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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Measurements [Abstract]  
Fair Value Hierarchy
The following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands):
 
 
 
Fair Value at June 30, 2015
 
Fair Value at December 31, 2014
 
Assets
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
Money market funds
 
$
125,090
 
$
—
 
$
—
 
$
20,354
 
$
—
 
$
—
 
Government-backed  security
 
 
—
 
 
28,000
 
 
—
 
 
—
 
 
7,500
 
 
—
 
Asset-backed securities
 
 
—
 
 
49,466
 
 
—
 
 
—
 
 
46,624
 
 
—
 
Corporate debt securities
 
 
—
 
 
99,179
 
 
—
 
 
—
 
 
89,097
 
 
—
 
Total cash equivalents and marketable securities
 
$
125,090
 
$
176,645
 
$
—
 
$
20,354
 
$
143,221
 
$
—