COMMON STOCK, TRANSACTIONS (Details)		1 Months Ended							3 Months Ended		6 Months Ended
	May 30, 2018 USD ($) shares	Apr. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	May 31, 2018 shares	Jan. 31, 2018 USD ($)	Jun. 30, 2020 USD ($) Y $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) Y $ / shares shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 $ / shares
Common stock disclosures
Common stock, par value (in dollars per share) | $ / shares									$ 0.00001		$ 0.00001		$ 0.00001
Proceeds from issuance of common stock and warrants, net of issuance costs											$ 8,592,000
Proceeds from exercise of warrants											$ 343,000
Number of Warrants | shares									4,745,334		4,745,334
April 2020 Shares [Member]
Common stock disclosures
Number of shares issued (in shares) | shares		1,715,240
Equity issuance (in price per unit) | $ / shares		$ 1.75
Proceeds from issuance of common stock		$ 2,600,000
Expected volatility
Common stock disclosures
Fair value assumptions									115.22		115.22
Risk-free interest rate
Common stock disclosures
Fair value assumptions									0.63		0.63
Contractual term
Common stock disclosures
Fair value assumptions | Y									5		5
Expected dividend yield
Common stock disclosures
Fair value assumptions									0		0
401(k)
Common stock disclosures
Company contributions to employee 401(k) accounts									$ 16,000	$ 19,000	$ 35,000	$ 31,000
April 2020 Warrants
Common stock disclosures
Number of shares into which a warrant may be converted | shares		1,715,240
Exercise price (in dollars per unit) | $ / shares		$ 1.62
Fair value of warrants		$ 2,100,000
Proceeds from exercise of warrants									$ 57,000
Shares issued on exercise of warrants | shares									35,000
April 2020 Warrants | Expected volatility
Common stock disclosures
Fair value assumptions		115.84
April 2020 Warrants | Risk-free interest rate
Common stock disclosures
Fair value assumptions		0.40
April 2020 Warrants | Contractual term
Common stock disclosures
Fair value assumptions		5.5
April 2020 Warrants | Expected dividend yield
Common stock disclosures
Fair value assumptions		0
2018 Series A Warrant
Common stock disclosures
Exercise price (in dollars per unit) | $ / shares				$ 6.98					$ 6.98		$ 6.98
Number of Warrants | shares									211,921		211,921
Series B Warrants 2020 [Member]
Common stock disclosures
Exercise price (in dollars per unit) | $ / shares			$ 0.00001
Intrinsic value									$ 4,400,000		$ 4,400,000
Number of Warrants | shares			1,589,842
Shares issued on exercise of warrants | shares									560,577		1,577,114
Series A Warrants [Member]
Common stock disclosures
Exercise price (in dollars per unit) | $ / shares			$ 2.75
Fair value of warrants									$ 3,500,000		$ 3,500,000
Number of Warrants | shares			2,545,455
Wainwright 2020 Placement Agent Warrants [Member]
Common stock disclosures
Number of shares into which a warrant may be converted | shares		111,491
Exercise price (in dollars per unit) | $ / shares		$ 2.1875
Fair value of warrants		$ 128,000							218,000		218,000
Wainwright 2020 Placement Agent Warrants [Member] | Expected volatility
Common stock disclosures
Fair value assumptions		116.14
Wainwright 2020 Placement Agent Warrants [Member] | Risk-free interest rate
Common stock disclosures
Fair value assumptions		0.36
Wainwright 2020 Placement Agent Warrants [Member] | Contractual term
Common stock disclosures
Fair value assumptions		5
Wainwright 2020 Placement Agent Warrants [Member] | Expected dividend yield
Common stock disclosures
Fair value assumptions		0
Placement Agent Warrants
Common stock disclosures
Percentage of aggregate number of shares available			6.50%
Exercise price (in dollars per unit) | $ / shares			$ 3.4375
Fair value of warrants									$ 59,000		$ 59,000
Number of Warrants | shares			165,455
Placement Agent Warrants | Expected volatility
Common stock disclosures
Fair value assumptions									100.82		100.82
Placement Agent Warrants | Risk-free interest rate
Common stock disclosures
Fair value assumptions									1.61		1.61
Placement Agent Warrants | Contractual term
Common stock disclosures
Fair value assumptions | Y									5		5
Placement Agent Warrants | Expected dividend yield
Common stock disclosures
