XML 19 R9.htm IDEA: XBRL DOCUMENT v3.19.1
Short-term Investments
 3 Months Ended
Mar. 31, 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 March 31, 2019:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government-sponsored enterprise securities

 

$

11,821

 

$

 7

 

$

 —

 

$

11,828

U.S. Treasury securities

 

 

49,170

 

 

22

 

 

 —

 

 

49,192

Total

 

$

60,991

 

$

29

 

$

 —

 

$

61,020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. As of March 31, 2019, and December 31, 2018, all investments have contractual maturities within one year.