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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 6 Months Ended
Jun. 30, 2014
Receivables [Abstract]  
Activity in Allowance for Doubtful Accounts Receivable and Sales Returns
Activity in the allowance for doubtful accounts receivable and sales returns (in thousands):
 
 
Allowance For
 
Doubtful
Accounts
Receivable
 
Sales
Returns
Balances, December 31, 2013
$
966

 
$
569

Addition (reduction) to allowance
341

 
(101
)
Amounts written off
(25
)
 
(4
)
Foreign currency translation
4

 
(1
)
Balances, June 30, 2014
$
1,286

 
$
463