REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Narrative (Details) - USD ($) $ in Thousands	48 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to accumulated deficit	$ 1,015,201	$ 547,540
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Governmental rebates	6,300
Increase to accumulated deficit	$ 6,303	$ 5,098	$ 800