STOCKHOLDERS' EQUITY - Narrative (Details)								3 Months Ended			6 Months Ended
	Jul. 02, 2021 shares	Mar. 08, 2021 USD ($) $ / shares shares	Feb. 05, 2021 shares	Aug. 03, 2020 USD ($) $ / shares shares	Feb. 11, 2020 USD ($) $ / shares shares	Jul. 19, 2019 USD ($) $ / shares shares	Jul. 18, 2019 trading_day shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2020 shares	Mar. 31, 2020 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jul. 01, 2021 $ / shares shares	Dec. 31, 2020	Dec. 11, 2020 $ / shares shares	Feb. 29, 2020 $ / shares shares
Class of Stock [Line Items]
Shares issued, value | $		$ 23,000,000.0		$ 6,200,000				$ 26,850,021		$ 9,467,166
Expected life (years)											3 years 6 months 21 days			4 years 21 days
Exercise price (in dollars per share) | $ / shares															$ 1.182
Number of shares called by warrants															3,964,065
Proceeds from warrants exercised for cash | $											$ 1,485,351	$ 578,714
Consecutive trading days | trading_day							10
Wedbush | Satisfy Success Fee
Class of Stock [Line Items]
Expected life (years)						5 years
Exercise price (in dollars per share) | $ / shares						$ 18.90
Number of shares called by warrants						42,928
Warrant value | $						$ 500,000
Due to related party | $						1,000,000.0
Cash payment to related party | $						$ 500,000
Subsequent Event
Class of Stock [Line Items]
Expected life (years)													5 years
Exercise price (in dollars per share) | $ / shares													$ 15.17
Number of shares called by warrants													142,711
Over-Allotment Option
Class of Stock [Line Items]
Shares issued, value | $					$ 11,000,000.0
Shares issued					1,252,173
Sales Agreement
Class of Stock [Line Items]
Shares issued, value | $											$ 6,300,000
Shares issued			6,300,000								2,820,493
Sales Agreement | Subsequent Event
Class of Stock [Line Items]
Shares issued	25,000,000.0
Minimum
Class of Stock [Line Items]
Exercise price (in dollars per share) | $ / shares															$ 0.90
Common Stock
Class of Stock [Line Items]
Shares issued, value | $								$ 1,963		$ 835
Shares issued		16,806,722		5,130,390	8,353,480			19,627,215		8,353,480
Price per share (usd per share) | $ / shares		$ 1.3685		$ 1.20
Number of rights per share							1
Number of shares called by warrants					9,599,999
Warrants exercised for cash (shares)								1,298,567	503,230		1,298,567
Warrants outstanding (shares)											7,747,587
Common Stock | Over-Allotment Option
Class of Stock [Line Items]
Expected life (years)					5 years											5 years
Number of rights per share					1											1
Exercise price (in dollars per share) | $ / shares					$ 1.15
Preferred Stock
Class of Stock [Line Items]
Shares issued, value | $										$ 125
Shares issued										1,246,519
Class A | Common Stock | Over-Allotment Option
Class of Stock [Line Items]
Number of shares issued					7,101,307
Price per share (usd per share) | $ / shares					$ 1.15
Exercise price (in dollars per share) | $ / shares																$ 1.15
Class B | Preferred Stock | Over-Allotment Option
Class of Stock [Line Items]
Number of shares issued					1,246,519
Price per share (usd per share) | $ / shares					$ 1.15
Series A Preferred | Preferred Stock
Class of Stock [Line Items]
Shares issued					1,246,519