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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Marketable Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
Included in marketable securities as of September 30, 2016 and December 31, 2015 are the following:
September 30, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
23,868

 
$
—

 
$
—

 
$
23,868

Certificates of deposit
4,816

 
—

 
—

 
4,816

Total marketable securities designated as available-for-sale
$
28,684

 
$
—

 
$
—

 
$
28,684

 
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 September 30, 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.
September 30, 2016
Amortized
Cost
 
Fair
Value
Due in less than one year
$
4,275

 
$
4,275

Due after one year and within two years
541

 
541

 
$
4,816

 
$
4,816

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