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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2012
$
1,010

 
$
653

Addition (reduction) to allowance
210

 
(47
)
Amounts written off
(61
)
 
(21
)
Foreign currency translation
20

 
—

Balances, September 30, 2013
$
1,179

 
$
585