ORGANIZATION AND BUSINESS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 03, 2020	Dec. 31, 2019	Mar. 29, 2019
Debt Instrument [Line Items]
Accumulated deficit	$ 359,066			$ 346,827
Net cash used in operating activities	9,247	$ 7,496
Cash and cash equivalents	10,233			$ 272
Working capital	$ 4,800
Aspire Capital Fund, LLC
Debt Instrument [Line Items]
Number of shares issued (in shares)	48,238,893
Consideration received on sale of stock	$ 32,000
Private Placement | Aspire Capital Fund, LLC
Debt Instrument [Line Items]
Purchase amount of shares authorized			$ 30,000		$ 30,000
Number of shares issued (in shares)	44,227,890