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Short-term Investments (Tables)
9 Months Ended
Sep. 30, 2017
Short Term Investments [Abstract]  
Summary of Short-term Investments

The following table summarizes the Company’s short-term investments accounted for as available-for-sale securities as of September 30, 2017, and December 31, 2016 (in thousands):

 

 

 

Maturity (in

years)

 

Amortized

Cost

 

 

Unrealized

Losses

 

 

Unrealized

Gains

 

 

Estimated

Fair Value

 

September 30, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasury debt securities

 

1 or less

 

 

25,996

 

 

 

(13

)

 

 

 

 

 

25,983

 

Total

 

 

 

$

25,996

 

 

$

(13

)

 

$

 

 

$

25,983

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasury debt securities

 

1 or less

 

 

3,504

 

 

 

(1

)

 

 

 

 

 

3,503

 

Total

 

 

 

$

3,504

 

 

$

(1

)

 

$

 

 

$

3,503