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Product Warranty (Tables)
 12 Months Ended
Dec. 31, 2014
Product Warranties Disclosures [Abstract]  
Activity related to the product warranty liability
The following table summarizes the activity related to the product warranty liability (in thousands):
 
 
Balance at beginning of period
 
Cost of warranty claims
 
Accruals for product warranties
 
Foreign currency translation adjustment
 
Balance at
end of
period
December 31, 2012
 
$
1,126

 
$
(150
)
 
$
30

 
$
—

 
$
1,006

December 31, 2013
 
$
1,006

 
$
(321
)
 
$
(107
)
 
$
—

 
$
578

December 31, 2014
 
$
578

 
$
(17
)
 
$
55

 
$
—

 
$
616