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 |