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RESTRUCTURING AND RELATED ACTIVITIES (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Restructuring and Related Activities [Abstract] |  |
Schedule of Restructuring Reserve by Type of Cost | The following is a summary of accrued restructuring costs related to the 2021 Restructuring Plan, (in thousands): ​
​ | ​ | ​ | ​
Balance as of December 31, 2021 |  | $ | 1,497
Cash payments | ​ |  | (1,103)
Balance at June 30, 2022 | ​ | $ | 394
| The following is a summary of accrued restructuring costs related to the Restructuring Plan: ​
​ | ​ | ​ | ​
​ |  | December 31, 2021
​ | ​ | (in thousands)
Severance and benefits costs | ​ | $ | 2,792
Contract termination costs | ​ |  | 2,736
Other restructuring costs | ​ |  | —
Total restructuring costs | ​ | $ | 5,528
Cash payments | ​ |  | (4,031)
Balance at December 31, 2021 | ​ | $ | 1,497

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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