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CONVERTIBLE NOTES - Bridge Notes (Details)											1 Months Ended		3 Months Ended		12 Months Ended
	May 14, 2019 USD ($) D $ / shares shares	Apr. 16, 2019 USD ($) D $ / shares shares	Nov. 29, 2018 USD ($) D $ / shares	Sep. 17, 2018 USD ($) $ / shares	Sep. 17, 2018 USD ($) D $ / shares	Sep. 17, 2018 USD ($) $ / shares	Sep. 17, 2018 USD ($) $ / shares	Apr. 30, 2018 USD ($) $ / shares	Apr. 20, 2018 USD ($)	Feb. 12, 2018 USD ($) shares	Sep. 30, 2018 USD ($) item $ / shares	Apr. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) item $ / shares shares	Sep. 30, 2018 USD ($) item $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Apr. 30, 2019 $ / shares	Nov. 30, 2018 $ / shares	Sep. 20, 2018 $ / shares	Sep. 19, 2018 $ / shares	Aug. 31, 2018 USD ($) $ / shares	Jul. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 03, 2017 $ / shares
Debt Instrument [Line Items]
Proceeds from issuance of debt															$ 2,150,000	$ 3,850,000
Number of additional drawdowns completed | item														1
Total debt													$ 516,000		519,000	516,000
Warrant revaluation															(416,000)	(1,918,000)
Payments of financial advisor fees												$ 116,000
Loss on modification of warrants															(1,128,000)
Proceeds from convertible notes															2,150,000	3,850,000
Derivative asset (liability)													62,000			62,000
Loss on extinguishment of debt																(2,903,000)
Warrant liability canceled due to settlement of equity instruments																456,000
Number of shares converted from debt instrument (in shares) | shares										120,983
Conversion of convertible debt plus interest into common stock										$ 1,900,000					$ 7,553,000	2,356,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares															909,189
Wrote-off of debt discount with an offset to additional paid in capital															$ 731,000	210,000
Write-off debt derivative liability in conjunction with convertible note conversions															477,000	301,000
Long-term debt, net of current maturities													253,000		198,000	253,000
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net															(415,000)	267,000
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]
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				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								$ 11.25				$ 11.25							$ 7.50	$ 11.25
Proceeds from issuance of debt												$ 1,100,000
Stock rights issued (in shares) | shares | shares												243,224
Warrants, fair value								$ 1,100,000				$ 1,100,000
Conversion ratio												150
Exercise price (in dollars per share) | $ / shares								$ 11.25			$ 7.50	$ 11.25		$ 7.50
Warrant revaluation														$ 100,000
Advisor fees as a percentage of proceeds												7.00%
Proceeds from convertible notes												$ 1,100,000
Amended Warrants
Debt Instrument [Line Items]
Exercise price (in dollars per share) | $ / shares																	$ 5.40
Warrants term																	5 years
Advisor Warrants
Debt Instrument [Line Items]
Class of Warrant or Right, Term														4 years
Stock rights issued (in shares) | shares | shares												15,466
Warrants, fair value								$ 100,000				$ 100,000
Senior Secured Convertible Promissory Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 300,000	$ 300,000	$ 300,000	$ 300,000
Convertible debt, threshold consecutive trading days | D					10
Conversion price per share | $ / shares				$ 15.00	$ 15.00	$ 15.00	$ 15.00
Debt instrument, convertible, threshold trading days | item					5		5
Conversion ratio						1.65
Derivative liability from debt discount															$ 400,000
Conversion of convertible debt plus interest into common stock																2,800,000
Debt instrument, term				18 months
Percentage of principal outstanding						20.00%
Senior Secured Convertible Promissory Notes | Maximum
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000	$ 500,000	$ 500,000	$ 500,000
Quarter 3 2018 Warrants
Debt Instrument [Line Items]
Stock rights issued (in shares) | shares | shares														196,340
Exercise price (in dollars per share) | $ / shares																	$ 5.40
Warrants term																	5 years
Quarter 4 2018 Warrants
Debt Instrument [Line Items]
Proceeds from issuance of debt													$ 700,000
Stock rights issued (in shares) | shares | shares													300,115
Proceeds from convertible notes													$ 700,000
2018 Note Agreement
Debt Instrument [Line Items]
Debt instrument, face amount									$ 3,296,703
Exercise price (in dollars per share) | $ / shares								$ 4.50				$ 4.50						$ 2.25
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]
Conversion price per share | $ / shares								$ 11.25				$ 11.25
Stock rights issued (in shares) | shares | shares												15,466
Warrants, fair value								$ 100,000				$ 100,000
Exercise price (in dollars per share) | $ / shares								$ 11.25				$ 11.25
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													$ 5.40			$ 5.40
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares													300,115			300,115
Warrants term													5 years			5 years
Quarter 3 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt														$ 600,000
Derivative liability from debt discount											$ 100,000			100,000
Proceeds from convertible notes														600,000
Quarter 3 2018 Bridge Notes | Quarter 3 2018 Warrants
Debt Instrument [Line Items]
Proceeds from issuance of debt														700,000
Proceeds from convertible notes														700,000
April 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt												$ 600,000
Number of additional drawdowns completed | item											3
Derivative liability from debt discount								$ 100,000				100,000
Proceeds from convertible notes												600,000
