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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Accounts receivable trade $ 61,197 $ 58,718
Allowances for ship and debit (42,794) (39,486)
Allowances for stock rotation and rebate (3,757) (1,700)
Allowances for doubtful accounts (904) (734)
Total $ 13,742 $ 16,798