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STOCKHOLDERS' EQUITY (DEFICIT) - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 01, 2019 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Nov. 05, 2020 | Jul. 25, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 8,191 |  | $ 10,437 | $ 27,555 | $ 24,582 |  |
Award vesting period (in months) |  |  |  |  | 3 years |  |  |
Class A Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Conversion of Special Warrants to Class A and Class B Shares (in shares) |  | 9,185 | [1] | 85,141 | 9,383 | 96,516 |  |
Class B Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Conversion of Special Warrants to Class A and Class B Shares (in shares) |  | 0 |  |  | 59 |  |  |
Special Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Special warrants, number of securities called by each warrant (in shares) | 1 |  |  |  |  |  |  |
Special warrants, exercise price per share (in dollars per share) | $ 0.001 |  |  |  |  |  |  |
Special warrants, conversion terms, ownership percentage of common stock (as a percent) | 4.99% |  |  |  |  |  |  |
Special warrants, conversion terms, ownership percentage of capital stock or voting interests (as a percent) | 22.50% |  |  |  |  |  |  |
FCC petitions for declaratory ruling, percentage of voting stock and equity owned by non-US individuals and entities (up to) |  |  |  |  |  |  |  | 25.00%
FCC petitions for declaratory ruling, foreign owned percentage permitted |  |  |  |  |  |  | 100.00% |
Awards Vesting Based On Service Conditions |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  | $ 36,500 |  |  | $ 36,500 |  |  |
Unrecognized compensation cost, weighted average period (in years) |  |  |  |  | 1 year 10 months 24 days |  |  |
Performance RSUs |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  | 2,288 |  | $ 2,044 | $ 6,520 | $ 3,544 |  |
Award vesting period (in months) |  |  |  |  | 50 months |  |  |
Unrecognized compensation cost |  | $ 22,300 |  |  | $ 22,300 |  |  |
Performance RSUs | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost, weighted average period (in years) |  |  |  |  | 3 years |  |  |
Performance RSUs | Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost, weighted average period (in years) |  |  |  |  | 50 months |  |  |
[1] | The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2023 or 2022.

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