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RELATED PARTY TRANSACTIONS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Related party transactions      
Net sales $ 186,728,000 $ 320,576,000 $ 291,535,000
Gross profit 68,158,000 114,334,000 70,238,000
Softbank and affiliates
      
Related party transactions      
Net sales 92,011,000 94,201,000 46,267,000
Cost of net sales 51,448,000 33,790,000 19,147,000
Gross profit 40,563,000 60,411,000 27,120,000
Amount by which gross profit as a percentage of net sales benefited     2,400,000
Accounts receivable 12,100,000 8,500,000  
Accounts payable 0 1,900,000  
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 4,700,000 2,600,000  
Deferred revenue current 6,500,000 15,800,000  
Deferred revenue noncurrent 4,600,000 7,200,000  
Investment in SBI 2,300,000    
Ownership interest held by related party (as a percent) 10.20% 9.70%  
Yellowstone
      
Related party transactions      
Number of directors of the entity who served as a director in related party 1    
Consulting services 1,800,000 200,000  
Amount paid for success fees   $ 900,000