April 2018 Bridge Notes | Convertible Promissory Note Warrants
Debt Instrument [Line Items]
Discount percentage									9.00%
May 2019 Bridge Notes
Debt Instrument [Line Items]
Stock rights issued (in shares) | shares | shares	154,343
Warrants, fair value	$ 900,000
Exercise price (in dollars per share) | $ / shares	$ 9.56
Warrants term	5 years
Quarter 4 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt													$ 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
Proceeds from convertible notes													400,000
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													$ 1,200,000			1,200,000
Debt discount													108,000			108,000
Proceeds from convertible notes													1,100,000		300,000
Quarter 4 2018 Bridge Notes | Amendment Agreement | Other current assets
Debt Instrument [Line Items]
Proceeds from issuance of debt															1,100,000
Proceeds from convertible notes															1,100,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Total debt													4,377,000		142,000	4,377,000
Long-term debt, net of current maturities
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			1,300,000
Warrants, fair value											$ 700,000			$ 700,000
Exercise price (in dollars per share) | $ / shares																					$ 11.25
Warrant revaluation																100,000
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													$ 5.40			$ 5.40
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares													300,115			300,115
Warrants term													5 years			5 years
Convertible Debt [Member] | Convertible Bridge Loan
Debt Instrument [Line Items]
Debt instrument, face amount															1,800,000
Interest rate (as a percent)											8.00%			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											$ 7.50			$ 7.50
Repayment Period														180 days
Debt discount and debt issuance costs as a reduction of the related debt															1,800,000
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											$ 164,000		$ 1,111,000	$ 164,000	1,796,000	$ 1,111,000
Debt issuance costs, net											$ 164,000			$ 164,000
Beneficial conversion feature															1,100,000
Net debt issuance costs and debt discounts															2,700,000
Loss on issuance of convertible notes															900,000
Debt premium on debt													$ 647,000			$ 647,000
Warrant liability canceled due to settlement of equity instruments															$ 4,400,000
Number of shares converted from debt instrument (in shares) | shares															1,900,766	93,334
Conversion of convertible debt plus interest into common stock																$ 200,000
Amortization of debt discount															$ 273,000	118,000
Amortization of debt premium															$ 167,000	170,000
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
Maximum borrowing amount			$ 1,318,681
Conversion price above the closing bid price of common stock | $ / shares			$ 0.75
Floor price | $ / shares			$ 2.25
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
Write off of debt premium with an offset to additional paid in capital																$ 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											$ 4.50			$ 4.50
Convertible Debt [Member] | Convertible Bridge Loan | Maximum | Amendment Agreement
Debt Instrument [Line Items]
Conversion price per share | $ / shares			$ 3.75
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			$ 1,300,000
Debt discount											133,000			133,000
Beneficial conversion feature															$ 500,000
Derivative liability from debt discount											100,000			100,000
Net debt issuance costs and debt discounts											1,400,000			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			495,941
Total debt											544,990			544,990
Convertible Debt [Member] | April 2018 Bridge Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt									$ 1,660,000
Total debt									1,824,176		1,500,000			1,500,000
Debt discount and debt issuance costs as a reduction of the related debt											$ 1,300,000			$ 1,300,000
Beneficial conversion feature												$ 1,700,000
Proceeds from convertible notes									$ 1,660,000
Convertible Debt [Member] | April 2019 Bridge Notes
Debt Instrument [Line Items]
Discount percentage		9.00%
Repayment Period		180 days
Proceeds from issuance of debt		$ 900,000
Total debt		1,000,000
Debt discount and debt issuance costs as a reduction of the related debt		1,000,000
Debt discount		$ 100,000
Stock rights issued (in shares) | shares | shares		147,472
Warrants, fair value		$ 1,000,000
Exercise price (in dollars per share) | $ / shares		$ 5.40
Beneficial conversion feature		$ 900,000
Net debt issuance costs and debt discounts		2,000,000
Loss on issuance of convertible notes															$ 1,000,000
Proceeds from convertible notes		$ 900,000
Warrants term		5 years
Convertible Debt [Member] | April 2019 Bridge Notes | 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
Floor price | $ / shares		2.25
Convertible Debt [Member] | April 2019 Bridge Notes | Maximum | Amendment Agreement
Debt Instrument [Line Items]
Conversion price per share | $ / shares		$ 3.75
Convertible Debt [Member] | May 2019 Bridge Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,100,000
Conversion threshold percentage of stock price trigger	80.00%
Convertible debt, threshold consecutive trading days | D	10
Conversion price per share | $ / shares	$ 7.12
Repayment Period	180 days
Proceeds from issuance of debt	$ 1,000,000
Debt discount and debt issuance costs as a reduction of the related debt	1,100,000
Debt discount	100,000
Beneficial conversion feature	900,000
Net debt issuance costs and debt discounts	2,000,000
Loss on issuance of convertible notes	$ 900,000
Original issue discount (as a percent)	9
Proceeds from convertible notes	$ 1,000,000
Floor price | $ / shares	$ 2.25

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