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Accounts Payable and Other Current Liabilities (Tables)
3 Months Ended
Mar. 31, 2018
Accounts Payable and Other Current Liabilities [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Accounts payable and other current liabilities consisted of: 
 
As of

As of
 
March 31,

December 31,
 
2018

2017
Accounts payable
$
386

 
$
359

Accrued sales and use taxes
266

 
218

Accrued marketing and commissions
198

 
190

Deferred revenue – current
194

 
135

Accrued payroll and related
149

 
176

Public liability and property damage insurance liabilities – current
146

 
145

Accrued insurance
109

 
103

Other
329

 
293

Accounts payable and other current liabilities
$
1,777

 
$
1,619