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REVENUE (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2020
 
2019
 
2020
Cost per Served Sale
$
33,549

 
$
20,353

 
$
54,558

 
$
51,199

Cost per Redemption
14,276

 
7,339

 
28,240

 
21,407

Other
905

 
530

 
1,920

 
1,125

Revenue
$
48,730

 
$
28,222

 
$
84,718

 
$
73,731