900

 
 
 
900

Patents and trademarks pending
 
 
842

 
 
 
842

 
958

 
 
 
958

Total non-amortizable
 
 
1,742

 
 
 
1,742

 
1,858

 
 
 
1,858

Total intangible assets
 
 
$
26,180

 
$
(13,409
)
 
$
12,771

 
$
28,585

 
$
(12,650
)
 
$
15,935


Amortization expense of intangible assets was $3.5 million, $5.7 million and $4.7 million for the years ended December 31, 2019, 2018 and 2017, respectively. Estimated amortization for intangible assets with definitive lives for the next five years ended December 31, and thereafter, is as follows (in thousands):
2020
$
3,316

2021
2,868

2022
1,266

2023
971

2024
887

Thereafter
1,721

Total
$
11,029