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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

The changes in the carrying amount of goodwill for the three months ended March 31, 2018 were as follows (in thousands):
 
TASER
Weapons
 
Software and Sensors
 
Total
Balance, beginning of period
$
1,453

 
$
13,474

 
$
14,927

Foreign currency translation adjustment
10

 
10

 
20

Balance, end of period
$
1,463

 
$
13,484

 
$
14,947



Intangible assets (other than goodwill) consisted of the following (in thousands):
 
 
 
March 31, 2018
 
December 31, 2017
 
Useful
Life
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortized:
 
 
 
 
 
 
 
 
 
 
 
 
 
Domain names
5-10 years
 
$
3,161

 
$
(504
)
 
$
2,657

 
$
3,161

 
$
(428
)
 
$
2,733

Issued patents
4-15 years
 
2,724

 
(959
)
 
1,765

 
2,697

 
(913
)
 
1,784

Issued trademarks
3-11 years
 
857

 
(416
)
 
441

 
860

 
(397
)
 
463

Customer relationships
4-8 years
 
1,396

 
(518
)
 
878

 
1,377

 
(451
)
 
926

Non-compete agreements
3-4 years
 
558

 
(376
)
 
182

 
556

 
(346
)
 
210

Developed technology
3-7 years
 
13,469

 
(4,723
)
 
8,746

 
13,469

 
(3,956
)
 
9,513

Re-acquired distribution rights
2 years
 
2,098

 
(1,049
)
 
1,049

 
2,133

 
(711
)
 
1,422

Total amortized
 
 
24,263

 
(8,545
)
 
15,718

 
24,253

 
(7,202
)
 
17,051

Not amortized:
 
 
 
 
 
 
 
 
 
 
 
 
 
TASER trademark
 
 
900

 
 
 
900

 
900

 
 
 
900

Patents and trademarks pending
 
 
878

 
 
 
878

 
872

 
 
 
872

Total not amortized
 
 
1,778

 
 
 
1,778

 
1,772

 
 
 
1,772

Total intangible assets
 
 
$
26,041

 
$
(8,545
)
 
$
17,496

 
$
26,025

 
$
(7,202
)
 
$
18,823


Amortization expense of intangible assets for the three months ended March 31, 2018 and 2017 was $1.4 million and $0.9 million, respectively. Estimated amortization for intangible assets with definite lives for the remaining nine months of 2018, the next five years ended December 31, and thereafter, is as follows (in thousands):
2018
$
4,047

2019
3,871

2020
2,404

2021
2,269

2022
838

2023
568

Thereafter
1,721

Total
$
15,718