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Investments (Tables)
9 Months Ended
Sep. 28, 2019
Amortized Cost and Fair Value of Available-for-Sale Investments
The amortized cost and fair values of
available-for-sale
investments are as follows at September 28, 2019 and December 29, 2018 (in thousands):
                                 
 
Amortized
Cost
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
September 28, 2019
 
 
 
 
 
 
 
 
 
 
 
 
Money market investments
  $
14,923
    $
    $
    $
14,923
 
Asset-backed securities
   
590
     
2
     
     
592
 
Corporate bonds and direct obligations of government agencies
   
97,704
     
1,513
     
31
     
99,186
 
U.S. Treasury obligations
   
2,334
     
21
     
     
2,355
 
                                 
Total
  $
115,551
    $
1,536
    $
31
    $
117,056
 
                                 
December 29, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Money market investments
  $
11,714
    $
—  
    $
—  
    $
11,714
 
Asset-backed securities
   
624
     
—  
     
4
     
620
 
Corporate bonds and direct obligations of government agencies
   
101,021
     
33
     
1,213
     
99,841
 
                                 
Total
  $
113,359
    $
33
    $
1,217
    $
112,175
 
                                 
 
 
 
 
 
 
 
 
 
Schedule of Unrealized Loss on Available-for-Sale Investments
For those
available-for-sale
investments with unrealized losses at September 28, 2019 and December 29, 2018, the following table summarizes the duration of the unrealized loss (in thousands):
                                                 
 
Less than 12 months
 
 
12 months or longer
 
 
Total
 
 
Fair
Value
 
 
Unrealized
Loss
 
 
Fair
Value
 
 
Unrealized
Loss
 
 
Fair
Value
 
 
Unrealized
Loss
 
September 28, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and direct obligations of government agencies
  $
3,817
    $
15
    $
6,953
    $
16
    $
10,770
    $
31
 
December 29, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities
  $
—  
    $
 —  
    $
620
    $
4
    $
620
    $
4
 
Corporate bonds and direct obligations of government agencies
   
45,960
     
354
     
42,803
     
859
     
88,763
     
1,213
 
                                                 
Total
  $
45,960
    $
354
    $
43,423
    $
863
    $
89,383
    $
1,217