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RELATED PARTY TRANSACTIONS (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related party transactions      
Net sales $ 164,439,000 $ 186,728,000 $ 320,576,000
Gross profit 40,220,000 68,158,000 114,334,000
Softbank and affiliates
      
Related party transactions      
Net sales 90,302,000 92,011,000 94,201,000
Cost of net sales 59,052,000 51,448,000 33,790,000
Gross profit 31,250,000 40,563,000 60,411,000
Accounts receivable 19,000,000 12,100,000  
Accounts payable 0 0  
Service period of sales to related party 3 years    
Period over which product failure rates exceed a certain level under the penalty clause 7 years    
Customer advances 3,100,000 4,700,000  
Deferred revenue current 2,000,000 6,500,000  
Deferred revenue noncurrent 3,800,000 4,600,000  
Fair value of retained ownership interest after the repurchase 1,900,000    
Ownership interest held by related party (as a percent) 12.30% 10.20%  
Yellowstone
      
Related party transactions      
Number of directors of the entity who served as a director in related party 1    
Consulting services 0 1,800,000  
Amount paid for success fees     $ 900,000