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Marketable Securities
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
Included in marketable securities as of December 31, 2015 and 2014 are the following:
December 31, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
13,244

 
$
—

 
$
—

 
$
13,244

United States treasuries
1,002

 
—

 
—

 
1,002

Corporate notes
2,283

 
1

 
—

 
2,284

Certificates of deposit
6,089

 
—

 
—

 
6,089

Total marketable securities designated as available-for-sale
$
22,618

 
$
1

 
$
—

 
$
22,619

 
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 December 31, 2015 and 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.
December 31, 2015
Amortized
Cost
 
Fair
Value
Due in less than one year
$
5,515

 
$
5,516

Due after one year and within two years
3,859

 
3,859

 
$
9,374

 
$
9,375

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


Interest income from marketable securities was $110 for the years ended December 31, 2015, and 2014, respectively.