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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