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Investments
 9 Months Ended
Sep. 30, 2019
Investments  
Investments

3. Investments

Investments consist of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

September 30, 2019

 

 

 

 

 

Gross

 

Gross

 

 

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

Estimated

 

    

Cost

    

Gain

    

Loss

    

Fair Value

U.S. treasury securities

 

$

19,982

 

$

 1

 

$

 —

 

$

19,983

Agency bonds

 

 

47,178

 

 

 —

 

 

(17)

 

 

47,161

Corporate bonds

 

 

107,045

 

 

20

 

 

(62)

 

 

107,003

Total

 

$

174,205

 

$

21

 

$

(79)

 

$

174,147

 

As of September 30, 2019, no investments are considered to be other-than-temporarily impaired. The Company uses the specific identification method when calculating realized gains and losses. For the three and nine months ended September 30, 2019, the Company recorded no realized gains and losses on available-for-sale securities.