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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2015
$
765

 
$
158

Addition (reduction) to allowance
(20
)
 
20

Amounts written off
(3
)
 
(3
)
Foreign currency translation
39

 
—

Balances, March 31, 2016
$
781

 
$
175