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v3.20.4

Restructuring Charges (Tables) | 12 Months Ended
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Dec. 31, 2020
Restructuring Charges |
Schedule of restructuring accrual activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Personnel |  | Facility |  | ​ | ​
​ | ​ | Severance and | ​ | Related Costs | ​ | ​ | ​
​ | ​ | Related Costs | ​ | and Other | ​ | ​ | Total
​ | ​ | (in thousands)
Balance - December 31, 2017 | ​ | $ | 1,520 | ​ | $ | — | ​ | $ | 1,520
Provision | ​ |  | 4,681 | ​ |  | 2,714 | ​ |  | 7,395
Payments | ​ |  | (4,058) | ​ |  | (2,644) | ​ |  | (6,702)
Balance - December 31, 2018 | ​ |  | 2,143 | ​ | ​ | 70 | ​ | ​ | 2,213
Provision | ​ |  | 5,803 | ​ | ​ | 203 | ​ | ​ | 6,006
Payments | ​ |  | (5,105) | ​ | ​ | (273) | ​ | ​ | (5,378)
Balance - December 31, 2019 | ​ | ​ | 2,841 | ​ | ​ | — | ​ | ​ | 2,841
Provision | ​ | ​ | 1,097 | ​ | ​ | — | ​ | ​ | 1,097
Payments | ​ | ​ | (3,659) | ​ | ​ | — | ​ | ​ | (3,659)
Balance - December 31, 2020 | ​ | $ | 279 | ​ | $ | — | ​ | $ | 279

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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