CONVERTIBLE NOTES - Bridge Notes (Details)									1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 29, 2018 USD ($) D $ / shares	Sep. 17, 2018 USD ($) $ / shares	Sep. 17, 2018 USD ($) D $ / shares	Sep. 17, 2018 USD ($) item $ / shares	Sep. 17, 2018 USD ($) $ / shares	Sep. 17, 2018 USD ($) $ / shares	Feb. 12, 2018 USD ($) shares	Oct. 03, 2017 $ / shares shares	Apr. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) item $ / shares shares	Sep. 30, 2018 USD ($) item $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Nov. 30, 2018 $ / shares	Sep. 20, 2018 $ / shares	Sep. 19, 2018 $ / shares	Aug. 31, 2018 USD ($) $ / shares	Jul. 31, 2018 USD ($)	Apr. 20, 2018 USD ($)	Oct. 31, 2017 USD ($)	Aug. 31, 2017 USD ($) shares	Aug. 17, 2017 USD ($)	Jun. 29, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from convertible notes												$ 3,850,000	$ 1,365,000
Number of additional drawdowns completed | item											1
Total debt										$ 516,000		516,000	3,416,000
Debt discount										1,100,000		1,100,000
Warrants, fair value																							$ 211,000
Warrant revaluation and modification												(1,918,000)	226,000
Payments of financial advisor fees									$ 116,000
Derivative asset (liability)										62,000		62,000
Debt premium on debt										$ 600,000		600,000
Loss on extinguishment of debt												(2,903,000)
Bridge Notes plus interest converted												456,000
Number of shares converted from debt instrument (in shares) | shares							1,814,754
Conversion of debt into stock							$ 1,900,000					$ 3,191,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares										13,763,608		13,763,608
Amortization of debt discount												$ 100,000
Amortization of debt premium												200,000
Wrote-off of debt discount with an offset to additional paid in capital												210,000
Write-off debt derivative liability in conjunction with convertible note conversions												301,000
Long-term debt, net of current maturities										$ 253,000		253,000	$ 2,829,000
Bridge Notes Beneficial Conversion Features
Debt Instrument [Line Items]
Derivative asset (liability)										(15,000)		(15,000)
Bridge Notes Redemption Feature [Member]
Debt Instrument [Line Items]
Derivative asset (liability)										$ 30,000		$ 30,000
Convertible Promissory Note Warrants
Debt Instrument [Line Items]
Class of Warrant or Right, Term								5 years
Warrants, fair value																					$ 15,000
Exercise price (in dollars per share) | $ / shares								$ 3.00		$ 1.40		$ 1.40
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares								10,000													10,000
April 2018 Warrants, First Half
Debt Instrument [Line Items]
Class of Warrant or Right, Term									5 years		5 years	5 years
April 2018 Warrants, Second Half
Debt Instrument [Line Items]
Class of Warrant or Right, Term									1 year		1 year	1 year
April 2018 Warrants
Debt Instrument [Line Items]
Conversion price per share | $ / shares									$ 0.75						$ 0.50	$ 0.75
Proceeds from convertible notes									$ 1,100,000
Stock rights issued (in shares) | shares | shares									3,648,352
Warrants, fair value									$ 1,100,000
Conversion ratio									150
Exercise price (in dollars per share) | $ / shares									$ 0.75		$ 0.50
Warrant revaluation and modification											$ 100,000
Advisor fees as a percentage of proceeds									7.00%
Advisor Warrants
Debt Instrument [Line Items]
Class of Warrant or Right, Term											4 years
Conversion price per share | $ / shares									$ 0.75
Stock rights issued (in shares) | shares | shares									232,000
Warrants, fair value									$ 100,000
Convertible promissory notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 300,000,000,000	$ 300,000,000,000	$ 300,000,000,000	$ 300,000,000,000	$ 300,000,000,000
Convertible debt, threshold consecutive trading days | D			10
Conversion price per share | $ / shares		$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Debt instrument, convertible, threshold trading days | item			5	5
Debt discount		$ 400,000	$ 400,000	$ 400,000	$ 400,000	$ 400,000				$ 100,000		$ 100,000
Conversion ratio					1.65