Fair value assumptions									0		0
Common Stock
Common stock disclosures
Number of shares issued (in shares) | shares									1,715,240		2,670,853
Common Stock | 401(k)
Common stock disclosures
Aggregate number of shares reserved for issuance | shares							137
Number of additional shares reserved | shares							134
Underwritten Public Offering, June 2018
Common stock disclosures
Proceeds from issuance of common stock and warrants, net of issuance costs						$ 13,500,000
Underwritten Public Offering, June 2018 | 2018 Series A Warrant
Common stock disclosures
Number of shares/warrants comprised in a unit (in shares) | shares						1
Warrant expiration term (in years)						5 years
Exercise price (in dollars per unit) | $ / shares						$ 60.00
Underwritten Public Offering, June 2018 | 2018 Series B Warrant Exercise price $.01
Common stock disclosures
Warrant expiration term (in years)						20 years
Exercise price (in dollars per unit) | $ / shares						$ 0.30
Number of Warrants | shares									0		0
Underwritten Public Offering, June 2018 | Common Stock
Common stock disclosures
Number of shares/warrants comprised in a unit (in shares) | shares						1
Number of shares of common stock to be purchased by each warrant | shares						1
Underwritten Public Offering, June 2018 | Common Stock And Warrants
Common stock disclosures
Number of shares issued (in shares) | shares						45,950
Equity issuance (in price per unit) | $ / shares						$ 60.00
Pre Funded Units
Common stock disclosures
Number of shares issued (in shares) | shares						208,096
Equity issuance (in price per unit) | $ / shares						$ 59.70
Pre Funded Units | 2018 Series A Warrant
Common stock disclosures
Number of shares/warrants comprised in a unit (in shares) | shares						1
Pre Funded Units | 2018 Series B Warrant Exercise price $.01
Common stock disclosures
Number of shares/warrants comprised in a unit (in shares) | shares						1
Pre Funded Units | Common Stock
Common stock disclosures
Number of shares of common stock to be purchased by each warrant | shares						1
Underwritten public offering during November, 2019.
Common stock disclosures
Number of shares issued (in shares) | shares				233,341
Equity issuance (in price per unit) | $ / shares				$ 3.60
Proceeds from issuance of common stock and warrants, net of issuance costs				$ 367,000
Underwritten public offering during November, 2019. | Placement Agent Warrants
Common stock disclosures
Exercise price (in dollars per unit) | $ / shares				$ 4.50
Number of Warrants | shares				15,168
Underwritten Public Offering March 2020 [Member]
Common stock disclosures
Number of shares issued (in shares) | shares			955,613
Underwritten Public Offering March 2020 [Member] | Series B Warrants 2020 [Member]
Common stock disclosures
Equity issuance (in price per unit) | $ / shares			$ 2.74999
Underwritten Public Offering March 2020 [Member] | Common Stock
Common stock disclosures
Equity issuance (in price per unit) | $ / shares			$ 2.75
Purchase and registration rights agreement | Common Stock
Common stock disclosures
Number of shares issued (in shares) | shares	574											0
Aggregate proceeds could be received								$ 15,000,000
Term								24 months
Deferred offering costs	$ 627,000
Purchase and registration rights agreement | Common Stock | Maximum
Common stock disclosures
Aggregate number of shares reserved for issuance | shares	40,000
Wainwright 2020 Placement Agent Warrants [Member]
Common stock disclosures
Percentage of warrants issued as a percentage of the warrants issued to the investors		6.50%
Proceeds from issuance of common stock and warrants, net of issuance costs			$ 6,000,000
Ladenburg Warrant Amendment [Member]
Common stock disclosures
Fair value adjustment of warrants					$ 764,000
Warrant reclassified to equity					$ 14,700,000
Ladenburg Warrant Amendment [Member] | 2018 Series B Warrant Exercise price $.01
Common stock disclosures
Shares issued on exercise of warrants | shares											0
Ladenburg Warrant Amendment [Member] | Series A Warrants [Member]
Common stock disclosures
Fair value adjustment of warrants				$ 666,000
Proceeds from exercise of warrants											$ 286,000
Shares issued on exercise of warrants | shares									0	0	40,975	0