Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND OTHER INFORMATION (Impact of Adoption of Accounting Standard) (Details)

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BASIS OF PRESENTATION AND OTHER INFORMATION (Impact of Adoption of Accounting Standard) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated deficit $ (2,233,501) $ (949,334)
Cumulative Effect, Period of Adoption, Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated deficit   $ (3,000)