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CONVERTIBLE NOTES - Bridge Notes (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 USD ($) shares | Nov. 29, 2018 USD ($) D $ / shares shares | Sep. 17, 2018 USD ($) | Apr. 20, 2018 USD ($) | Apr. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($) item shares | Sep. 30, 2018 USD ($) item $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | Jan. 02, 2019 | Sep. 20, 2018 $ / shares | Sep. 19, 2018 $ / shares | Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Aug. 31, 2017 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | 399,000 | $ 516,000 |  |  | $ 516,000 |  |  |  |  |  |
Warrant revaluation and modification |  |  |  |  |  | (240,000) |  |  | $ (261,000) |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | $ 62,000 |
Debt premium on debt |  |  |  |  |  |  | $ 900,000 |  |  | 900,000 |  |  |  |  |  |
Warrant liability canceled due to settlement of equity instruments |  |  |  |  |  |  |  |  | $ 456,000 |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares | 120,983 |  |  |  |  |  | 93,333 |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock | $ 1,900,000 |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  | 917,563 |  |  |  |  |  |  |  |  |  |
Wrote-off of debt discount with an offset to additional paid in capital |  |  |  |  |  | $ (315,000) |  |  |  |  |  |  |  |  |  |
Write-off debt derivative liability in conjunction with convertible note conversions |  |  |  |  |  | 39,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, net of current maturities |  |  |  |  |  | 238,000 | $ 253,000 |  |  | 253,000 |  |  |  |  |  |
Bridge Notes Redemption Feature [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset (liability) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off debt derivative liability in conjunction with convertible note conversions |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Convertible Promissory Note Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  | $ 21.00 |  |  |  |  |  |  |  |  |  | $ 45.00
April 2018 Warrants, First Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
April 2018 Warrants, Second Half |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
April 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  | 243,223 |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 7.50 | $ 11.25 |  |  |
Payments of financial advisor fees |  |  |  |  | $ 116,000 |  |  |  |  |  |  |  |  |  |  |
Advisor fees as a percentage of proceeds |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Advisor Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  | 15,466 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Promissory Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |
Quarter 3 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  |  | 196,337 |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |
Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  |  |  | 300,114 |  |  |  |  |  |  |  |  |
Debt discounts written-off as a result of the extinguishment of certain Bridge Notes |  |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |
2018 Note Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 3,296,703 |  |  |  |  |  |  |  |  |  |  |  |
2018 Note Agreement | April 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  | $ 11.25 |  |  |  |  |  |  |  |  |  |  |
2018 Note Agreement | Advisor Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | shares | shares |  |  |  |  | 15,466 |  |  |  |  |  |  |  |  |  |  |
Convertible Bridge Loan | Quarter 4 2018 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value |  |  |  |  |  |  | $ 700,000 |  |  | $ 700,000 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  |  | 300,114 |  |  | 300,114 |  |  |  |  |  |
Quarter 3 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
April 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Derivative liability from debt discount |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Quarter 4 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  | $ 1,400,000 |  |  | $ 1,400,000 |  |  |  |  |  |
Debt discount and debt issuance costs as a reduction of the related debt |  |  |  |  |  |  | 1,100,000 |  |  | 1,100,000 |  |  |  |  |  |
Write off of debt premium with an offset to additional paid in capital |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Quarter 4 2018 Bridge Notes | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 1,100,000 |  |  | 300,000 |  |  |  |  |  |
Number of additional drawdowns completed | item |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 1,100,000 | $ 1,200,000 |  |  | 1,200,000 |  |  |  |  |  |
Debt discount |  |  |  |  |  |  | 108,000,000 |  |  | 108,000,000 |  |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, carrying amount |  |  |  |  |  | $ 3,129,000 | 4,377,000 |  |  | 4,377,000 |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  |  | 1,061,069 |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  | $ 3,700,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, net of current maturities |  |  |  |  |  | $ 0 | 0 |  |  | 0 |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Discount percentage |  |  |  |  |  | 9.00% |  | 9.00% |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | item |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  | $ 7.50 |  |  |  |  |  |  |  |
Repayment Period |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |
Early repayment trigger, amount of gross proceeds |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Period To File Registration Statement |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Percentage per month charged as damages if registration statement not filed by deadline |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  | 1,053,000 | 1,111,000 | $ 164,000 |  | 1,111,000 |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  |  |  | $ 164,000 |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |
Debt, carrying amount |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt premium on debt |  |  |  |  |  | 91,000 | $ 647,000 |  |  | $ 647,000 |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  | 1,112,762 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  | 58,000 |  |  |  |  |  |  |  |  |  |
Amortization of debt premium |  |  |  |  |  | $ 160,000 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion threshold percentage of stock price trigger |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, threshold consecutive trading days | D |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing amount |  | $ 1,318,681 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor price | $ / shares |  | $ 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, carrying amount |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 115.00% |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  | $ 4.50 |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan | Maximum | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  | $ 3.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Quarter 3 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount percentage |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  | $ 133,000 |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | July 2018 Bridge Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.5 |  |
Convertible Debt [Member] | April 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount percentage |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 1,660,000 |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 1,824,176 |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Quarter 4 2018 Bridge Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  |  | 1,019,430 |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |

X
- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt derivative liability in conjunction with convertible note conversions. + References No definition available. + Details
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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions. + References No definition available. + Details
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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from write-off debt premiums in conjunction with convertible note conversions. + References No definition available. + Details
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- Definition Advisor fees as a percentage of proceeds + References No definition available. + Details
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- Definition The duration of repayment of notes from the date of issuance to achieve the conversion price. + References No definition available. + Details
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- Definition The minimum price per share of the conversion feature embedded in the debt instrument. + References No definition available. + Details
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- Definition Represents the period to file registration statement. + References No definition available. + Details
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