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Other Current Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Other Current Assets Disclosure [Abstract]  
Schedule of Other Current Assets [Table Text Block]
 
As of
June 30,
2018
 
As of
December 31,
2017
Sales and use taxes
$
402

 
$
174

Prepaid expenses
252

 
196

Other
178

 
163

Other current assets
$
832

 
$
533