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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured on Recurring Basis The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
 
 
Fair Value Measurements as of September 30, 2016
 
Fair Value Measurements as of December 31, 2015
Description
 
Total
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
Money market funds
 
$
37,455

 
$
37,455

 
$
—

 
$
53,365

 
$
53,365

 
$
—

U.S. treasury debt securities
 
3,506

 
—

 
3,506

 
4,774

 
—

 
4,774

U.S. corporate debt securities
 
7,489

 
—

 
7,489

 
12,646

 
—

 
12,646

 
 
$
48,450

 
$
37,455

 
$
10,995

 
$
70,785

 
$
53,365

 
$
17,420

 
 
 
 
 
 
 
 
 
 
 
 
 
Included in cash and cash equivalents
 
$
37,455

 
 
 
 
 
$
53,365

 
 
 
 
Included in marketable securities
 
$
10,995

 
 
 
 
 
$
17,420