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Financial Instruments and Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis
The financial instruments measured at fair value on a recurring basis at June 30, 2013 were as follows:
 
Level 1
 
Level 2
 
Level 3
 
Total Fair Value
Money market funds
$
34,311

 
$
—

 
$
—

 
$
34,311

Debt Securities:
 
 
 
 
 
 
 
U.S. Treasury securities
84,982

 
—

 
—

 
84,982

Corporate debt securities
—

 
29,537

 
—

 
29,537

 
$
119,293

 
$
29,537

 
$
—

 
$
148,830
Carrying Amount and Fair Value of Financial Instruments
The carrying amount and fair value of the Company’s financial instruments were as follows (the table below excludes financial instruments with carrying values that approximate their fair values):
 
June 30, 2013
 
December 31, 2012
 
Carrying value
 
Fair value
 
Level
 
Carrying value
 
Fair value
 
Level
Assets
 
 
 
 
 
 
 
 
 
 
 
Pledged treasury securities
$
26,541

 
$
29,623

 
1
 
$
26,818

 
$
30,432

 
1
Retained interest investment
$
9,543

 
$
12,673

 
3
 
$
9,481

 
$
12,392

 
3