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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Notes To Financial Statements [Abstract]  
Summary of Goodwill by Reportable Segment
The change in the carrying value of goodwill for the six months ended June 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
(434
)
Balance as of June 30, 2018
$
64,180


1 The adjustments to goodwill during the period were a result of foreign currency translation.
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
June 30, 2018
 
Accumulated
Amortization
 
Accumulated
Impairment Loss
 
Net Carrying
Value as of
June 30, 2018
Trademarks
15
 
$
7,100

 
$
(1,838
)
 
$
(4,179
)
 
$
1,083

Existing technology
13
 
12,600

 
(4,986
)
 
(4,328
)
 
3,286

Customer relationships
11
 
33,500

 
(15,612
)
 
(10,751
)
 
7,137

Reacquired rights
3
 
7,500

 
(2,894
)
 
—

 
4,606

Patents
8
 
6,796

 
(1,919
)
 
—

 
4,877

Other
2
 
618

 
(480
)
 
—

 
138

Total intangible assets
 
 
$
68,114

 
$
(27,729
)
 
$
(19,258
)
 
$
21,127


 
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 Finite-Lived Intangible Assets, Future Amortization Expense
The total estimated annual future amortization expense for these acquired intangible assets as of June 30, 2018 is as follows (in thousands):
Fiscal Year Ending December 31,

 
Amortization
Remainder of 2018
 
$
3,149

2019
 
6,184

2020
 
3,855

2021
 
3,389

2022
 
2,116

Thereafter
 
2,434

Total
 
$
21,127