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Intangible Assets (Tables)
 12 Months Ended
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible Assets
Intangible assets, net consist of the following (in thousands):
 
December 30,
2017
 
December 31,
2016
Cost
 
 
 
Patents
$
20,623

 
$
19,950

Customer relationships
7,669

 
7,669

Licenses
7,500

 
7,500

Acquired technology
5,580

 
5,580

Trademarks
4,036

 
3,777

Capitalized software development costs
2,699

 
2,539

Other
3,691

 
3,674

Total cost
51,798

 
50,689

Accumulated amortization
 
 
 
Patents
(8,473
)
 
(7,427
)
Customer relationships
(4,154
)
 
(3,387
)
Licenses
(4,831
)
 
(4,245
)
Acquired technology
(3,066
)
 
(2,508
)
Trademarks
(1,611
)
 
(1,331
)
Capitalized software development costs
(1,864
)
 
(1,766
)
Other
(676
)
 
(649
)
Total accumulated amortization
(24,675
)
 
(21,313
)
Net carrying amount
$
27,123

 
$
29,376
Estimated Amortization Expense
Estimated amortization expense for each of the next fiscal years is as follows (in thousands):
Fiscal year
Amount
2017
$
5,420

2018
4,958

2019
3,817

2020
3,435

2021
1,768

Thereafter
7,725

Total
$
27,123