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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities [Table Text Block]
Included in marketable securities as of March 31, 2016 and December 31, 2015 are the following:
March 31, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
15,551

 
$
—

 
$
—

 
$
15,551

Corporate notes
1,001

 
—

 
—

 
1,001

Certificates of deposit
6,086

 
—

 
—

 
6,086

Total marketable securities designated as available-for-sale
$
22,638

 
$
—

 
$
—

 
$
22,638

 
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
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 March 31, 2016 and December 31, 2015 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, 2016
Amortized
Cost
 
Fair
Value
Due in less than one year
$
4,585

 
$
4,585

Due after one year and within two years
2,502

 
2,502

 
$
7,087

 
$
7,087

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