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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying value of goodwill for the year ended December 31, 2019 and 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
(585
)
Balance as of December 31, 2018
64,029

Adjustments 1
(105
)
Balance as of December 31, 2019
$
63,924



1  
Adjustments were related to foreign currency translation within the measurement period.
Schedule of Amortized Intangible Assets
Acquired intangible long-lived assets are being amortized as follows (in thousands):
 
Weighted Average Amortization Period (in years)
 
Gross Carrying Amount as of
December 31, 2019
 
Accumulated
Amortization
 
Accumulated Impairment Loss
 
Net Carrying
Value as of
December 31, 2019
Trademarks
15
 
$
7,100

 
$
(2,045
)
 
$
(4,179
)
 
$
876

Existing technology
13
 
12,600

 
(5,831
)
 
(4,328
)
 
2,441

Customer relationships
11
 
33,500

 
(18,405
)
 
(10,751
)
 
4,344

Reacquired rights
3
 
7,500

 
(7,059
)
 
—

 
441

Patents
8
 
6,796

 
(3,165
)
 
—

 
3,631

Other
2
 
618

 
(583
)
 
—

 
35

Total intangible assets
 
 
$
68,114

 
$
(37,088
)
 
$
(19,258
)
 
$
11,768

 
Weighted Average Amortization Period (in years)
 
Gross Carrying
Amount as of
December 31, 2018
 
Accumulated
Amortization
 
Accumulated Impairment Loss
 
Net Carrying
Value as of
December 31, 2018
Trademarks
15
 
$
7,100

 
$
(1,907
)
 
$
(4,179
)
 
$
1,014

Existing technology
13
 
12,600

 
(5,268
)
 
(4,328
)
 
3,004

Customer relationships
11
 
33,500

 
(16,542
)
 
(10,751
)
 
6,207

Reacquired rights
3
 
7,500

 
(4,341
)
 
—

 
3,159

Patents
8
 
6,796

 
(2,334
)
 
—

 
4,462

Other
2
 
618

 
(544
)
 
—

 
74

Total intangible assets
 
 
$
68,114

 
$
(30,936
)
 
$
(19,258
)
 
$
17,920
Schedule of Future Amortization for Finited-Lived Intangible Assets
The total estimated annual future amortization expense for these acquired intangible assets as of December 31, 2019 is as follows (in thousands):
Fiscal Year
 
Amortization
2020
 
$
3,845

2021
 
3,372

2022
 
2,116

2023
 
1,495

2024
 
555

Thereafter
 
385

Total
 
$
11,768