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Short-term Investments
 6 Months Ended
Jun. 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 were included in short-term investments on the consolidated balance sheets:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

 

 

 

    

Cost

    

Gains

    

Losses

    

Fair Value

 

 

(in thousands)

Balance at June 30, 2019:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government-sponsored enterprise securities

 

$

11,872

 

$

10

 

$

 —

 

$

11,882

U.S. Treasury securities

 

 

42,351

 

 

43

 

 

 —

 

 

42,394

Total

 

$

54,223

 

$

53

 

$

 —

 

$

54,276

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

 

 

 

    

Cost

    

Gains

    

Losses

    

Fair Value

 

 

(in thousands)

Balance at 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.