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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) shares | Feb. 08, 2018 shares | Sep. 30, 2020 USD ($) user shares | Sep. 30, 2019 USD ($) | Jan. 01, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Lease Obligation Incurred | $ |  |  | $ 0.4 | $ 0.1 |  |  |
Number of shares authorized (in shares) |  | 1,875,000 |  |  |  | 1,345,631 |
Number of shares remaining available for issuance (in shares) |  | 61,247 |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |
Expiration period |  |  | 10 years |  |  |  |
Options vested in period, fair value | $ |  |  | $ 1.9 |  |  |  |
Compensation not yet recognized | $ |  |  | $ 0.7 |  |  |  |
Common stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation cost not yet recognized |  |  | 6 months |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |
Granted (in shares) |  |  | 1,671,000 |  |  |  |
Unvested PSU (in shares) |  |  | 2,545,000 |  |  | 1,741,000 |
Compensation cost not yet recognized |  |  | 3 years 4 months 24 days |  |  |  |
Restricted stock units | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,170,517 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unvested PSU (in shares) |  |  | 1,252,500 |  |  |  |
Performance Shares [Member] | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSU, performance condition, period |  |  | 3 years |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user |  |  | 0.50 |  |  |  |
Performance Shares [Member] | Share-based Compensation Award, Tranche Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSU, performance condition, period |  |  | 5 years |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user |  |  | 0.25 |  |  |  |
Performance Shares [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Performance Conditions | user |  |  | 0.25 |  |  |  |
ESPP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized, annual increase |  |  |  |  |  |  | 1.00%
ESPP, purchase price percentage |  | 85.00% |  |  |  |  |
ESPP, number of shares authorized, annual increase (in shares) |  |  | 500,000 |  | 265,470,000 | 267,823,000 |
Employees and non-employee directors | Minimum | Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 1 year |  |  |  |
Employees and non-employee directors | Maximum | Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |
Subsequent Event | Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 63,100 |  |  |  |  |  |
Compensation not yet recognized, awards other than options | $ | $ 5.0 |  |  |  |  |  |

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