XML 39 R28.htm IDEA: XBRL DOCUMENT v2.4.0.6
Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities
Included in marketable securities as of December 31, 2012 and 2011 are the following:
December 31, 2012
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
9,921

 
$
—

 
$
—

 
$
9,921

Government agency bonds
6,816

 
1

 
—

 
6,817

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
$
29,308

 
$
1

 
$
(3
)
 
$
29,306

 
December 31, 2011
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
8,818

 
$
—

 
$
—

 
$
8,818

Government agency bonds
9,014

 
1

 
—

 
9,015

United States treasuries
—

 
—

 
—

 
—

Corporate notes
3,019

 
—

 
—

 
3,019

Certificates of deposit
2,701

 
—

 
—

 
2,701

Total marketable securities designated as available for sale
$
23,552

 
$
1

 
$
—

 
$
23,553
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, 2012
Amortized
Cost
 
Fair
Value
Due in less than one year
$
22,485

 
$
22,485

Due after one year and within two years
6,823

 
6,821

 
$
29,308

 
$
29,306

December 31, 2011
Amortized
Cost
 
Fair
Value
Due in less than one year
$
15,538

 
$
15,538

Due after one year and within two years
8,014

 
8,015

 
$
23,552

 
$
23,553