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Business Description, Basis of Presentation and Significant Accounting Policies Schedule of Deferred Revenue, COGS and Gross Margin (Tables)
 12 Months Ended
Dec. 31, 2014
Schedule of Deferred Revenue, COGS, and Gross Margin [Abstract]  
Schedule of Deferred Revenue and Associated Cost of Goods Sold and Gross Profit [Table Text Block]
The details of deferred revenue and associated cost of goods sold and gross profit are as follows:
 
As of December 31,
 
2014
 
2013
Deferred revenue
$
5,004

 
$
4,158

Deferred cost of goods sold
1,698

 
1,520

Deferred gross profit
$
3,306

 
$
2,638