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STOCKHOLDERS' EQUITY (DEFICIT) - Preferred Stock (Details) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Equity [Abstract]    
Preferred stock, shares authorized (in shares) 5,000,000.0 5,000,000
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0