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Financial Instruments
 9 Months Ended
Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]  
Financial Instruments

4. Financial Instruments

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

 

 

 

September 30, 2017

 

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

 

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gain

 

 

(Loss)

 

 

Value

 

 

Cost

 

 

Gain

 

 

(Loss)

 

 

Value

 

Money market funds

 

$

107,888

 

 

$

—

 

 

$

—

 

 

$

107,888

 

 

$

6,254

 

 

$

—

 

 

$

—

 

 

$

6,254

 

Corporate notes and commercial paper

 

 

273,897

 

 

 

1

 

 

 

(10

)

 

 

273,888

 

 

 

133,112

 

 

 

1

 

 

 

(14

)

 

$

133,099

 

U.S. government agency securities

 

 

180,681

 

 

 

5

 

 

 

(34

)

 

 

180,652

 

 

 

55,934

 

 

 

5

 

 

 

(3

)

 

$

55,936

 

 

 

$

562,466

 

 

$

6

 

 

$

(44

)

 

$

562,428

 

 

$

195,300

 

 

$

6

 

 

$

(17

)

 

$

195,289

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

308,696

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

64,998

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

225,107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

130,291

 

Long-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28,625

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

—

 

Total cash equivalents and investments

 

 

 

 

 

 

 

 

 

 

 

 

 

$

562,428

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$

195,289

 

 

At September 30, 2017, the remaining contractual maturities of available-for-sale securities were less than two years and at December 31, 2016, the remaining contractual maturities of available-for-sale securities were less than one year. There have been no significant realized losses on available-for-sale securities for the periods presented.