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Goodwill and Long-lived Assets
9 Months Ended
Sep. 30, 2018
Notes To Financial Statements [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill

The change in the carrying value of goodwill for the nine months ended September 30, 2018, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):
 
Total
Balance as of December 31, 2017
$
64,614

Adjustments 1
(542
)
Balance as of September 30, 2018
$
64,072


1 The adjustments to goodwill during the period were a result of foreign currency translation

During the fourth quarter of fiscal 2017, we performed the annual goodwill impairment testing and found no impairment as the fair value of our Clear Aligner reporting unit was significantly in excess of the carrying value.

Intangible Long-Lived Assets

Acquired intangible long-lived assets are being amortized as follows (in thousands): 
 
Weighted Average Amortization Period (in years)
 
Gross Carrying Amount as of
September 30, 2018
 
Accumulated
Amortization
 
Accumulated
Impairment Loss
 
Net Carrying
Value as of
September 30, 2018
Trademarks
15
 
$
7,100

 
$
(1,873
)
 
$
(4,179
)
 
$
1,048

Existing technology
13
 
12,600

 
(5,127
)
 
(4,328
)
 
3,145

Customer relationships
11
 
33,500

 
(16,078
)
 
(10,751
)
 
6,671

Reacquired rights
3
 
7,500

 
(3,604
)
 

 
3,896

Patents
8
 
6,796

 
(2,126
)
 

 
4,670

Other
2
 
618

 
(513
)
 

 
105

Total intangible assets
 
 
$
68,114

 
$
(29,321
)
 
$
(19,258
)
 
$
19,535


 
Weighted Average Amortization Period (in years)
 
Gross Carrying
Amount as of
December 31, 2017
 
Accumulated
Amortization
 
Accumulated Impairment Loss
 
Net Carrying
Value as of
December 31, 2017
Trademarks
15
 
$
7,100

 
$
(1,769
)
 
$
(4,179
)
 
$
1,152

Existing technology
13
 
12,600

 
(4,704
)
 
(4,328
)
 
3,568

Customer relationships
11
 
33,500

 
(14,681
)
 
(10,751
)
 
8,068

Reacquired rights
3
 
7,500

 
(1,356
)
 

 
6,144

Patents
8
 
6,798

 
(1,504
)
 

 
5,294

Other
2
 
618

 
(390
)
 

 
228

Total intangible assets
 
 
$
68,116

 
$
(24,404
)
 
$
(19,258
)
 
$
24,454



The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2018 is as follows (in thousands):
Fiscal Year Ending December 31,

 
Amortization
Remainder of 2018
 
$
1,571

2019
 
6,171

2020
 
3,854

2021
 
3,388

2022
 
2,116

Thereafter
 
2,435

Total
 
$
19,535



Amortization for both the three months ended September 30, 2018 and 2017 was $1.5 million and amortization for the nine months ended September 30, 2018 and 2017 was $4.5 million and $4.7 million, respectively.