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Financial Instruments
 12 Months Ended
Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]  
Financial Instruments

4. Financial Instruments

Cash equivalents and short-term and long-term investments, all of which are classified as available-for-sale securities, consisted of the following (in thousands):

 

 

 

December 31, 2016

 

 

December 31, 2015

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

 

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

Money market funds

 

$

6,254

 

 

$

–

 

 

$

–

 

 

$

6,254

 

 

$

22,074

 

 

$

–

 

 

$

–

 

 

$

22,074

 

Corporate notes and

   commercial paper

 

 

133,112

 

 

 

1

 

 

 

(14

)

 

$

133,099

 

 

 

242,089

 

 

 

3

 

 

 

(59

)

 

 

242,033

 

U.S. government agency securities

 

 

55,934

 

 

 

5

 

 

 

(3

)

 

$

55,936

 

 

 

180,970

 

 

 

1

 

 

 

(95

)

 

 

180,876

 

 

 

$

195,300

 

 

$

6

 

 

$

(17

)

 

$

195,289

 

 

$

445,133

 

 

$

4

 

 

$

(154

)

 

$

444,983

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

64,998

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

171,310

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

130,291

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

257,713

 

Long-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15,960

 

Total cash equivalents and

   investments

 

 

 

 

 

 

 

 

 

 

 

 

 

$

195,289

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

444,983

 

 

At December 31, 2016, the remaining contractual maturities of available-for-sale securities were less than one year. There have been no significant realized gains or losses on available-for-sale securities for the periods presented. Available-for-sale debt securities that were in a continuous loss position but were not deemed to be other than temporarily impaired were immaterial at both December 31, 2016 and 2015.