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INCOME TAXES - Additional Information (Details)
$ in Thousands
 12 Months Ended
Oct. 11, 2014
Jan. 01, 2008
Dec. 31, 2024
USD ($)
Item
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
INCOME TAXES            
Dividend income distributed from subsidiary       $ 15,400    
Ending balance—gross unrecognized tax benefits (“UTB”s)     $ 3,244 3,244 $ 3,244  
Unrecognized tax benefits if recognized, would impact certain deferred tax assets     2,700     $ 2,700
Unrecognized tax benefits that would impact the annual effective tax rate if recognized     541 541 541  
Accrued interest and penalties     500 500    
Net operating loss carryforwards     547,000      
Change in deferred tax valuation allowance     (2,203) (2,369) 1,394  
Income tax benefit related to tax credits     0 $ 0 $ 0  
U.S Federal            
INCOME TAXES            
Net operating loss carryforwards     549,000      
Net operating loss carryforwards indefinitely     2,000      
Valuation allowance against the related deferred tax assets     1,900      
U.S Federal | Research and development credit carryforwards            
INCOME TAXES            
Tax credit carryforwards     1,200      
Tax Credit Carry Forward Amount Not Subject To Expiration     6,400      
Tax Credit Carry Forward Amount Subject To Expiration     1,200      
State            
INCOME TAXES            
Net operating loss carryforwards     228,000      
U.S Federal and State            
INCOME TAXES            
Valuation allowance against the related deferred tax assets     129,000      
Foreign            
INCOME TAXES            
Tax credit carryforwards     $ 5,000      
Earliest Tax Year | U.S Federal            
INCOME TAXES            
Operating loss carryforwards expiration year     2026      
Tax credit carryforward expiration year     2026      
Earliest Tax Year | U.S Federal | Research and development credit carryforwards            
INCOME TAXES            
Tax credit carryforward expiration year     2026      
Earliest Tax Year | State            
INCOME TAXES            
Operating loss carryforwards expiration year     2028      
Latest Tax Year | U.S Federal            
INCOME TAXES            
Operating loss carryforwards expiration year     2037      
Tax credit carryforward expiration year     2028      
Latest Tax Year | U.S Federal | Research and development credit carryforwards            
INCOME TAXES            
Tax credit carryforward expiration year     2028      
Latest Tax Year | State            
INCOME TAXES            
Operating loss carryforwards expiration year     2033      
CAYMAN ISLANDS            
INCOME TAXES            
Withholding tax     $ 0      
China            
INCOME TAXES            
Foreign statutory tax rate (as a percent)     25.00%      
Reduced tax rate for qualified high technology enterprises (as a percent)     15.00%      
China | U T Starcom Telecom Co Ltd            
INCOME TAXES            
Reduced tax rate for qualified high technology enterprises (as a percent) 15.00% 15.00%        
Number of subsidiaries approved for the reduced tax rate | Item     1      
Valid period for reduced income tax rate applicable to qualified high technology enterprise 3 years 3 years        
China | Foreign            
INCOME TAXES            
Net operating loss carryforwards     $ 128,000      
Net operating loss carryforwards expired     19,200      
Valuation allowance against the related deferred tax assets     $ 19,500      
China | Earliest Tax Year | Foreign            
INCOME TAXES            
Operating loss carryforwards expiration year     2025      
China | Latest Tax Year | Foreign            
INCOME TAXES            
Operating loss carryforwards expiration year     2034      
Countries other than the U.S. and China | Foreign            
INCOME TAXES            
Net operating loss carryforwards     $ 94,500      
Valuation allowance against the related deferred tax assets     15,800      
California | State | Research and development credit carryforwards            
INCOME TAXES            
Tax credit carryforwards     $ 6,400