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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Hierarchy of Financial Assets Carried at Fair Value

As of June 30, 2016 and December 31, 2015, the fair value hierarchy for our financial assets that are carried at fair value was as follows (in thousands), and unrealized gains (losses) on all financial assets for all periods presented were less than $1.0 million:

 

 

 

June 30, 2016

 

 

December 31, 2015

 

 

 

Fair

Value

 

 

Level I

 

 

Level II

 

 

Level III

 

 

Fair

Value

 

 

Level I

 

 

Level II

 

 

Level III

 

Money market funds

 

$

2,761,729

 

 

$

2,761,729

 

 

$

 

 

$

 

 

$

297,810

 

 

$

297,810

 

 

$

 

 

$

 

U.S. treasury bills

 

 

-

 

 

 

-

 

 

 

 

 

 

 

 

 

16,664

 

 

 

16,664

 

 

 

 

 

 

 

Total

 

$

2,761,729

 

 

$

2,761,729

 

 

$

 

 

$

 

 

$

314,474

 

 

$

314,474

 

 

$

 

 

$