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Intangible Assets
 3 Months Ended
Mar. 30, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Note 9. Intangible Assets
Finite-lived intangible assets are recorded at cost, less accumulated amortization. Finite-lived intangible assets as of March 30, 2013, and December 29, 2012 consisted of the following (in thousands):
 
 
Adjusted cost as of
 
Accumulated amortization as of
 
Net carrying amount as of
 
March 30, 2013
 
March 30, 2013
 
March 30, 2013
Developed technology
$
17,482

 
$
(8,871
)
 
$
8,611

Customer relationships
9,510

 
(8,800
)
 
710

Brand names
1,927

 
(1,625
)
 
302

Patented technology
2,252

 
(1,939
)
 
313

Trademark
80

 
(78
)
 
2

Total
$
31,251

 
$
(21,313
)
 
$
9,938

 
 
Adjusted cost as of December 29, 2012
 
Accumulated amortization as of December 29, 2012
 
Net carrying amount as of December 29, 2012
Developed technology
$
17,700

 
$
(8,277
)
 
$
9,423

Customer relationships
9,538

 
(8,643
)
 
895

Brand names
1,927

 
(1,599
)
 
328

Patented technology
2,252

 
(1,922
)
 
330

Trademark
80

 
(76
)
 
4

Total
$
31,497

 
$
(20,517
)
 
$
10,980


The amortization of finite-lived intangibles is computed using the straight-line method. Estimated lives of finite-lived intangibles range from 2 years to 10 years. Total amortization expense for the three month periods ended March 30, 2013 and March 31, 2012 was $0.9 million and $0.8 million, respectively.