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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 (in thousands):

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

September 30, 2015

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

61,748

 

 

$

-

 

 

$

-

 

 

$

61,748

 

U.S. government agency securities

 

-

 

 

 

49,911

 

 

 

-

 

 

 

49,911

 

Corporate debt securities

 

-

 

 

 

103,875

 

 

 

-

 

 

 

103,875

 

Total

$

61,748

 

 

$

153,786

 

 

$

-

 

 

$

215,534

 

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

December 31, 2014

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

46,989

 

 

$

-

 

 

$

-

 

 

$

46,989

 

U.S. government agency securities

 

-

 

 

 

73,141

 

 

 

-

 

 

 

73,141

 

Total

$

46,989

 

 

$

73,141

 

 

$

-

 

 

$

120,130