CAPITAL STOCK - Narrative (Details)	1 Months Ended				3 Months Ended	9 Months Ended
	Jul. 31, 2021 USD ($) $ / shares shares	Oct. 31, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Feb. 29, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Apr. 19, 2021 shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 $ / shares shares	Apr. 30, 2020 USD ($)
Class of Stock [Line Items]
Common stock, par value (in usd per share) | $ / shares					$ 0.01	$ 0.01				$ 0.01
Common stock, shares authorized					300,000,000	300,000,000		300,000,000		100,000,000
Sale of stock, expiration term		5 years
Proceeds from the exercise of warrants | $						$ 8,969,000	$ 23,000
Common stock, shares issued					88,732,346	88,732,346				53,551,461
Aggregate purchase price for stock and warrants | $			$ 200,000
Sale of stock, percentage of commission						0.03
Sale of stock additional shares authorized amount | $					$ 26,900,000	$ 26,900,000
Preferred shares authorized					5,000,000	5,000,000
Temporary equity, par or stated value per share (in dollars per share) | $ / shares					$ 0.01	$ 0.01
Preferred stock shares outstanding					0	0
Common stock warrants
Class of Stock [Line Items]
Exercise price (in usd per share) | $ / shares					$ 0.72	$ 0.72
Lincoln Park
Class of Stock [Line Items]
Purchase obligation | $				$ 28,000,000
Purchase obligation, term				36 months
Maximum commitment purchase amount | $				$ 1,000,000
Percentage of ownership after transaction				9.99%
Pre-Funded Warrant
Class of Stock [Line Items]
Exercise price (in usd per share) | $ / shares		$ 0.001					$ 0.001
July 2021 Offering
Class of Stock [Line Items]
Number of shares issued in transaction	12,983,871
Closing sale price (in usd per share) | $ / shares	$ 0.62
Consideration received on transaction | $	$ 7,300,000
October 2020 Offering
Class of Stock [Line Items]
Consideration received on transaction | $		$ 13,700,000
Number of shares authorized to be repurchased		20,833,322
Exercise price (in usd per share) | $ / shares					$ 0.72	$ 0.72
Commissions discounts and other offering expenses | $		$ 1,300,000
Stock issuable upon warrants (in shares)					12,427,387	12,427,387
Proceeds from the exercise of warrants | $						$ 8,900,000
October 2020 Offering | Common Stock
Class of Stock [Line Items]
Number of shares issued in transaction		19,003,510
October 2020 Offering | Common stock warrants
Class of Stock [Line Items]
Closing sale price (in usd per share) | $ / shares		$ 0.72
Number of shares authorized to be repurchased		1,829,812
October 2020 Offering | Pre-Funded Warrant
Class of Stock [Line Items]
Closing sale price (in usd per share) | $ / shares		$ 0.719
Common Stock Public Offering
Class of Stock [Line Items]
Exercise price (in usd per share) | $ / shares			$ 1.25		$ 1.25	$ 1.25
Sale of stock, expiration term			5 years
Stock issuable upon warrants (in shares)					17,500	17,500
Proceeds from the exercise of warrants | $						$ 22,000
Common stock, shares issued			14,790,133
Net proceeds from common stock public offering | $			$ 18,700,000
Underwriting commissions, discounts, and other offering expenses | $			$ 1,400,000
Common Stock Public Offering | Pre-Funded Warrant
Class of Stock [Line Items]
Stock issuable upon warrants (in shares)			2,709,867
Public offering price (in usd per share) | $ / shares			$ 1.15
Common Stock Public Offering | Accompanying Common Warrant
Class of Stock [Line Items]
Stock issuable upon warrants (in shares)			17,500,000
Public offering price (in usd per share) | $ / shares			$ 1.149
2021 At Market Issuance Sales Agreement
Class of Stock [Line Items]
Consideration received on transaction | $						$ 3,800,000
Aggregate offering price | $									$ 50,000,000
Sale of stock, weighted average price per share (in usd per share) | $ / shares						$ 0.89
Sale of stock additional shares authorized amount | $					$ 46,000,000	$ 46,000,000
2021 At Market Issuance Sales Agreement | Pre-Funded Warrant
Class of Stock [Line Items]
Number of shares issued in transaction					486,352	4,449,828
Consideration received on transaction | $					$ 400,000
Sale of stock, weighted average price per share (in usd per share) | $ / shares					$ 0.86
2020 At Market Issuance Sales Agreement
Class of Stock [Line Items]
Consideration received on transaction | $						$ 1,600,000
Aggregate offering price | $											$ 8,000,000
Sale of stock, weighted average price per share (in usd per share) | $ / shares						$ 1.55
Sale of stock additional shares authorized amount | $					$ 2,600,000	$ 2,600,000
2020 At Market Issuance Sales Agreement | Common Stock
Class of Stock [Line Items]
Number of shares issued in transaction						1,089,048
Private Placement Offerings
Class of Stock [Line Items]
Common stock, shares issued				950,000
Aggregate gross purchase price | $				$ 2,000,000
Private Placement Offerings | Series A
Class of Stock [Line Items]
Exercise price (in usd per share) | $ / shares				$ 0.01
Stock issuable upon warrants (in shares)				606,420
Private Placement Offerings | Series B
Class of Stock [Line Items]
Exercise price (in usd per share) | $ / shares				$ 1.16
Stock issuable upon warrants (in shares)				1,556,420
Purchase Agreement | Lincoln Park
Class of Stock [Line Items]
Number of shares issued in transaction					500,000	1,300,000
Closing sale price (in usd per share) | $ / shares				$ 3.00
Consideration received on transaction | $					$ 400,000	$ 1,000,000
Sale of stock, weighted average price per share (in usd per share) | $ / shares					$ 0.81	$ 0.81
Maximum shares allowed to be purchased				100,000
Maximum share increase amount				125,000
Regular Purchase | Lincoln Park
Class of Stock [Line Items]
Closing sale price (in usd per share) | $ / shares				$ 5.00
Maximum share increase amount				150,000