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Marketable Securities (Notes)
 3 Months Ended
Mar. 31, 2015
Marketable Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Marketable Securities
Included in marketable securities as of March 31, 2015 and December 31, 2014 are the following:
March 31, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
14,997

 
$
—

 
$
—

 
$
14,997

Government agency bonds
3,505

 
—

 
(1
)
 
3,504

United States treasuries
3,001

 
4

 
—

 
3,005

Corporate notes
3,605

 
3

 
—

 
3,608

Certificates of deposit
5,155

 
—

 
—

 
5,155

Municipal bonds
775

 
—

 
—

 
775

Total marketable securities designated as available-for-sale
$
31,038

 
$
7

 
$
(1
)
 
$
31,044

 
December 31, 2014
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
6,824

 
$
—

 
$
—

 
$
6,824

Government agency bonds
3,505

 
—

 
(3
)
 
3,502

United States treasuries
4,002

 
4

 
—

 
4,006

Corporate notes
4,665

 
2

 
—

 
4,667

Certificates of deposit
4,155

 
—

 
—

 
4,155

Municipal bonds
$
1,358

 
$
1

 
$
—

 
$
1,359

Total marketable securities designated as available-for-sale
$
24,509

 
$
7

 
$
(3
)
 
$
24,513


The amortized costs and fair value of debt securities as of March 31, 2015 and December 31, 2014 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
March 31, 2015
Amortized
Cost
 
Fair
Value
Due in less than one year
$
7,162

 
$
7,168

Due after one year and within two years
8,879

 
8,879

 
$
16,041

 
$
16,047

December 31, 2014
Amortized
Cost
 
Fair
Value
Due in less than one year
$
7,663

 
$
7,668

Due after one year and within two years
10,022

 
10,021

 
$
17,685

 
$
17,689


The Company realized gains of $30 and $32 from marketable securities during the three months ended March 31, 2015 and 2014, respectively.