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Available-for-Sale Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2019 and December 31, 2018 (in thousands):

 

March 31, 2019

 

Amortized cost

 

 

Gross unrealized

gains

 

 

Gross unrealized

losses

 

 

Fair Value

 

Corporate debt securities

 

$

90,062

 

 

$

42

 

 

$

(3

)

 

$

90,101

 

U.S. government agency and treasury securities

 

$

3,990

 

 

$

—

 

 

$

—

 

 

$

3,990

 

Total

 

$

94,052

 

 

$

42

 

 

$

(3

)

 

$

94,091

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2018

 

Amortized cost

 

 

Gross unrealized

gains

 

 

Gross unrealized

losses

 

 

Fair Value

 

Corporate debt securities

 

$

107,571

 

 

$

4

 

 

$

(70

)

 

$

107,505

 

U.S. government agency securities

 

$

3,971

 

 

$

1

 

 

$

—

 

 

$

3,972

 

Total

 

$

111,542

 

 

$

5

 

 

$

(70

)

 

$

111,477