STOCKHOLDERS' EQUITY - PUBLIC OFFERING (Details) - USD ($)		12 Months Ended
	May 27, 2020	Dec. 31, 2021	Dec. 31, 2020
Public Offering [Line Items]
Proceeds from exercise of warrants		$ 2,479,000	$ 16,000
Underwritten Public Offering
Public Offering [Line Items]
Issuance of common stock in connection with public offering	107,049,375
Net proceeds from public offering after deducting underwriting discount and other offering expenses	$ 140,184,000
Combined public offering price per share of common stock and accompanying stock purchase warrants	$ 1.30
Proceeds from exercise of warrants		$ 2,479,000	$ 16,000
Underwritten Public Offering | Stock Purchase Warrants
Public Offering [Line Items]
Warrants to purchase common stock, exercise price	$ 1.30
Warrants to purchase common stock, shares	57,692,307	55,773,466
Warrants to purchase common stock exercised, shares		1,906,341	12,500
Underwritten Public Offering | Pre-Funded Warrants
Public Offering [Line Items]
Warrants to purchase common stock, exercise price	$ 0.001
Warrants to purchase common stock, shares	8,335,239	8,335,239
Combined public offering price per share of pre-funded warrants and accompanying stock purchase warrants	$ 1.299