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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities
Included in marketable securities as of December 31, 2013 and 2012 are the following:
December 31, 2013
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
19,957

 
$
—

 
$
—

 
$
19,957

Government agency bonds
7,515

 
—

 
(6
)
 
7,509

United States treasuries
8,035

 
6

 
—

 
8,041

Corporate notes
8,457

 
 
 
(4
)
 
8,453

Certificates of deposit
2,426

 
—

 
—

 
2,426

Total marketable securities designated as available for sale
$
46,390

 
$
6

 
$
(10
)
 
$
46,386

 
December 31, 2012
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
9,921

 
$
—

 
$
—

 
$
9,921

Government agency bonds
6,817

 
1

 
—

 
6,818

United States treasuries
6,089

 
—

 
—

 
6,089

Corporate notes
4,682

 
—

 
(3
)
 
4,679

Certificates of deposit
1,800

 
—

 
—

 
1,800

Total marketable securities designated as available for sale
$
29,309

 
$
1

 
$
(3
)
 
$
29,307
Available-for-sale securities, debt maturities, amortized cost and fair value basis
Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
December 31, 2013
Amortized
Cost
 
Fair
Value
Due in less than one year
$
31,023

 
$
31,023

Due after one year and within two years
15,367

 
15,363

 
$
46,390

 
$
46,386

December 31, 2012
Amortized
Cost
 
Fair
Value
Due in less than one year
$
22,485

 
$
22,485

Due after one year and within two years
6,824

 
6,822

 
$
29,309

 
$
29,307