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INTANGIBLE ASSETS AND GOODWIL (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule of Composition of Intangible Assets |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | December 31,
​ |  | June 30, 2022 |  | 2021
IPR&D intangible assets: | ​ | ​ |  | ​ | ​ |
Vicineum European Union rights | ​ | $ | — | ​ | $ | 14,700
Total Intangibles | ​ | $ | — | ​ | $ | 14,700
| The following table sets forth the composition of intangible assets as of December 31, 2021 and 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2021 |  | 2020
IPR&D intangible assets: |  | ​ |  |  | ​ |
Vicineum United States rights | ​ | $ | — | ​ | $ | 31,700
Vicineum European Union rights | ​ |  | 14,700 | ​ |  | 14,700
Total Intangibles | ​ | $ | 14,700 | ​ | $ | 46,400
Schedule of Goodwill | The following table sets forth a summary of the change in goodwill as of June 30, 2022 and December 31, 2021 (in thousands). ​
​ | ​ | ​ | ​
Balance at December 31, 2021 |  | $ | 13,064
Impairment loss |  | ​ | (13,064)
Balance at June 30, 2022 | ​ | $ | —

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