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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details)										1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		33 Months Ended
	Jun. 26, 2020 shares	May 13, 2020 USD ($) shares	Apr. 08, 2020 shares	Mar. 26, 2020 USD ($) D $ / shares shares	Jan. 14, 2020 shares	Aug. 09, 2019 shares	Feb. 01, 2019 shares	Sep. 14, 2018 shares	Sep. 07, 2018 USD ($) $ / shares shares	Apr. 30, 2020	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Sep. 30, 2020 USD ($) shares	Apr. 06, 2020 shares	Jan. 29, 2019 USD ($)	Jan. 01, 2019 shares	Dec. 20, 2018 shares	Sep. 06, 2018 shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)											150,000,000		150,000,000		150,000,000		150,000,000			250,000,000	150,000,000
Number of shares converted (in shares)												0
Common stock, shares outstanding (in shares)				8,870,129							16,676,916		16,676,916		7,898,117		16,676,916					1,543,724
Shares sold in offering (in shares)		550,000
Issuance of common stock, net of issuance costs | $													$ 6,921,000	$ 5,171,000
Conversion of convertible debt into common stock | $													2,176,000	7,390,000
Conversion of debt into stock | $													$ 2,176,000	$ 7,390,000
Warrant exercises in period														310,200
Proceeds from exercise of warrants | $														$ 1,575,000
Shares issued (in shares)											16,676,916		16,676,916		7,898,117		16,676,916
Common Stock
Class of Stock [Line Items]
Conversion of convertible notes into common stock (in shares)												52,748	3,908,145	2,439,173
Common stock issued in connection with the conversion of convertible notes											0		3,908,145
Conversion of convertible debt into common stock | $											$ 0	$ 100,000	$ 2,200,000	$ 7,400,000
Number of shares converted from debt instrument (in shares)												52,748	3,908,145	2,439,173
Conversion of debt into stock | $											$ 0	$ 100,000	$ 2,200,000	$ 7,400,000
Common Stock
Class of Stock [Line Items]
Common stock issued for exercise of warrants												0		310,200
Preferred Class B
Class of Stock [Line Items]
Number of shares converted (in shares)											0	0	0	0
Leviston Resources LLC
Class of Stock [Line Items]
Conversion of convertible notes into common stock (in shares)												0		184,357
Conversion of convertible debt into common stock | $												$ 0		$ 700,000
Number of shares converted from debt instrument (in shares)												0		184,357
Conversion of debt into stock | $												$ 0		$ 700,000
Leviston Resources LLC | Settled Litigation
Class of Stock [Line Items]
Issuance of convertible notes | $																			$ 700,000
Lincoln Park [Member]
Class of Stock [Line Items]
New shares issued (in shares)	4,500,000				920,654	1,800,000	1,000,000	466,667	40,000
Value of shares issued | $									$ 10,000,000
Maximum percentage of shares issued									19.99%
Maximum number of shares issued									308,590
Beneficial Ownership Cap									4.99%
Shares sold in offering (in shares)		4,130,000									0		1,040,654		2,778,077	328,590
Issuance of common stock, net of issuance costs | $		$ 1,200,000											$ 1,400,000		$ 6,600,000	$ 1,400,000	$ 9,400,000
Share price (in dollars per share) | $ / shares									$ 7.05
Shares issued (in shares)											2,060,000		2,060,000				2,060,000	920,654
Minimum | Lincoln Park [Member]
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares				$ 1.50					$ 1.50
Maximum | Lincoln Park [Member]
Class of Stock [Line Items]
Value of shares issued | $									$ 1,000,000				$ 10,000,000
Shares sold in offering based on market price									36,666
Shares sold in offering (in shares)									30,000
LP 2020 Purchase Agreement [Member]
Class of Stock [Line Items]
Issuance of common stock, net of issuance costs | $													$ 6,700,000
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member]
Class of Stock [Line Items]
New shares issued (in shares)			1,770,000	250,000
Value of shares issued | $				$ 10,000,000
Maximum percentage of shares issued				19.99%
Maximum number of shares issued				1,774,024
Beneficial Ownership Cap										4.99%
Shares sold in offering (in shares)											2,060,000		3,580,000
Issuance of common stock, net of issuance costs | $											$ 4,300,000		$ 5,500,000
Share price (in dollars per share) | $ / shares				$ 0.7306
Number of business days prior to purchase date | D				10
LP 2020 Purchase Agreement [Member] | Minimum | Lincoln Park [Member]
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares				$ 1.00
LP 2020 Purchase Agreement [Member] | Maximum | Lincoln Park [Member]
Class of Stock [Line Items]
Value of shares issued | $				$ 1,000,000
Shares sold in offering based on market price				50,000
LP 2020 Purchase Agreement [Member] | Closing Sale Price Above 1.00 [Member] | Maximum
Class of Stock [Line Items]
Shares sold in offering based on market price				80,000
LP 2020 Purchase Agreement [Member] | Closing Sale Price Above 1.50 [Member] | Maximum | Lincoln Park [Member]
Class of Stock [Line Items]
Shares sold in offering based on market price				100,000

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