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Short-term Investments (Tables)
6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of short-term investments

Short-term investments as of December 31, 2019 consisted of the following (in thousands):

Gross

Amortized

 Unrealized

Estimated

    

 Cost

    

 Losses

    

 Fair Value

Municipal bonds and notes

$

2,986

$

$

2,986

Zero coupon bonds

 

33,919

 

 

33,919

Corporate bonds

 

19,509

 

(3)

 

19,506

Certificates of deposit

 

518

 

 

518

Total short-term investments

$

56,932

$

(3)

$

56,929

Short-term investments as of June 30, 2020 consisted of the following (in thousands):

Gross 

Amortized

Unrealized

Estimated

    

 Cost

    

Gains

    

 Fair Value

Zero coupon bonds

$

13,995

$

2

$

13,997

Corporate bonds

 

2,002

 

 

2,002

Certificates of deposit

 

530

 

 

530

Total short-term investments

$

16,527

$

2

$

16,529