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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts receivable, net of allowances
Accounts receivable, net of allowances, consisted of the following at December 31, 2018 and 2017 (in thousands):
 
December 31,
 
2018
 
2017
Accounts receivable
$
69,093

 
$
51,276

Less:
 
 
 
Allowance for doubtful accounts
(1,339
)
 
(1,226
)
Allowance for sales returns and rebates
—

 
(9,916
)
Total
$
67,754

 
$
40,134