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INCOME TAXES - Additional Information (Details)
 12 Months Ended
Oct. 11, 2014
Jan. 01, 2008
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
INCOME TAXES          
Statutory tax rate (as a percent)     21.00% 21.00% 35.00%
Refundable alternative minimum tax credit carryovers       $ 1,000,000  
GILTI inclusion amount     $ 0    
GILTI income tax liabilities     0    
Ending balance—gross unrecognized tax benefits (“UTB”s)     15,507,000 17,496,000 $ 18,728,000
Unrecognized tax benefits if recognized, would impact certain deferred tax assets     15,000,000    
Unrecognized tax benefits that would impact the annual effective tax rate if recognized     540,000 829,000 2,061,000
Decrease in provision for income taxes due to reduction of gross unrecognized tax benefits     2,000,000    
Accrued interest and penalties     400,000 400,000  
Change in deferred tax valuation allowance     1,107,000 (1,679,000) 5,971,000
Income tax benefit related to tax credits     0 0 $ 0
U.S Federal          
INCOME TAXES          
Net operating loss carryforwards     562,000,000    
Valuation allowance against the related deferred tax assets     2,500,000    
U.S Federal | Research and development credit carryforwards          
INCOME TAXES          
Tax credit carryforwards     3,100,000    
Tax Credit Carry Forward Amount Not Subject To Expiration     2,500,000    
Tax Credit Carry Forward Amount Subject To Expiration     600,000    
State          
INCOME TAXES          
Net operating loss carryforwards     277,000,000    
U.S Federal and State          
INCOME TAXES          
Valuation allowance against the related deferred tax assets     134,600,000    
Foreign          
INCOME TAXES          
Tax credit carryforwards     5,600,000    
Tax Year 2018          
INCOME TAXES          
Alternative minimum tax credit carryovers refundable credits claimed       $ 500,000  
Tax Year 2019          
INCOME TAXES          
Alternative minimum tax credit carryovers refundable credits claimed     $ 500,000    
Earliest Tax Year | U.S Federal          
INCOME TAXES          
Operating loss carryforwards expiration year     2025    
Tax credit carryforward expiration year     2020    
Earliest Tax Year | U.S Federal | Research and development credit carryforwards          
INCOME TAXES          
Tax credit carryforward expiration year     2020    
Earliest Tax Year | State          
INCOME TAXES          
Operating loss carryforwards expiration year     2020    
Latest Tax Year | U.S Federal          
INCOME TAXES          
Operating loss carryforwards expiration year     2034    
Tax credit carryforward expiration year     2028    
Latest Tax Year | U.S Federal | Research and development credit carryforwards          
INCOME TAXES          
Tax credit carryforward expiration year     2023    
Latest Tax Year | State          
INCOME TAXES          
Operating loss carryforwards expiration year     2039    
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     $ 77,800,000    
Valuation allowance against the related deferred tax assets     $ 11,800,000    
China | Earliest Tax Year | Foreign          
INCOME TAXES          
Operating loss carryforwards expiration year     2024    
China | Latest Tax Year | Foreign          
INCOME TAXES          
Operating loss carryforwards expiration year     2029    
Countries other than the U.S. and China | Foreign          
INCOME TAXES          
Net operating loss carryforwards     $ 97,800,000    
Valuation allowance against the related deferred tax assets     $ 16,400,000