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CONVERTIBLE BRIDGE NOTES (Conversion and Settlement of New Bridge Notes) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 17, 2018 | Feb. 12, 2018 | Jun. 29, 2017 | Apr. 28, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 16, 2019 | Nov. 30, 2017 | Oct. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares callable by warrant (in shares) |  |  |  |  |  |  |  |  | 1,966,275 |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 2,008,000 |  |  |  |
Total debt |  |  |  |  |  |  | 516,000 | $ 3,416,000 |  |  |
Debt converted |  | $ 1,900,000 |  |  |  |  | 3,191,000 |  |  |  |
Number of shares converted from debt instrument (in shares) |  | 1,814,754 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt and induced conversion of convertible bridge notes |  |  |  |  |  |  | 1,328,000 |  |  |  |
Loss on extinguishment of debt related to unamortized discount |  |  |  |  |  |  | (376,000) | 1,391,000 |  |  |
(Accretion) amortization of deferred financing costs, debt discounts and debt premiums |  |  |  |  |  |  | (21,000) | 1,898,000 |  |  |
Convertible promissory notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000,000 |  |  |  |  |  |  |  |  |  |
Debt converted | $ 2,800,000 |  |  |  |  |  | 2,200,000 |  |  |  |
Amortization for the next twelve months |  |  |  |  |  |  | 100,000 |  |  |  |
Amortization of debt discount thereafter |  |  |  |  |  |  | $ 0 |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  | 4,373,439 |  |  |  |
Bridge Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  | $ 2,436,551 |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 2,000,000 |  |  |  |  |  |  |
Redemption premium |  |  |  | $ 400,000 |  |  |  |  |  |  |
Premium rate changed upon settlement of debt |  |  |  | 20.00% |  |  |  |  |  |  |
Accrued interest |  |  |  | $ 36,551 |  |  |  |  |  |  |
Repayments of debt |  |  |  | 1,536,551 |  |  |  |  |  |  |
Debt converted |  |  |  | $ 900,000 | $ 900,000 | $ 900,000 |  |  |  |  |
Loss on extinguishment of debt and induced conversion of convertible bridge notes |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Loss on extinguishment of debt related to unamortized discount |  |  |  |  |  |  | 400,000 |  |  |  |
Bridge Loan | Convertible Bridge Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  | $ 695,000 |  |  |
(Accretion) amortization of deferred financing costs, debt discounts and debt premiums |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares callable by warrant (in shares) |  |  |  |  | 400 |  |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 1,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 6,000,000 |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  | $ 2.50 |  |  |  |  | $ 1.40 | $ 2.50
Common Stock |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares callable by warrant (in shares) |  |  |  |  | 400 |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  | 1,414,700 |  |  |  | 3,787,300 |  |  |  |
Common Stock | Bridge Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  | 359,999 | 359,999 | 359,999 |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 2.50 |  |  |  |  |  |  |
Warrants issued on conversion (in shares) |  |  |  | 359,999 |  |  |  |  |  |  |
Loss on extinguishment of debt and induced conversion of convertible bridge notes |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Common Stock | Bridge Loan | Convertible Bridge Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  | $ 192,000 |  |  |  |  |  |  |  |
Debt converted |  |  | $ 695,000 |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  | 155,639 |  |  |  |  |  |  |  |
Public Stock Offering |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) |  |  |  |  | 6,000 |  |  |  |  |  |
Sale of stock, number of warrants per unit (in shares) |  |  |  | 1 | 1 |  |  |  |  |  |
Public Stock Offering | Preferred Class B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) |  |  |  |  | 6,000 |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of warrants per unit (in shares) |  |  |  |  | 1 |  |  |  |  |  |

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