NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
NATURE OF BUSINESS AND BASIS OF PRESENTATION
Accumulated deficit	$ (340,723)	$ (295,456)

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant