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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - ESPP (Details) - shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for issuance (in shares) 100,500,000  
Employee Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for issuance (in shares) 1,000,000  
Shares issued under employee stock purchase plan (in shares) 23,418 28,621