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REVENUE RECOGNITION (Tables) | 6 Months Ended
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Jun. 30, 2022
Revenue from Contract with Customer [Abstract] |
Disaggregated revenue | The following table presents the disaggregation of our revenue for the three and six months ended June 30, 2022 and 2021 (in thousands):
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Fixed fee license revenue | $ | 1,246 |  |  | $ | 1,824 |  |  | $ | 2,991 |  |  | $ | 3,099 |
Per-unit royalty revenue | 6,672 |  |  | 9,057 |  |  | 12,157 |  |  | 14,850 |
Total royalty and license revenue | 7,918 |  |  | 10,881 |  |  | 15,148 |  |  | 17,949 |
Development, services, and other revenue | 65 |  |  | 129 |  |  | 143 |  |  | 220 |
Total revenues | $ | 7,983 |  |  | $ | 11,010 |  |  | $ | 15,291 |  |  | $ | 18,169 |

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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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 + Details
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