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Short-term Investments
 9 Months Ended
Sep. 30, 2019
Short-term Investment  
Short-term Investments

3. Short-Term Investments

The following table summarizes the amortized cost and estimated fair value of the Company’s marketable securities, which are considered to be available-for-sale investments and are included in short-term investments on the consolidated balance sheets:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

 

 

 

    

Cost

    

Gains

    

Losses

    

Fair Value

 

 

(in thousands)

Balance as of September 30, 2019:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government-sponsored enterprise securities

 

$

6,091

 

$

 3

 

$

 —

 

$

6,094

U.S. Treasury securities

 

 

27,396

 

 

19

 

 

 —

 

 

27,415

Total

 

$

33,487

 

$

22

 

$

 —

 

$

33,509

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

 

 

 

    

Cost

    

Gains

    

Losses

    

Fair Value

 

 

(in thousands)

Balance as of December 31, 2018:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government-sponsored enterprise securities

 

$

6,059

 

$

 —

 

$

 —

 

$

6,059

U.S. Treasury securities

 

 

29,680

 

 

 —

 

 

(7)

 

 

29,673

Total

 

$

35,739

 

$

 —

 

$

(7)

 

$

35,732

 

Certain short-term debt securities with original maturities of less than 90 days are included in cash and cash equivalents on the consolidated balance sheets and are not included in the tables above. As of September 30, 2019 and December 31, 2018, all short-term investments have contractual maturities within one year.