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Product Warranty (Tables)
 3 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
The following table summarizes the change in product warranty liability during the three months ended March 31, 2015 (in thousands):

Balance at beginning of the period
$
616

Cost of warranty claims
(19
)
Accruals for product warranties
20

Balance at end of the period
$
617