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REVENUE (Tables) | 6 Months Ended
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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 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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