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REVENUE RECOGNITION - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Capitalized Contract Cost [Line Items]      
Deferred revenue $ 21,161   $ 25,452
Deferred Revenue, Revenue Recognized 25,300    
Amortization of Deferred Charges 5,000 $ 7,000  
Revenue from Contract with Customers, Revenue constrained and ti be recognized in future periods 13,000   13,700
Prepaid expenses and other current assets      
Capitalized Contract Cost [Line Items]      
Deferred Costs 2,800   2,900
Other non-current assets      
Capitalized Contract Cost [Line Items]      
Deferred Costs $ 10,500   $ 11,000