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Product Warranty (Tables)
6 Months Ended
Jun. 30, 2014
Product Warranties Disclosures [Abstract]  
Summary of product warranty activity
The following table summarizes product warranty activity during 2014 and 2013:
 
 
Six Months Ended
 
June 30,
 
2014
 
2013
Beginning balance
$
1,269

 
$
814

Charges to expense
967

 
515

Costs incurred
(620
)
 
(359
)
Ending balance
$
1,616

 
$
970