STOCKHOLDERS' EQUITY (Remaining Warrants) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended
	Apr. 30, 2019	Sep. 30, 2018	Apr. 30, 2018	Sep. 30, 2018	Jun. 30, 2021	May 31, 2019	Dec. 31, 2018	Feb. 28, 2018
Class of Stock [Line Items]
Class of warrant, number of securities called by warrants					831,901
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
Warrants exercised					43,138
Proceeds from issuance of warrants					$ 0.2
Intrinsic value of warrants exercisable					$ 0.1
April 2018 Warrants, First Half
Class of Stock [Line Items]
Class of warrant or right, term	1 year		5 years
Amended April 2018 Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 5.40
April 2018 Warrants, Second Half
Class of Stock [Line Items]
Class of warrant or right, term	5 years		1 year
Quarter 3 2018 Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 5.40
Warrants term	5 years
Warrants exercised					30,862
Proceeds from issuance of warrants					$ 0.2
Intrinsic value of warrants exercisable					$ 0.1
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		$ 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]
Class of warrant or right, 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 | 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)						$ 5.40
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