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DEBT - Assumed Senior Secured Credit Agreement (Details) - USD ($) | Dec. 31, 2019 | Apr. 29, 2019 | Dec. 31, 2018 | Dec. 21, 2017 | Oct. 27, 2017
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Debt Instrument [Line Items] |  |  |  |  |
Debt average interest rate |  |  | 5.96% |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt average interest rate | 3.30% |  |  |  |
Line of credit potential increases |  | $ 100,000,000 |  | $ 100,000,000 |
Silicon Valley Bank | Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current borrowing capacity for line of credit | $ 50,000,000 |  |  |  |
Potential further increases | 75,000,000 |  |  |  |
Line of credit potential increases | $ 125,000,000 |  |  |  |
GENBAND |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt average interest rate |  |  |  |  | 4.67%
Line of Credit | GENBAND |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt assumed as part of GENBAND merger |  |  |  |  | $ 17,900,000
Letter of Credit | GENBAND |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt assumed as part of GENBAND merger |  |  |  |  | $ 2,900,000

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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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