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Marketable Securities Marketable Securities
 6 Months Ended
Jun. 30, 2018
Marketable Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Marketable Securities
Marketable securities as of June 30, 2018 and December 31, 2017 consisted of the following:
June 30, 2018
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
335

 
$
—

 
$
—

 
$
335

Total marketable securities designated as available-for-sale
$
335

 
$
—

 
$
—

 
$
335

 
December 31, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Money market mutual funds
$
7,318

 
$
—

 
$
—

 
$
7,318

Certificates of deposit
1,002

 
—

 
(1
)
 
1,001

Total marketable securities designated as available-for-sale
$
8,320

 
$
—

 
$
(1
)
 
$
8,319


The amortized costs and fair value of marketable securities as of June 30, 2018 and December 31, 2017 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.
June 30, 2018
Amortized
Cost
 
Fair
Value
Due in less than one year
$
—

 
$
—

December 31, 2017
Amortized
Cost
 
Fair
Value
Due in less than one year
$
1,002

 
$
1,001


Interest income from marketable securities was $3 and $30 during the three months ended June 30, 2018 and 2017,