STOCKHOLDERS' EQUITY (DEFICIT) - Common Stock (Details) - shares	Mar. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	171,978,799	140,449,647
Common stock, shares outstanding (in shares)	171,978,799	140,449,647