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FAIR VALUE (NARRATIVE) (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Aug. 05, 2020 | Dec. 31, 2019 USD ($)
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Line of credit |  |  |  |  | $ 325,000,000 |  |  | $ 290,000,000
Average interest rate on annual borrowings |  |  |  |  | 1.30% |  |  |
Purchase Price Payable Payments During Period |  |  |  |  | $ 0 |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  | 12,728,000 |  |  | 6,134,000
FCR |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Purchase Price Payable Payments During Period |  |  |  |  | 0 |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  | $ 1,785,000 |  |  | $ 6,134,000
Increase (decrease) in contingent consideration payable | $ 1,100,000 | $ 3,300,000 | $ 1,100,000 | $ 3,300,000 |  |  |  |
FCR | Discount Rate |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  |  |  | 16.7 |  |  |
Voice Foundry US |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Purchase Price Payable Payments During Period |  |  |  |  | $ 0 |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  | $ 10,943,000 |  |  |
Voice Foundry US | Discount Rate |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  |  |  | 23.1 |  | 23.1 |
CafeX [Member] |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |
Impairment of equity investment |  |  |  |  | $ 0 | $ 15,600,000 |  |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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