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REVENUE RECOGNITION (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue recognized that was previously recorded as deferred revenue									$ 84,000,000
Revenue recognized in 2020									12,000,000
Revenue recognized in 2021									5,000,000
Revenue recognized in 2022 and beyond									1,000,000
Deferred sales commissions accrued	$ 2,700,000								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	$ (166,896,000)	$ (152,468,000)	$ (137,361,000)	$ (121,180,000)	$ (146,212,000)	$ (74,629,000)	$ (55,733,000)	$ (53,368,000)
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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