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Investments
 9 Months Ended
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]  
Investments

4.

Investments

As of September 30, 2019 the fair value of available-for-sale investments by type of security was as follows:

 

 

 

September 30, 2019

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Gain

 

 

Gross

Unrealized

Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial paper

 

$

17,920

 

 

$

—

 

 

$

—

 

 

$

17,920

 

Corporate bonds

 

 

15,023

 

 

 

6

 

 

 

—

 

 

 

15,029

 

Government securities

 

 

545

 

 

 

—

 

 

 

—

 

 

 

545

 

Treasury bonds

 

 

997

 

 

 

1

 

 

 

—

 

 

 

998

 

 

 

$

34,485

 

 

$

7

 

 

$

—

 

 

$

34,492

 

 

Investments with original maturities of less than 90 days are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the table above. Investments with maturities of less than 12 months are considered current and those investments with maturities greater than 12 months are considered non-current.