Derivative liability from debt discount										400,000		$ 400,000
Number of shares converted from debt instrument (in shares) | shares												4,373,439
Conversion of debt into stock						2,800,000						$ 2,200,000
Debt instrument, term		18 months
Percentage of principal outstanding					20.00%
Wrote-off of debt discount with an offset to additional paid in capital												300,000
Write-off debt derivative liability in conjunction with convertible note conversions												300,000
Long-term debt, net of current maturities										600,000		600,000
Convertible promissory notes | Maximum
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000,000,000	$ 500,000,000,000	$ 500,000,000,000	$ 500,000,000,000	$ 500,000,000,000
Amortization of debt discount												$ 100,000
Quarter 3 2018 Warrants
Debt Instrument [Line Items]
Stock rights issued (in shares) | shares | shares											2,945,055
Quarter 4 2018 Warrants
Debt Instrument [Line Items]
Proceeds from convertible notes										$ 700,000
Stock rights issued (in shares) | shares | shares										4,501,712
2018 Note Agreement
Debt Instrument [Line Items]
Debt instrument, face amount																			$ 3,296,703
Exercise price (in dollars per share) | $ / shares									$ 0.30					$ 0.15
2018 Note Agreement | April 2018 Warrants, First Half
Debt Instrument [Line Items]
Class of Warrant or Right, Term												1 year
2018 Note Agreement | April 2018 Warrants, Second Half
Debt Instrument [Line Items]
Class of Warrant or Right, Term												5 years
2018 Note Agreement | Advisor Warrants
Debt Instrument [Line Items]
Stock rights issued (in shares) | shares | shares									232,000
Warrants, fair value									$ 100,000
Exercise price (in dollars per share) | $ / shares									$ 0.75
Convertible Bridge Loan
Debt Instrument [Line Items]
Debt premium on debt										$ 900,000		$ 900,000
Write-off debt derivative liability in conjunction with convertible note conversions												100,000
Convertible Bridge Loan | Quarter 4 2018 Warrants
Debt Instrument [Line Items]
Warrants, fair value										$ 700,000		$ 700,000
Exercise price (in dollars per share) | $ / shares										$ 0.36		$ 0.36
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares										4,501,712		4,501,712
Warrants term										5 years
Quarter 3 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from convertible notes											$ 600,000
Derivative liability from debt discount											100,000
Quarter 3 2018 Bridge Notes | Quarter 3 2018 Warrants
Debt Instrument [Line Items]
Proceeds from convertible notes											$ 700,000
April 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from convertible notes									$ 600,000
Number of additional drawdowns completed | item											3
Derivative liability from debt discount									100,000
Quarter 4 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from convertible notes										$ 400,000
Number of additional drawdowns completed | item										1
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
Beneficial conversion feature										1,100,000
Loss on issuance of convertible notes										300,000
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 convertible notes										$ 1,100,000		300,000
Number of additional drawdowns completed | item										2
Total debt										$ 1,200,000		1,200,000
Debt discount										108,000		108,000
Quarter 4 2018 Bridge Notes | Amendment Agreement | Other current assets
Debt Instrument [Line Items]
Proceeds from convertible notes												1,100,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount										$ 125,000		$ 125,000
Interest rate (as a percent)										6.00%		6.00%
Total debt										$ 4,377,000		$ 4,377,000								$ 41,666		$ 143,041
Convertible Debt [Member] | Quarter 3 2018 Warrants
Debt Instrument [Line Items]
Debt discount and debt issuance costs as a reduction of the related debt											$ 1,300,000
Warrants, fair value											$ 700,000
Exercise price (in dollars per share) | $ / shares											$ 0.50						$ 0.75
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares											2,945,055
