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REVENUE RECOGNITION (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized that was previously recorded as deferred revenue |  |  |  |  |  |  |  |  | $ 94,000,000 | $ 84,000,000 |
Capitalized contract cost, amortization period | 5 years |  |  |  |  |  |  |  | 5 years |  | 5 years
Deferred sales commissions accrued | $ 3,600,000 |  |  |  | $ 2,700,000 |  |  |  | $ 3,600,000 | 2,700,000 |
Prior period adjustment related to the adoption of Accounting Standards Codification 606, Revenue from Contracts with Customers, tax |  |  |  |  | 0 |  |  |  |  | 0 |
Less revenue recognized | $ (161,109,000) | $ (137,653,000) | $ (145,421,000) | $ (118,928,000) | $ (166,896,000) | $ (152,468,000) | $ (137,361,000) | $ (121,180,000) |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adoption of Accounting Standards Codification 606, Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  | $ 12,244,000
Accumulated deficit | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adoption of Accounting Standards Codification 606, Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  | 12,244,000
Prior period adjustment related to the adoption of Accounting Standards Codification 606, Revenue from Contracts with Customers, tax |  |  |  |  |  |  |  |  |  |  | $ 0
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less revenue recognized |  |  |  |  |  |  |  |  |  | $ 16,000,000 |

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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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