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BUSINESS ACQUISITIONS - Summary of Preliminary Allocation of Purchase Consideration (Details) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 14, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Cash consideration: |  |  |  |  |
Net cash consideration |  | $ 346,852 | $ 0 |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Goodwill |  | 416,892 | $ 389,196 | $ 224,896 | $ 383,655
ECI |  |  |  |  |
Cash consideration: |  |  |  |  |
Repayment of ECI outstanding debt obligations | $ 183,300 | 183,266 |  |  |
Cash paid to selling shareholders | 139,200 | 139,244 |  |  |
Payment to selling shareholders from sale of ECI real estate assets |  | 33,400 |  |  |
Less cash and restricted cash acquired |  | (9,058) |  |  |
Net cash consideration | 322,500 | 346,852 |  |  |
Fair value of Ribbon stock issued | $ 108,600 | 108,550 |  |  |
Fair value of total consideration |  | 455,402 |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Current assets, net of cash and restricted cash acquired |  | 120,203 |  |  |
Property and equipment |  | 54,913 |  |  |
Goodwill |  | 191,996 |  |  |
Other noncurrent assets |  | 50,716 |  |  |
Deferred revenue |  | (4,369) |  |  |
Other current liabilities |  | (146,618) |  |  |
Deferred revenue, net of current |  | (3,726) |  |  |
Deferred tax liability |  | (13,308) |  |  |
Other long-term liabilities |  | (59,305) |  |  |
Fair value of assets acquired and liabilities assumed |  | 455,402 |  |  |
ECI | In-process research and development |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Intangible assets |  | 34,000 |  |  |
ECI | Developed technology |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Intangible assets |  | 111,900 |  |  |
ECI | Customer relationships |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Intangible assets |  | 116,000 |  |  |
ECI | Trade names |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |
Intangible assets |  | $ 3,000 |  |  |

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