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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying value of goodwill for the year ended December 31, 2017, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):
 
Total
Balance as of December 31, 2015
$
61,074

Adjustments (1)
(30
)
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


(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, 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 rights1
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


 
Weighted Average Amortization Period (in years)
 
Gross Carrying
Amount as of
December 31, 2016
 
Accumulated
Amortization
 
Accumulated Impairment Loss
 
Net Carrying
Value as of
December 31, 2016
Trademarks
15
 
$
7,100

 
$
(1,631
)
 
$
(4,179
)
 
$
1,290

Existing technology
13
 
12,600

 
(4,141
)
 
(4,328
)
 
4,131

Customer relationships
11
 
33,500

 
(12,819
)
 
(10,751
)
 
9,930

Patents
8
 
6,316

 
(713
)
 
—

 
5,603

Total intangible assets
 
 
$
59,516

 
$
(19,304
)
 
$
(19,258
)
 
$
20,954



1 The fair value of reacquired rights obtained from distributor acquisitions during the first quarter of fiscal year 2017 is valued using the income approach. In addition, we effectively settled the pre-existing relationship with the distributors by assessing whether the distributor agreements include favorable or unfavorable terms compared to current market rates. Based on the assessment, we determined that the distributor agreements had terms that are consistent with market rates and, therefore, no settlement gains or losses are recorded associated with the acquisition.
Schedule of Future Amortization for Finited-Lived Intangible Assets
The total estimated future amortization expense for these acquired intangible assets as of December 31, 2017 is as follows (in thousands):
Fiscal Year
 
2018
$
6,379

2019
6,265

2020
3,869

2021
3,389

2022
2,116

Thereafter
2,436

Total
$
24,454