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STOCKHOLDER'S EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | May 09, 2022 | Mar. 28, 2022 | May 01, 2019 | Aug. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Nov. 05, 2020 | Jul. 25, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 10,437 |  | $ 5,993 | $ 24,582 |  | $ 17,581 |  |  |  |
Common stock, shares authorized (in shares) | 2,100,000,000 |  |  |  |  | 2,100,000,000 |  |  | 2,100,000,000 |  |  |  |  |  |
Class A Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,000,000,000 |  |  |  |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  | 1,000,000,000 |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  | $ 0.001 |  |
Conversion of Special Warrants to Class A and Class B Shares (in shares) |  |  |  |  |  | 85,141 | [1] | 60,698 | 96,516 | [2] | 47,197,139 | [3] |  |  |
Class B Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,000,000,000 |  |  |  |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  | 1,000,000,000 |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  | $ 0.001 |  |
Conversion of Class B Shares to Class A Shares (in shares) |  |  |  |  |  | 9,218 |  | 1,130,851 | 207,438 |  | 6,718,576 |  |  |  |
Conversion of Special Warrants to Class A and Class B Shares (in shares) |  |  |  |  |  |  |  |  |  |  | 22,337,312 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,000,000 |  |  |  |  | 100,000,000 |  |  | 100,000,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  |  |  |
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% |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 400 |  |  | $ 1,400 |  |  |  |
Award vesting period (in months) |  |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |
Q1 2022 Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 800 |  |  | $ 1,500 |  |  |  |  |  |
Award vesting period (in months) |  |  | 50 months |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 11,000 |  |  |  |  | 11,000 |  |  | 11,000 |  |  |  |  |  |
Unrecognized compensation cost, weighted average period (in years) | 50 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Q2 2022 Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | 1,300 |  |  | 2,000 |  |  |  |  |  |
Unrecognized compensation cost | $ 13,400 |  |  |  |  | 13,400 |  |  | 13,400 |  |  |  |  |  |
Unrecognized compensation cost, weighted average period (in years) | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Awards Vesting Based On Service Conditions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 54,300 |  |  |  |  | $ 54,300 |  |  | $ 54,300 |  |  |  |  |  |
Unrecognized compensation cost, weighted average period (in years) |  |  |  |  |  |  |  |  | 3 years 4 months 24 days |  |  |  |  |  |
[1] | The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2022.
[2] | The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2022 or 2021.
[3] | The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2021 or 2020.

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