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STOCKHOLDERS' DEFICIT - Narrative (Details)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Special Warrants  
Class of Stock [Line Items]  
Special warrants, number of securities called by each warrant (in shares) | shares 1
Special warrants, exercise price per share (in dollars per share) | $ / shares $ 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) 22.50%
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 | $ $ 17.6
Unrecognized compensation cost, weighted average period (in years) 1 year 7 months 6 days
Minimum  
Class of Stock [Line Items]  
Award vesting period (in months) 1 year
Maximum  
Class of Stock [Line Items]  
Award vesting period (in months) 3 years