STOCKHOLDERS' EQUITY (Series C Warrants) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2017
Class of Stock [Line Items]
Underlying shares (in shares)	906,769		906,769
Deemed dividend	$ 0	$ 0		$ 0
Series C Warrants [Member]
Class of Stock [Line Items]
Underlying shares (in shares)						130,857
Exercise price (in dollars per share)						$ 24.45
Warrants exercised		25,037		25,037
Proceeds from issuance of warrants		$ 56,000		$ 56,000
Intrinsic value of warrants exercised in period		$ 43,000		$ 43,000
Class of Warrant or Right, Outstanding	0		0		0
2018 Inducement Agreement
Class of Stock [Line Items]
Deemed dividend			$ 3,344,000