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Available-for-Sale Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]  
Summary of Available-for-Sale Securities Held

The following tables summarize the available-for-sale securities held at September 30, 2019 and December 31, 2018 (in thousands):

 

September 30, 2019

 

Amortized cost

 

 

Gross unrealized

gains

 

 

Gross unrealized

losses

 

 

Fair Value

 

Commercial paper

 

$

36,175

 

 

$

30

 

 

$

—

 

 

$

36,205

 

Corporate debt securities

 

 

73,909

 

 

 

86

 

 

 

(4

)

 

 

73,991

 

U.S. government agency securities

 

 

1,006

 

 

 

2

 

 

 

—

 

 

 

1,008

 

Total

 

$

111,090

 

 

$

118

 

 

$

(4

)

 

$

111,204

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2018

 

Amortized cost

 

 

Gross unrealized

gains

 

 

Gross unrealized

losses

 

 

Fair Value

 

Commercial paper

 

$

53,549

 

 

$

—

 

 

$

(47

)

 

$

53,502

 

Corporate debt securities

 

 

54,022

 

 

 

4

 

 

 

(23

)

 

 

54,003

 

U.S. government agency securities

 

 

3,971

 

 

 

1

 

 

 

—

 

 

 

3,972

 

Total

 

$

111,542

 

 

$

5

 

 

$

(70

)

 

$

111,477