STOCKHOLDERS' EQUITY (Remaining Warrants) (Details) - USD ($)	1 Months Ended			12 Months Ended
	Apr. 30, 2019	Sep. 30, 2018	Apr. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	May 31, 2019	Apr. 16, 2019	Mar. 31, 2019	Dec. 31, 2018	Feb. 28, 2018
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants				906,497
Loss on modification of warrants					$ (1,128,000)
Creditor Warrants Relating to Secured Debt
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants										7,207
Exercise price (in dollars per share)										$ 112.50
April 2018 Warrants
Class of Stock [Line Items]
Stock rights issued (in shares)			243,224
Exercise price (in dollars per share)			$ 11.25
Loss on modification of warrants					$ 1,100,000
Warrants exercised					51,708
Proceeds from issuance of warrants					$ 279,000
Intrinsic value of warrants exercisable					128,000
April 2018 Warrants, First Half
Class of Stock [Line Items]
Class of warrant or right, term	1 year		5 years
Amended Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)							$ 5.40
Warrants term							5 years
Amended April 2018 Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 5.40							$ 7.50
Loss on modification of warrants					$ 700,000
Amended Q3 2018 Warrants [Member]
Class of Stock [Line Items]
Loss on modification of warrants				$ 400,000
April 2018 Warrants, Second Half
Class of Stock [Line Items]
Class of warrant or right, term			1 year
Warrants term	5 years
Quarter 3 2018 Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 5.40							$ 7.50
Warrants exercised					53,610
Proceeds from issuance of warrants					$ 290,000
Intrinsic value of warrants exercisable					$ 133,000
Quarter 3 2018 Warrants | Convertible Debt [Member]
Class of Stock [Line Items]
Number of Warrants issued				196,340
Exercise price (in dollars per share)				$ 11.25
Modified exercise price		$ 7.50
Quarter 3 2018 Warrants, First Half [Member]
Class of Stock [Line Items]
Class of warrant or right, term	1 year
Quarter 3 2018 Warrants, First Half [Member] | Convertible Debt [Member]
Class of Stock [Line Items]
Class of warrant or right, term				5 years
Quarter 3 2018 Warrants, Second Half [Member]
Class of Stock [Line Items]
Warrants term	5 years
Quarter 3 2018 Warrants, Second Half [Member] | Convertible Debt [Member]
Class of Stock [Line Items]
Class of warrant or right, term				1 year
Quarter 4 2018 Warrants
Class of Stock [Line Items]
Warrants exercised					173,045
Proceeds from issuance of warrants					$ 935,000
Intrinsic value of warrants exercisable					$ 489,000
Quarter 4 2018 Warrants | Convertible Debt [Member]
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants									300,115
Exercise price (in dollars per share)									$ 5.40
Warrants term									5 years
April 2019 Bridge Notes | Convertible Debt [Member]
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants	147,472
Exercise price (in dollars per share)	$ 5.40
Warrants term	5 years
May 2019 Warrants | Convertible Debt [Member]
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants						154,343
Exercise price (in dollars per share)						$ 9.56
Warrants term						5 years
2018 Note Agreement | Advisor Warrants
Class of Stock [Line Items]
Stock rights issued (in shares)			15,466
Exercise price (in dollars per share)			$ 11.25