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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Schedule II - Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

(in thousands) 
 
Beginning Balance
  
Charged to costs and expenses
  
Deductions
  
Ending Balance
 
Year Ended December 31, 2017
            
Inventory allowance
 
$
3,535
  
$
8,846
  
$
(8,532
)
 
$
3,849
 
Prepaid expenses and other current assets allowance
  
4,868
   
466
   
-
   
5,334
 
                 
Year Ended December 31, 2016
                
Inventory allowance
 
$
1,637
  
$
9,950
  
$
(8,052
)
 
$
3,535
 
Prepaid expenses and other current assets allowance
  
1,981
   
2,887
   
-
   
4,868
 
                 
Year Ended December 31, 2015
                
Inventory allowance
 
$
1,314
  
$
6,258
  
$
(5,935
)
 
$
1,637
 
Prepaid expenses and other current assets allowance
  
1,885
   
96
   
-
   
1,981