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REVENUE - Nature of goods and services (Details) - USD ($) $ in Millions | 1 Months Ended | 144 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2019 | Dec. 31, 2031 | Jun. 30, 2020 | Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Deferred revenue transferred to buyer during sale | $ 22.0 |  |  |
Deferred Service Revenue |  |  | $ 8.8 | $ 9.2
Minimum | Scenario, Forecast [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Recognition of Deferred Revenue, Expected Annual Amount |  | $ 0.2 |  |
Maximum | Scenario, Forecast [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Recognition of Deferred Revenue, Expected Annual Amount |  | $ 1.0 |  |

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + 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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