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Valuation and Qualifying accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule Of Valuation And Qualifying Accounts [Table Text Block]
 
Balance at
Beginning
of Period

 
Charged/
(Credited) to Revenues and Expenses
 
Write-Off of
Previously
Provided
Accounts
 
Balance at
End of
Period
Year Ended December 31, 2017:
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
36

 
$
(6
)
 
$
—

 
$
30

Allowance for Customer Returns and Sales Credits
$
528

 
$
2,845

 
$
(3,121
)
 
$
252

 
 
 
 
 
 
 
 
Year Ended December 31, 2016:
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
31

 
$
5

 
$
—

 
$
36

Allowance for Customer Returns and Sales Credits
$
490

 
$
3,713

 
$
(3,675
)
 
$
528