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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets [Table Text Block] |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
(In thousands) | ​ | Gross | ​ | Amortization | ​ | Net | ​ | Gross | ​ | Amortization | ​ | Net
Domain name | ​ | $ | 1,261 | ​ | $ | — | ​ | $ | 1,261 | ​ | $ | 1,261 | ​ | $ | — | ​ | $ | 1,261
Developed technology | ​ |  | 37,960 | ​ |  | (29,126) | ​ |  | 8,834 | ​ |  | 37,960 | ​ |  | (25,933) | ​ |  | 12,027
Customer relationships | ​ |  | 16,700 | ​ |  | (15,687) | ​ |  | 1,013 | ​ |  | 20,030 | ​ |  | (18,098) | ​ |  | 1,932
Technology licenses | ​ |  | 1,926 | ​ |  | (528) | ​ |  | 1,398 | ​ |  | 1,926 | ​ |  | (281) | ​ |  | 1,645
Total intangible assets | ​ | $ | 57,847 | ​ | $ | (45,341) | ​ | $ | 12,506 | ​ | $ | 61,177 | ​ | $ | (44,312) | ​ | $ | 16,865
Schedule of expected amortization expense [Table Text Block] | The estimated future amortization expense related to definite-lived intangible assets at December 31, 2020, is as follows:
​ | ​ | ​ | ​
​ |  | Estimated
​ | ​ | Amortization
Fiscal Year | ​ | (In thousands)
2021 | ​ | $ | 3,494
2022 | ​ |  | 2,415
2023 | ​ |  | 2,173
2024 | ​ |  | 1,279
2025 | ​ |  | 832
Thereafter | ​ |  | 1,052
Total | ​ | $ | 11,245

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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