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Investments
12 Months Ended
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]  
Investments

4. Investments

As of December 31, 2019 and 2018, the fair value of available-for-sale investments by type of security was as follows:

 

 

 

December 31, 2019

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Gain

 

 

Gross

Unrealized

Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate notes

 

$

5,489

 

 

$

2

 

 

$

 

 

$

5,491

 

Commercial paper

 

 

7,470

 

 

 

6

 

 

 

 

 

 

7,476

 

 

 

$

12,959

 

 

$

8

 

 

$

 

 

$

12,967

 

 

 

 

December 31, 2018

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Gain

 

 

Gross

Unrealized

Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate notes

 

$

3,647

 

 

$

 

 

$

(3

)

 

$

3,644

 

Commercial paper

 

 

6,418

 

 

 

 

 

 

(2

)

 

 

6,416

 

 

 

$

10,065

 

 

$

 

 

$

(5

)

 

$

10,060