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STOCKHOLDERS' EQUITY (Remaining Warrants) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | May 31, 2019 | Sep. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | Feb. 28, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant, number of securities called by warrants |  |  |  |  |  |  |  | 909,189 |  |  |  |  |
Loss on modification of warrants |  |  |  |  |  |  |  | $ (1,128,000) |  |  |  |  |
Warrants exercised |  |  |  |  |  |  |  | 20,000 |  |  |  |  |
Change in fair value due to repricing |  |  |  |  |  |  |  | $ (416,000) | $ (1,918,000) |  |  |  |
Loss on issuance of convertible notes |  |  |  |  |  |  |  | $ 1,870,000 | 1,328,000 |  |  |  |
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 |  | $ 7.50 | $ 11.25 |  | $ 7.50 | $ 7.50 |  |  |  |  |  |
Warrants, fair value | $ 1,100,000 |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Warrants exercised |  |  |  |  |  |  |  | 51,708 |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  |  | $ 279,000 |  |  |  |  |
Intrinsic value of warrants exercisable |  |  |  |  |  |  |  | $ 128,000 |  |  |  |  |
Change in fair value due to repricing |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
April 2018 Warrants, First Half |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, term | 5 years |  |  | 5 years |  | 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 |  |  |
Warrants term |  |  |  |  |  |  |  | 5 years |  |  |  |  |
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 |  |  | 1 year |  | 1 year |  |  |  |  |  |  |
Advisor Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) |  |  |  | 15,466 |  |  |  |  |  |  |  |  |
Warrants, fair value | $ 100,000 |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Class of warrant or right, term |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Quarter 3 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) |  |  |  |  |  | 196,340 |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 5.40 |  |  |
Warrants term |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Warrants exercised |  |  |  |  |  |  |  | 53,610 |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  |  | $ 289,000 |  |  |  |  |
Intrinsic value of warrants exercisable |  |  |  |  |  |  |  | $ 133,382 |  |  |  |  |
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 |
Warrants, fair value |  |  | $ 700,000 |  |  | $ 700,000 | $ 700,000 |  |  |  |  |  |
Change in fair value due to repricing |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Modified exercise price |  |  | $ 7.50 |  |  |  |  |  |  |  |  |  |
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] | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, term |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Warrants Not Assumed In Merger, Expiring November 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant, number of securities called by warrants |  |  |  |  |  |  |  | 75,788 |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 5.40 |  |  |  |  |
Warrants Not Assumed In Merger, Expiring December 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant, number of securities called by warrants |  |  |  |  |  |  |  | 51,282 |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 5.40 |  |  |  |  |
Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) |  |  |  |  | 300,115 |  |  |  |  |  |  |  |
Warrants exercised |  |  |  |  |  |  |  | 173,045 |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  |  |  | $ 934,000 |  |  |  |  |
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 |  |  |  | 300,115 |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 5.40 |  |  |  | $ 5.40 |  |  |  |
Warrants, fair value |  |  |  |  | $ 700,000 |  |  |  | $ 700,000 |  |  |  |
Warrants term |  |  |  |  | 5 years |  |  |  | 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, fair value |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Warrants term |  |  |  |  |  |  |  |  |  | 5 years |  |  |
May 2019 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) |  | 154,343 |  |  |  |  |  |  |  |  |  |  |
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, fair value |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |
Warrants term |  | 5 years |  |  |  |  |  |  |  |  |  |  |
2018 Note Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.50 |  |  | $ 4.50 |  |  |  |  |  |  | $ 2.25 |  |
2018 Note Agreement | April 2018 Warrants, First Half |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, term |  |  |  |  |  |  |  | 1 year |  |  |  |  |
2018 Note Agreement | April 2018 Warrants, Second Half |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, 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 |  |  | $ 11.25 |  |  |  |  |  |  |  |  |
Warrants, fair value | $ 100,000 |  |  | $ 100,000 |  |  |  |  |  |  |  |  |

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