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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying value of goodwill for the year ended December 31, 2018, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):
 
Total
Balance as of December 31, 2016
$
61,044

Goodwill from distributor acquisitions
3,247

Adjustments (1)
323

Balance as of December 31, 2017
64,614

Adjustments (1)
(585
)
Balance as of December 31, 2018
$
64,029


(1) The adjustments to goodwill during the period were related to foreign currency translation and/or purchase accounting adjustments 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, 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

 
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
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, 2018 is as follows (in thousands):
Fiscal Year
 
Amortization
2019
 
$
6,134

2020
 
3,847

2021
 
3,389

2022
 
2,116

2023
 
1,495

Thereafter
 
939

Total
 
$
17,920