Convertible Debt [Member] | Quarter 4 2018 Warrants
Debt Instrument [Line Items]
Warrants, fair value										$ 700,000		$ 700,000
Exercise price (in dollars per share) | $ / shares										$ 0.36		$ 0.36
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares										4,501,712		4,501,712
Warrants term										5 years
Convertible Debt [Member] | Convertible Bridge Loan
Debt Instrument [Line Items]
Debt instrument, face amount										$ 1,800,000		$ 1,800,000
Interest rate (as a percent)											8.00%
Discount percentage											9.00%
Conversion threshold percentage of stock price trigger											80.00%
Convertible debt, threshold consecutive trading days | item											10
Conversion price per share | $ / shares											$ 0.50
Total debt											$ 1,500,000
Debt discount and debt issuance costs as a reduction of the related debt										1,800,000		1,800,000
Early repayment trigger, amount of gross proceeds											$ 7,000,000
Percentage per month charged as damages if registration statement not filed by deadline											1.00%
Debt discount											$ 164,000
Debt issuance costs, net											$ 164,000
Beneficial conversion feature												1,100,000
Net debt issuance costs and debt discounts										2,700,000		2,700,000
Loss on issuance of convertible notes												900,000
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
Debt discount	$ 3,100,000
Beneficial conversion feature	1,000,000
Net debt issuance costs and debt discounts										$ 5,600,000		5,600,000
Loss on issuance of convertible notes												1,300,000
Maximum borrowing amount	$ 1,318,681,000,000
Conversion price above the closing bid price of common stock | $ / shares	$ 0.05
Floor price | $ / shares	$ 0.15
Debt, carrying amount	$ 3,300,000
Fair value of convertible debt	4,200,000
Debt premium on debt	900,000
Loss on extinguishment of debt	2,900,000
Bridge Notes plus interest converted												$ 200,000
Number of shares converted from debt instrument (in shares) | shares												1,400,000
Write off of debt premium with an offset to additional paid in capital												$ 100,000
Debt discounts written-off as a result of the extinguishment of certain Bridge Notes												$ 3,100,000
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement | Bridge Notes Beneficial Conversion Features
Debt Instrument [Line Items]
Beneficial conversion feature	0
Convertible Debt [Member] | Convertible Bridge Loan | Amendment Agreement | Bridge Notes Redemption Feature [Member]
Debt Instrument [Line Items]
Derivative asset (liability)	$ 0
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											$ 0.30
Convertible Debt [Member] | Convertible Bridge Loan | Maximum | Amendment Agreement
Debt Instrument [Line Items]
Conversion price per share | $ / shares	$ 0.25
Derivative liability from debt discount	$ 100,000
Convertible Debt [Member] | Quarter 3 2018 Bridge Notes
Debt Instrument [Line Items]
Debt discount and debt issuance costs as a reduction of the related debt											$ 1,300,000
Debt discount											133,000
Beneficial conversion feature												$ 500,000
Derivative liability from debt discount											100,000
Net debt issuance costs and debt discounts											1,400,000
Loss on issuance of convertible notes											100,000
Convertible Debt [Member] | July 2018 Bridge Notes
Debt Instrument [Line Items]
Debt instrument, face amount																		$ 348,104
Total debt																		$ 382,526
Convertible Debt [Member] | August 2018 Bridge Notes
Debt Instrument [Line Items]
Debt instrument, face amount																	$ 495,955
Total debt																	$ 545,005
Convertible Debt [Member] | September 2018 Bridge Notes
Debt Instrument [Line Items]
Debt instrument, face amount											495,941
Total debt											544,990
Convertible Debt [Member] | April 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from convertible notes											1,660,000
Total debt											1,824,176
Debt discount and debt issuance costs as a reduction of the related debt											$ 1,300,000
Beneficial conversion feature									$ 1,700,000