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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Aug. 31, 2012
Dec. 31, 2011
Revenue Recognition            
Current deferred revenue $ 10,779 $ 16,965        
Long-term deferred revenue 3,813 8,554        
Disposed of by sale, not discontinued operations | IPTV divestiture            
Revenue Recognition            
Deferred revenue         $ 10,000  
Gross profit impact from future revenue recognition of unassigned contracts 0          
Revenues relating to un-assigned contracts 300 $ 3,600 $ 4,300      
Liabilities related to un-assigned contracts 10,200       47,300  
Deferred costs related to un-assigned contracts $ 10,200       47,300  
PAS Infrastructure Contracts            
Revenue Recognition            
Deferred revenue           $ 13,200
Deferred revenue released       $ 8,100    
PAS Infrastructure Contracts | Disposed of by sale, not discontinued operations | IPTV divestiture            
Revenue Recognition            
Deferred revenue of disposal group         $ 5,100