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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2017
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 (in thousands):

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

September 30, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

14,124

 

 

$

-

 

 

$

-

 

 

$

14,124

 

U.S. Treasuries

 

-

 

 

 

33,649

 

 

 

-

 

 

 

33,649

 

U.S. government agency securities

 

-

 

 

 

95,731

 

 

 

-

 

 

 

95,731

 

Corporate debt securities

 

-

 

 

 

45,204

 

 

 

-

 

 

 

45,204

 

Total

$

14,124

 

 

$

174,584

 

 

$

-

 

 

$

188,708

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

18,981

 

 

$

-

 

 

$

-

 

 

$

18,981

 

U.S. Treasuries

 

-

 

 

 

3,499

 

 

 

-

 

 

 

3,499

 

U.S. government agency securities

 

-

 

 

 

30,437

 

 

 

-

 

 

 

30,437

 

Corporate debt securities

 

-

 

 

 

24,941

 

 

 

-

 

 

 

24,941

 

Total

$

18,981

 

 

$

58,877

 

 

$

-

 

 

$

77,858