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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
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:
 
 
 
Fair Value at December 31, 2014
 
Fair Value at December 31, 2013
 
Assets
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
Auction rate security
 
$
—
 
$
—
 
$
—
 
$
1,790
 
$
—
 
$
—
 
Money market funds
 
 
20,354
 
 
—
 
 
—
 
 
100,049
 
 
—
 
 
—
 
Government-backed  security
 
 
—
 
 
7,500
 
 
—
 
 
—
 
 
—
 
 
—
 
Asset-backed securities
 
 
—
 
 
46,624
 
 
—
 
 
—
 
 
—
 
 
—
 
Corporate debt securities
 
 
—
 
 
89,097
 
 
—
 
 
—
 
 
26,978
 
 
—
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash equivalents and marketable securities
 
$
20,354
 
$
143,221
 
$
—
 
$
101,839
 
$
26,978
 
$
—