ACCRUED EXPENSES - Narrative (Details) - USD ($) $ in Thousands	Sep. 09, 2019	Aug. 02, 2019	Sep. 30, 2020	Dec. 31, 2019	Nov. 02, 2019	Aug. 03, 2019
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Severance to former Executives and other employees			$ 0	$ 378
Former Chief Financial Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Separation Agreement, period of separation payments and benefits agreed to	12 months
Severance to former Executives and other employees	$ 300
Former Chief Medical Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Separation Agreement, period of separation payments and benefits agreed to		6 months
Severance to former Executives and other employees						$ 300
Separation payments		$ 200
Consulting fees and transition expenses					$ 100