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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2019 were as follows (in thousands):
 
TASER
 
Software and Sensors
 
Total
Balance, beginning of period
$
1,338

 
$
23,643

 
$
24,981

Foreign currency translation adjustment
(6
)
 
(6
)
 
(12
)
Balance, end of period
$
1,332

 
$
23,637

 
$
24,969



Intangible assets (other than goodwill) consisted of the following (in thousands):
 
 
 
June 30, 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

 
$
(884
)
 
$
2,277

 
$
3,161

 
$
(732
)
 
$
2,429

Issued patents
4-15 years
 
2,993

 
(1,212
)
 
1,781

 
2,940

 
(1,106
)
 
1,834

Issued trademarks
3-11 years
 
969

 
(511
)
 
458

 
1,053

 
(599
)
 
454

Customer relationships
4-8 years
 
3,697

 
(1,155
)
 
2,542

 
3,701

 
(880
)
 
2,821

Non-compete agreements
3-4 years
 
450

 
(394
)
 
56

 
540

 
(439
)
 
101

Developed technology
3-7 years
 
10,660

 
(5,435
)
 
5,225

 
13,404

 
(7,081
)
 
6,323

Re-acquired distribution rights
2 years
 
2,006

 
(2,006
)
 
—

 
1,928

 
(1,813
)
 
115

Total amortizable
 
 
23,936

 
(11,597
)
 
12,339

 
26,727

 
(12,650
)
 
14,077

Not amortizable (indefinite-lived) intangible assets:
 
 
 
 
 
 
 
 
 
 
TASER trademark
 
 
900

 
 
 
900

 
900

 
 
 
900

Patents and trademarks pending
 
 
1,185

 
 
 
1,185

 
958

 
 
 
958

Total not amortizable
 
 
2,085

 
 
 
2,085

 
1,858

 
 
 
1,858

Total intangible assets
 
 
$
26,021

 
$
(11,597
)
 
$
14,424

 
$
28,585

 
$
(12,650
)
 
$
15,935


Amortization expense of intangible assets for the three and six months ended June 30, 2019 was $0.9 million and $1.9 million, respectively. Amortization expense of intangible assets for the three and six months ended June 30, 2018 was $1.7 million and $3.0 million, respectively. Estimated amortization for intangible assets with definite lives for the remaining six months of 2019, the next five years ended December 31, and thereafter, is as follows (in thousands):
2019 Remaining
$
1,653

2020
3,300

2021
2,852

2022
1,251

2023
954

2024
872

Thereafter
1,457

Total
$
12,339