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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities
Included in marketable securities as of December 31, 2014 and 2013 are the following:
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

 
0

 
—

 
4,155

Municipal bonds
1,358

 
1

 
—

 
1,359

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

 
$
7

 
$
(3
)
 
$
24,513

 
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
Available-for-sale securities, debt maturities, amortized cost and fair value basis
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

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