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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2020 |  | 2019 |  | 2020
Cost per Served Sale | $ | 40,000 |  |  | $ | 33,618 |  |  | $ | 94,558 |  |  | $ | 84,817 |
Cost per Redemption | 15,611 |  |  | 12,004 |  |  | 43,851 |  |  | 33,411 |
Other | 808 |  |  | 457 |  |  | 2,728 |  |  | 1,582 |
Revenue | $ | 56,419 |  |  | $ | 46,079 |  |  | $ | 141,137 |  |  | $ | 119,810 |

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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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