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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 |  |  |  |  |

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