SHARE-BASED COMPENSATION EXPENSE - Non-Cash Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total Stock Compensation
Allocated Share-based Compensation Expense	$ 9	$ 48	$ 42	$ 116
Research and development costs
Total Stock Compensation
Allocated Share-based Compensation Expense	0	5	0	17
Research and development costs | Stock options
Total Stock Compensation
Allocated Share-based Compensation Expense	0	2	0	6
Research and development costs | Restricted stock units
Total Stock Compensation
Allocated Share-based Compensation Expense	0	3	0	11
General and administrative costs
Total Stock Compensation
Allocated Share-based Compensation Expense	9	43	42	99
General and administrative costs | Stock options
Total Stock Compensation
Allocated Share-based Compensation Expense	0	3	0	10
General and administrative costs | Restricted stock units
Total Stock Compensation
Allocated Share-based Compensation Expense	$ 9	$ 40	$ 42	$ 89