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Short-Term Investments (Tables)
 3 Months Ended
Apr. 03, 2015
Cash and Cash Equivalents [Abstract]  
Summary of Short-Term Investments
The following table summarizes the Company’s short-term investments (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
As of April 3, 2015
 
 
 
 
 
 
 
State, municipal and local government agencies bonds
$
11,228

 
$
10

 
$
—

 
$
11,238

Corporate bonds
10,969

 
1

 
(5
)
 
10,965

Total short-term investments
$
22,197

 
$
11

 
$
(5
)
 
$
22,203

As of December 31, 2014
 
 
 
 
 
 
 
State, municipal and local government agencies bonds
$
13,946

 
$
16

 
$
(1
)
 
$
13,961

Corporate bonds
17,899

 
3

 
(16
)
 
17,886

Total short-term investments
$
31,845

 
$
19

 
$
(17
)
 
$
31,847
Maturities of Short-Term Investments
The following table summarizes the maturities of the Company’s short-term investments (in thousands):
 
April 3, 2015
 
December 31, 2014
Less than one year
$
22,203

 
$
30,946

Due in 1 - 2 years
—

 
901

Total short-term investments
$
22,203

 
$
31,847