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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES (Tables) | 9 Months Ended
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Sep. 30, 2020
Restructuring and Related Activities [Abstract] |
Summary of restructuring accrual activity | The components of Restructuring and related expense for the three and nine months ended September 30, 2020 and 2019 were as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019
Severance and related costs | $ | 1,789 |  |  | $ | 719 |  |  | $ | 8,276 |  |  | $ | 11,619 |
Variable and other facilities-related costs | 1,501 |  |  | $ | 1,052 |  |  | 2,380 |  |  | 1,370 |
Accelerated amortization of lease assets due to cease-use | — |  |  | $ | 601 |  |  | 70 |  |  | 3,459 |
| $ | 3,290 |  |  | $ | 2,372 |  |  | $ | 10,726 |  |  | $ | 16,448 |
A summary of the 2020 Restructuring Initiative accrual activity for severance and related costs for the nine months ended September 30, 2020 is as follows (in thousands):
| Balance at January 1, 2020 |  | Initiatives charged to expense |  |  |  |  |  | Cash payments |  |  |  | Balance at September 30, 2020
Severance | $ | — |  |  | $ | 7,691 |  |  |  |  |  |  | $ | (3,375) |  |  |  |  | $ | 4,316 |
Facilities | — |  |  | 999 |  |  |  |  |  |  | (79) |  |  |  |  | 920 |
| $ | — |  |  | $ | 8,690 |  |  |  |  |  |  | $ | (3,454) |  |  |  |  | $ | 5,236 |
A summary of the 2019 Restructuring Initiative accrual activity for severance and related costs for the nine months ended September 30, 2020 is as follows (in thousands):
| Balance at January 1, 2020 |  | Initiatives charged to expense |  | Adjustments for changes in estimate |  | Reclassify accelerated amortization to operating lease liabilities |  | Cash payments |  |  |  | Balance at September 30, 2020
Severance | $ | 2,110 |  |  | $ | 723 |  |  | $ | (80) |  |  | $ | — |  |  | $ | (2,234) |  |  |  |  | $ | 519 |
Facilities | 991 |  |  | 1,473 |  |  | (22) |  |  | (70) |  |  | (1,573) |  |  |  |  | 799 |
| $ | 3,101 |  |  | $ | 2,196 |  |  | $ | (102) |  |  | $ | (70) |  |  | $ | (3,807) |  |  |  |  | $ | 1,318 |
A summary of the GENBAND Merger Restructuring Initiative accrual activity for the nine months ended September 30, 2020 is as follows (in thousands):
| Balance at January 1, 2020 |  |  |  | Adjustments for changes in estimate |  |  |  | Cash payments |  |  |  | Balance at September 30, 2020
Severance | $ | 409 |  |  |  |  | $ | (58) |  |  |  |  | $ | (351) |  |  |  |  | $ | — |

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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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