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Marketable Securities - (Tables)
 9 Months Ended
Sep. 26, 2020
Marketable Securities [Abstract]  
Schedule of Marketable Securities by Category

At September 26, 2020 and December 31, 2019, marketable securities are categorized as follows:

 

 

 

Amortized Cost

 

 

Gross Unrealized Holding Gains

 

 

Gross Unrealized Holding Losses

 

 

Fair Value

 

September 26, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

111,137

 

 

$

270

 

 

$

6

 

 

$

111,401

 

Asset-backed securities

 

 

15,109

 

 

 

51

 

 

 

—

 

 

 

15,160

 

Certificates of deposit

 

 

39,649

 

 

 

36

 

 

 

—

 

 

 

39,685

 

Commercial paper

 

 

27,472

 

 

 

18

 

 

 

1

 

 

 

27,489

 

Corporate bonds

 

 

44,963

 

 

 

126

 

 

 

27

 

 

 

45,062

 

Total marketable securities

 

$

238,330

 

 

$

501

 

 

$

34

 

 

$

238,797

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

80,926

 

 

$

188

 

 

$

6

 

 

$

81,108

 

Asset-backed securities

 

 

10,767

 

 

 

12

 

 

 

—

 

 

 

10,779

 

Certificates of deposit

 

 

30,500

 

 

 

7

 

 

 

—

 

 

 

30,507

 

Commercial paper

 

 

30,707

 

 

 

1

 

 

 

—

 

 

 

30,708

 

Corporate bonds

 

 

36,409

 

 

 

52

 

 

 

—

 

 

 

36,461

 

Total marketable securities

 

$

189,309

 

 

$

260

 

 

$

6

 

 

$

189,563

 
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities Classified by Maturity Date

The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Condensed Consolidated Balance Sheets classification, is as follows at September 26, 2020 and December 31, 2019:

 

 

 

September 26, 2020

 

 

December 31, 2019

 

 

 

Amortized Cost

 

 

Fair Value

 

 

Amortized Cost

 

 

Fair Value

 

Due within one year

 

$

172,828

 

 

$

173,166

 

 

$

152,649

 

 

$

152,852

 

Due after one through five years

 

 

65,502

 

 

 

65,631

 

 

 

36,660

 

 

 

36,711

 

Due after five through ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Due after ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Total marketable securities

 

$

238,330

 

 

$

238,797

 

 

$

189,309

 

 

$

189,563

 
Summary of Estimated Fair Value and Gross Unrealized Holding Losses of Marketable Securities in Unrealized Loss Position

 

The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position, at September 26, 2020 and December 31, 2019:

 

 

 

In Unrealized Loss Position For

Less Than 12 Months

 

 

In Unrealized Loss Position For

Greater Than 12 Months

 

 

 

Fair Value

 

 

Gross Unrealized Losses

 

 

Fair Value

 

 

Gross Unrealized Losses

 

September 26, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

6,026

 

 

$

6

 

 

$

—

 

 

$

—

 

Commercial paper

 

 

4,497

 

 

 

1

 

 

 

—

 

 

 

—

 

Corporate bonds

 

 

17,858

 

 

 

27

 

 

 

—

 

 

 

—

 

Total

 

$

28,381

 

 

$

34

 

 

$

—

 

 

$

—

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

14,166

 

 

$

6

 

 

$

—

 

 

$

—

 

Total

 

$

14,166

 

 

$

6

 

 

$

—

 

 

$

—