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DISPOSITION OF THE CORE BUSINESS DISPOSITION OF THE CORE BUSINESS - CASH CONSIDERATION AND FAIR VALUE OF ASSETS DISPOSED (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross consideration from the sale of the Core Business $ 97,000 $ 91,095 $ 0 $ 0
Closing and transaction costs 5,905      
Net proceeds from sale of the Core Business before taxes 91,095      
Non-cash commitment to provide inventory 2,305      
Core business disposition, current assets        
Inventories, net 2,195 0 2,252  
Prepaid expenses and other current assets 57      
Total current assets 2,252 0 2,315  
Property and equipment, net of depreciation 375 0 375  
Non-current assets of discontinued operations 1,997 0 1,997  
Total assets 4,249      
Net gain on sale of the Core Business before taxes 84,541      
Income tax expense, gain on disposal of the Core business 16,137      
Gain on sale of the Core Business, net of tax 68,404 $ 68,404 $ 0 $ 0
Purchased technology and license rights, net of depreciation        
Core business disposition, current assets        
Intangible assets 112      
Brand name and trademark        
Core business disposition, current assets        
Intangible assets $ 1,510