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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation Narrative (Details)
9 Months Ended
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 4 years
Expected dividend yield 0.00%
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 3 years
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 4 years