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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounting Policies [Abstract]        
Service fee credits $ 59,000,000      
Extended payment terms for lease billings 10,000,000   $ 10,000,000  
Extended payment terms for trade receivables 65,000,000   65,000,000  
Extended payment terms for trade receivables that would have been due in next quarter 37,000,000   37,000,000  
Bad debt expense 2,300,000   5,500,000  
Lessor, Lease, Description [Line Items]        
Sales-type leases credit losses 0   900,000  
Sales-type leases credit losses 0   900,000  
Available-for-sales debt securities credit losses $ 0 $ 0 $ 1,200,000 $ 0
Minimum        
Lessor, Lease, Description [Line Items]        
Sales-type leases terms 24 months   24 months  
Maximum        
Lessor, Lease, Description [Line Items]        
Sales-type leases terms 84 months   84 months