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COMMON STOCK - Summary of Shares Issued and Outstanding (Details)
6 Months Ended
Jun. 30, 2021
shares
Common Stock [Roll Forward]  
Beginning balance (in shares) 100,591,940
New Issuances During the Period:  
ATM equity offering (in shares) 11,694,984
Stock-based compensation plan (in shares) 159,054
Ending balance (in shares) 112,445,978