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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities [Table Text Block]
Included in marketable securities as of September 30, 2015 and December 31, 2014 are the following:
September 30, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
15,722

 
$
—

 
$
—

 
$
15,722

Government agency bonds
1,503

 
—

 
—

 
1,503

United States treasuries
1,001

 
2

 
—

 
1,003

Corporate notes
2,528

 
1

 
—

 
2,529

Certificates of deposit
5,842

 
—

 
—

 
5,842

Total marketable securities designated as available-for-sale
$
26,596

 
$
3

 
$
—

 
$
26,599

 
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
Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block]
The amortized costs and fair value of debt securities as of September 30, 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.
September 30, 2015
Amortized
Cost
 
Fair
Value
Due in less than one year
$
4,311

 
$
4,314

Due after one year and within two years
6,563

 
6,563

 
$
10,874

 
$
10,877

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